SysAdminGear

Login to your server as root and you can use this command to turn on bind query logs:
# rndc querylog

To check if querylog is now On you can use this command:
# rndc status

You can list the packages that are installed on a RedHat or CentOS system, running one of this commands:

# rpm -aq
# yum list installed

You should remove packages you dont use for security reasons..

Windows XP SP3 pre-release comes with the "Windows vista SP1 update hack" again. So this should improve stability and OS preformance but you have to considere the hack..

You can Download Windows XP SP3 hack. After that, extract, execute the file and update your Windows XP, is should run fine now.

Funny :)

Office Platoon



Punish Your Microsoft Developer: Share the pain. THE PAIN! PAIN!!!!!!


The First Recorder IT Professional Seen at Work

You can check this on: /proc/PID/cwd directory or you can use pwdx command to report the current working directory of a process or processes.

Using pwdx:
# pwdx 1234

Output:
1234: /folder/

Usign /proc/PID/cwd:
# nano /proc/1234/cwd

This is a good way to check if someone is running processes on hiden folders.




SSHMenu Features:
- Allows to add key so that you can run rest of the all session without a problem and password.
- Every connection will use the terminal profile you’ve selected, to set the color scheme, terminal font and other settings.
- Open all connection at a time

What is SSHMenu?
"SSHMenu is a GNOME panel applet* that keeps all your regular SSH connections within a single mouse click (...) Each menu option will open an SSH session in a new terminal window. You can organise groups of hosts with separator bars or sub-menus. You can even open all the connections on a submenu (in separate windows or tabs) with one click.
Here's a killer feature: imagine if every time you connected to a production server the terminal window had a red-tinted background, to remind you to tread carefully. Using terminal profiles, SSHMenu allows you to specify colours, fonts, transparency and a variety of other settings on a per-connection basis. You can even set window size and position."
Via: SSHMENU

Download SSHMenu

This programs will search-and-destroy the rootkits that may be hiding in your Windows PC/Server. Check this list of free Rootkit Detectors for Windows:

Rootkit Unhooker
Web: www.rku.xell.ru/?l=e.mspx
Price: Free
Summary: Summary: A Russian-authored tool that's the most comprehensive and powerful of those tested here.

F-Secure BlackLight
Web: www.f-secure.com
Price: Free
Summary: A time-limited program that may soon be discontinued and folded into F-Secure Internet Security 2006, BlackLight nonetheless scans carefully and attempts to clean offending files from the system.

IceSword
Web: www.blogcn.com/user17/pjf/index.html
Price: Free
Summary: Summary: A bit difficult to find due to its authorship, but a remarkably thorough and continually updated tool with some excellent pro-level features.

RKDetector
Web: www.rkdetector.com
Price: Free
Summary: Composed of two separate applications that scan the file system and running processes, respectively, RKDetector suffers from not having the flexibility and breadth of features of the other programs here.

Trend Micro RootkitBuster
Web: www.trendmicro.com
Price: Free
Summary: A spin-off / standalone version of the rootkit scanning technology from one of Trend Micro's commercial programs, which actually works quite well on its own.

RootkitRevealer
Web: www.microsoft.com/technet/sysinternals/utilities/RootkitRevealer.mspx
Price: Free
Summary: Summary: One of the first rootkit detectors, it's now overshadowed a bit by some of the other programs here but can still do some decent work.

Font

Intalling CSF:
# wget http://www.configserver.com/free/csf.tgz
# tar zxf csf.tgz
# cd csf
# sh install.sh
Note: If you are running APF you should disable it. You can do it with this script (inclued on csf.tgz):
# sh disable_apf_bfd.sh

You can modify config option directly on WHM or if you prefer edit /etc/csf/:
# nano /etc/csf

CSF includes:

• Straight-forward SPI iptables firewall script
• Daemon process that checks for login authentication failures for:
  • courier imap and pop3
  • ssh
  • non-ssl cpanel / whm / webmail (cPanel servers only)
  • pure-pftd
  • password protected web pages (htpasswd)
  • mod_security failures
• POP3/IMAP login tracking to enforce logins per hour
• SSH login notification
• SU login notification
• Excessive connection blocking
• WHM configuration interface (cPanel servers only) or through Webmin
• WHM iptables report log (cPanel servers only)
• Easy upgrade between versions from within WHM (cPanel servers only) or through Webmin
• Easy upgrade between versions from shell
• A standard Webmin Module to configure csf is included in the distribution ready to install into Webmin - csfwebmin.tgz
• Pre-configured to work on a cPanel server with all the standard cPanel ports open (cPanel servers only)
• Auto-configures the SSH port if it's non-standard on installation
• Block traffic on unused server IP addresses - helps reduce the risk to your server
• Alert when end-user scripts sending excessive emails per hour - for identifying spamming scripts
• Suspicious process reporting - reports potential exploits running on the server
• Excessive user processes reporting
• Excessive user process usage reporting and optional termination
• Suspicious file reporting - reports potential exploit files in /tmp and similar directories
• Directory and file watching - reports if a watched directory or a file changes
• Block traffic on the DShield Block List and the Spamhaus DROP List
• Pre-configured settings for Low, Medium or High firewall security (cPanel servers only)
• Works with multiple ethernet devices
• Server Security Check - Performs a basic security and settings check on the server (cPanel servers only)
• Allow Dynamic DNS IP addresses - always allow your IP address even if it changes whenever you connect to the internet
• Alert sent if server load average remains high for a specified length of time
• mod_security log reporting (if installed)
• Email relay tracking - tracks all email sent through the server and issues alerts for excessive usage (cPanel servers only)
• IDS (Intrusion Detection System) - the last line of detection alerts you to changes to system and application binaries

Supported and Tested Operating Systems
- RedHat v7.3, v8.0, v9.0
- openSUSE v10
- RedHat Enterprise v3, v4, v5 Debian v3.1 (sarge)
- CentOS v3, v4, v5 Unbuntu v6.06 LTS
- Fedora Core v1, v2, v3, v4, v5, v6
- Tested on cPanel (except FCv6)

Google provide this service for free, you can use Gmail with your domain. It is great, you can get a very good e-mail service using your domain...

Free package includes the next Applications:
Gmail, Google Talk, Google Calendar, Google Docs, Page Creator and Start Page etc.
- Great uptime rate for email
- Big Email storage Space
- Conference room and resource scheduling
- No preset user account limit
- Mobile access
- Administrator control panel
- IMAP for Gmail

For more information consult Google Apps

Are your cPanel users getting this error when try to run some command using ssh in their jailshell?

Hi, I found this reference information. Good for people who wants to get rich knowlege about sysadmin.. (Part 6)

Read:
Part1 - Basics, important sites, HOWTO's, handbooks, hardening, tips
Part2 - Netfilter, firewall, Iptables, Ipchains, DoS, DDoS
Part3 - Intrusion detection, integrity checks: IDS, NIDS, HIDS, Antivirus, software
Part4 - Chroot, chrooting, jailing, comparimization
Part5 - Forensics, recovery, undelete
Part6 - Securing networked services

(Part 6) - Securing networked services

Apache
Web Security Appliance With Apache and mod_security (SF): http://www.securityfocus.com/infocus/1739
Securing Apache Step-by-Step: http://www.securityfocus.com/infocus/1694
Securing apache2: http://www.securityfocus.com/infocus/1786

Suexec
Apache suEXEC Support: http://httpd.apache.org/docs/1.3/suexec.html
HOWTO Install PHP with SuExec: http://gentoo-wiki.com/HOWTO_Install_PHP_with_SuExec
HOWTO Install PHP as CGI with Apache's suEXEC Feature: http://archiv.debianhowto.de/en/php_cgi/c_php_cgi.html
How to set up suexec to work with virtual hosts and PHP (+PHP +public_html patch): http://alain.knaff.lu/howto/PhpSuexec/

Apache modules
Apache mod_security guide: http://www.securityfocus.com/infocus/1739
Secure Your Apache With mod_security: http://www.howtoforge.com/book/print/1375
Apache mod_ssl: http://www.securityfocus.com/infocus/1356
mod_dosevasive: http://www.nuclearelephant.com/projects/dosevasive/
mod_security: http://www.modsecurity.org
mod_security rulesets: http://www.gotroot.com/mod_security+rules
mod_security rule generator: http://leavesrustle.com/tools/modsecurity/

MySQL
Securing MySQL Step-byStep: http://www.securityfocus.com/infocus/1726
Secure MySQL Database Design: http://www.securityfocus.com/infocus/1667
Database Security Explained: http://www.linuxexposed.com/content/view/181/54/
SQL injection attack mitigation: SafeSQL: http://www.phpinsider.com/php/code/SafeSQL/, http://www.webmasterbase.com/article/794
Detect SQL injection attacks: class_sql_inject: http://www.phpclasses.org/browse/package/1341.html

PHP
PHP and the OWASP Top Ten Security Vulnerabilities: http://www.sklar.com/page/article/owasp-top-ten
Top 7 PHP Security Blunders: http://www.sitepoint.com/print/php-security-blunders
PHP Security Guide: http://phpsec.org/projects/guide/ (PHP Security Library: http://phpsec.org/library/)
PHPsec.org Security Guide considered harmful: http://www.hardened-php.net/php_secu...armful.51.html
PHP: Preventing register_global problems: http://www.modsecurity.org/documenta...r-globals.html
Securing PHP Step-by-Step: http://www.securityfocus.com/infocus/1706
PHP Security: http://www.onlamp.com/pub/a/php/2003...undations.html
Security of PHP: http://www.developer.com/lang/article.php/918141 (PHP Foundations: http://www.onlamp.com/pub/ct/29)
Auditing PHP, Part 1: Understanding register_globals: http://www-128.ibm.com/developerworks/library/os-php1/
Hardened PHP: http://www.hardened-php.net
SuPHP: http://www.suphp.org/Home.html
(http://www.phpsecure.info seems outdated)

Checking PHP
phpcksec: http://tools.desire.ch/phpcksec/
CastleCops Analyzer (Nuke only?): http://nukecops.com/

Exploiting Common Vulnerabilities in PHP Applications
http://www.securereality.com.au/studyinscarlet.txt

Security network testing
Nessus: http://www.nessus.org/
Metasploit Framework: http://metasploit.com/projects/Framework/index.html

Application security testing
Open Web Application Security Project (OWASP): http://www.owasp.org/index.php/OWASP...le_of_Contents

Oracle
OScanner: http://www.cqure.net/wp/?page_id=3
OAT (Oracle Auditing Tools): http://www.cqure.net/wp/?page_id=2

Samba
SMBAudit (auditing): http://smbdaudit.sourceforge.net/

BIND
Secure BIND Template Version 5.1 05 JAN 2006: http://www.cymru.com/Documents/secur...-template.html
Securing an Internet Name Server: http://www.securiteam.com/securitynews/5VP0N0U5FU.html
DNS Security and Vulnerabilities: http://www.l0t3k.org/security/docs/dns/

SSH
General remarks:
Do not allow root account logins with ssh
Do use public key authentication
Restrict access if possible sshd_config: AllowGroups,AllowUsers and/or TCP wrappers, firewall, Xinetd entry, PAM ACL.
Stop bruteforcing (in no particular order):
Samhain: Defending against brute force ssh attacks: http://la-samhna.de/library/brutessh.html
Sshblack: http://www.pettingers.org/code/SSHBlack.html
Ssh_access: http://www.undersea.net/seanm/softwa...-access.tar.gz
Sshd_check: http://cerberus.cc/open/scripts/sshd_check.sh
Authfail: http://www.bmk.bz/?p=33
Denyhosts: http://denyhosts.sourceforge.net/
Sshdfilter: http://www.csc.liv.ac.uk/~greg/sshdfilter/
PAM_abl: http://www.hexten.net/sw/pam_abl/index.mhtml
Fail2ban: http://fail2ban.sourceforge.net/
Blockhosts: http://www.aczoom.com/cms/blockhosts/

Original Source: Linuxquestions.org

Hi, I found this reference information. Good for people who wants to get rich knowlege about sysadmin.. (Part 5)

Read:
Part1 - Basics, important sites, HOWTO's, handbooks, hardening, tips
Part2 - Netfilter, firewall, Iptables, Ipchains, DoS, DDoS
Part3 - Intrusion detection, integrity checks: IDS, NIDS, HIDS, Antivirus, software
Part4 - Chroot, chrooting, jailing, comparimization
Part5 - Forensics, recovery, undelete
Part6 - Securing networked services

Part5 - Forensics, recovery, undelete

Forensics HOWTO's, docs
Steps for Recovering from a UNIX or NT System Compromise: http://www.cert.org/tech_tips/root_compromise.html
Open Web Application Security Project (OWASP): http://www.owasp.org/
Open Source Computer Forensics Manual: http://sourceforge.net/project/showf...ease_id=171701
OSSTM: Institute for Security and Open Methodologies (formerly ideahamster.org): http://www.isecom.org/projects/osstmm.htm
Forensics Basic Steps: http://staff.washington.edu/dittrich/misc/forensics/ or http://staff.washington.edu/dittrich...forensics.html
Dd and netcat cloning disks: http://www.rajeevnet.com/hacks_hints...s_cloning.html
Security Applications of Bootable Linux CD-ROMs: http://rr.sans.org/linux/sec_apps.php
Honeypot project (Hone your skills with the SOM): http://project.honeynet.org/scans/
RH8.0: Chapter 11. Incident Response (Red Hat Linux Security Guide): http://www.redhat.com/docs/manuals/l...se-invest.html
Forensics and Incident Response Resources: http://is-it-true.org/pt/ptips8.shtml
Forensics presentation by Weld Pond and Tan: http://www.cs.neu.edu/groups/acm/lectures/Forensics_NU/
Law Enforcement and Forensics Links.: http://www.computerforensics.net/links.htm
Forensics commercial svc's: http://forensic.to/links/pages/Foren...Investigation/

Forensics CDR's
FIRE (formerly Biatchux +TCT): http://biatchux.dmzs.com/?section=main
The Penguin Sleuth Kit (Knoppix-based +TCT + Sleuthkit): http://luge.cc.emory.edu/psl.html
Knoppix

Forensics tools
OSSTM Tools listing: http://www.isecom.org/projects/operationaltools.htm
The Coroners Toolkit (TCT): http://www.porcupine.org/forensics/ or http://www.fish.com/forensics/
tomsrtbt (1 floppy distro): http://www.toms.net/rb/
Trinux, (Pentest/sniff/scan/recovery/IDS/forensics CD): http://www.trinux.org/
Snarl (Forensics CD based on FreeBSD): http://snarl.eecue.com
Freeware Forensics Tools for Unix: http://online.securityfocus.com/infocus/1503
The @stake Sleuth Kit (TASK): http://sleuthkit.sourceforge.net/
Tools used by CSIRTs to Collect Incident Data/Evidence, Investigate and Track Incidents (list): http://www.uazone.org/demch/analysis/sec-inchtools.html
Freeware Forensics Tools (reflist, Linux w32).: http://www.theiia.org/itaudit/index....=forum&fid=325
TUCOFS - The Ultimate Collection of Forensic Software, : http://www.tucofs.com/tucofs/tucofs.asp?mode=mainmenu
Response kits (precompiled static binaries for Linux, Slowaris and wintendo): http://www.incident-response.org/irtoolkits.htm
Precompiled static binaries for Linux (iso): http://www.stearns.org/staticiso/
Forensic Acquisition Utilities for w32: http://users.erols.com/gmgarner/forensics/
CREED (Cisco Router Evidence Extraction Disk),: http://cybercrime.kennesaw.edu/creed/
...else check Zone-h.org, Packetstorm, Wiretapped.net, whatever.

Undelete HOWTO's
Recovering a Lost Partition Table: http://tsaling.home.attbi.com/linux/lost_partition.html
Linux Partition HOWTO: http://surfer.nmr.mgh.harvard.edu/pa...Partition.html
How to recover lost partitions: http://cvs.sslug.dk/hdmaint/hdm_rescue.html
Linux Ext2fs Undeletion mini-HOWTO: http://www.linuxdoc.org/HOWTO/mini/E...ndeletion.html
Linux Partition Rescue mini-HOWTO: http://www.linux-france.org/article/...ini-HOWTO.html
File Recovery.v.0.81 (using Midnight Commander): http://www.ists.dartmouth.edu/text/I...very.v0.81.php

Rescue tools for partition table/ext2fs
Gpart: http://www.stud.uni-hannover.de/user/76201/gpart/
Testdisk: http://www.cgsecurity.org/index.html
Parted: http://www.gnu.org/software/parted/parted.html
Recover (app + info): http://recover.sourceforge.net/linux/recover/
R-Linux: http://www.r-tt.com/RLinux.shtml
Unrm: http://www.securiteam.com/tools/Unrm...for_Linux.html
Dd-rescue: http://www.garloff.de/kurt/linux/ddrescue/
Also see mc (the Midnight Commander)
TCT (above).

Rescue tools from dd image
Foremost: http://sourceforge.net/projects/foremost/

Rescue tools for FAT/VFAT/FAT32 from Linux
Fatback: http://sourceforge.net/projects/biatchux/

Partition imaging
: http://www.partimage.orgPartimage.
* For more rescue tools check Freshmeat.net, metalab.unc.edu or other depots for a /Linux/system/recovery/ dir.

II. Runefs: The first inode that can allocate block resources on a ext2 file system is in fact the bad blocks inode (inode 1) -- *not* the root inode (inode 2). Because of this mis-implementation of the ext2fs it is possible to store data on blocks allocated to the bad blocks inode and have it hidden from an analyst using TCT or TASK. To illustrate the severity of this attack the following examples demonstrate using the accompanying runefs toolkit to: create hidden storage space; copy data to and from this area, and show how this area remains secure from a forensic analyst.: http://www.phrack.org/show.php?p=59&a=6

Original Source: Linuxquestions.org

Hi, I found this reference information. Good for people who wants to get rich knowlege about sysadmin.. (Part 4)

Read:
Part1 - Basics, important sites, HOWTO's, handbooks, hardening, tips
Part2 - Netfilter, firewall, Iptables, Ipchains, DoS, DDoS
Part3 - Intrusion detection, integrity checks: IDS, NIDS, HIDS, Antivirus, software
Part4 - Chroot, chrooting, jailing, comparimization
Part5 - Forensics, recovery, undelete
Part6 - Securing networked services

Part4 - Chroot, chrooting, jailing, comparimization

Chroot Jails Made Easy with the Jail Chroot Project: http://www.linuxorbit.com/modules.ph...page&artid=538
Chrooting MySQL HOWTO (LQ): http://www.linuxquestions.org/questi...threadid=34338
and http://www.linuxquestions.org/questi...661#post206661
Apache, PHP, MySQL: http://www.faqts.com/knowledge_base/...aid/290/fid/31
SendMail: http://www.sendmail.net/000705securitygeneral.shtml
SendMail: http://www.linuxjournal.com/article.php?sid=5753
Snort: http://www.norz.org/software/snortstart.html

OpenSSH for chrooted sessions on Linux: http://mail.incredimail.com/howto/openssh/
http://chrootssh.sourceforge.net
OpenSSH, Scponly: http://www.sublimation.org/scponly/
Using scponly for secure file transfers: http://www.sancho2k.net/filemgmt_dat...s/scponly.html
OpenSSH, Rssh: http://pizzashack.org/rssh/
OpenSSH Sftp logging patch, contact Mike Martinez: mmartinez@reeusda.gov

How to chroot an Apache tree with Linux and Solaris: http://penguin.epfl.ch/chroot.html
An Overview of 'chroot jailing' Services in Linux: http://www.incidents.org/protect/borland.php
How to break out of a chroot() jail: http://www.bpfh.net/simes/computing/chroot-break.html
Breaking out of a restricted shell: http://online.securityfocus.com/infocus/1575, down at "Breaking Out of Various Restrictions"
Tech-Babble: Virtual Server Myth: http://www.pair.com/pair/current/ins...ualserver.html
0x05: Why chroot(2) Sucks: http://packetstormsecurity.nl/mag/napalm/napalm-12.txt
Chuvakin A.,: http://www.linuxsecurity.com/feature..._story-99.html
Chrooting daemons and system processes HOW-TO: http://www.networkdweebs.com/chroot.html

Other SW/HOWTO's unsorted
http://www.gsyc.inf.uc3m.es/~assman/jail
http://www.opensourcedirectory.org/projects/jailchootp/
http://people.debian.org/~pzn/howto/chroot-bind.sh.txt
http://www.linuxdocs.org/HOWTOs/Chroot-BIND-HOWTO.html
http://www.linuxdoc.org/HOWTO/Chroot-BIND8-HOWTO.html
http://www.linuxsecurity.com/docs/HO...D-HOWTO-4.html
http://www.enteract.com/~robt/Docs/A...l-freebsd.html for BIND
http://hoohoo.ncsa.uiuc.edu/docs/tut...t-example.html
http://penguin.epfl.ch/chroot.html
http://tjw.org/chroot-login-HOWTO/
http://www.ssh.com/products/ssh/admi...hrootmgr_.html
http://rr.sans.org/linux/daemons.php
http://www.defcon1.org/html/Security...t-enforce.html
http://www.gnumonks.org/ftp/pub/netf...oot-howto.html
http://www.sunbeam.franken.de/projec...oot-howto.html
http://www.mlug.ca/sklav/stories/November_issue2001
http://www.floc.net/makejail/
http://www.balabit.hu/downloads/jailer

Original Source: Linuxquestions.org

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Hi, I found this reference information for people who wants to get rich knowlege about sysadmin.. (Part 2)

Part1 - Basics, important sites, HOWTO's, handbooks, hardening, tips
Part2 - Netfilter, firewall, Iptables, Ipchains, DoS, DDoS
Part3 - Intrusion detection, integrity checks: IDS, NIDS, HIDS, Antivirus, software
Part4 - Chroot, chrooting, jailing, comparimization
Part5 - Forensics, recovery, undelete
Part6 - Securing networked services

Part2 - Netfilter, firewall, Iptables, Ipchains, DoS, DDoS

*Please note the easiest way to troubleshoot Netfilter related problems is to add log (target) rules before any "decision" in a chain.
** Please note there's a LOT of firewall scripts on LQ: just search the Linux - Security and Linux - networking fora please.

Netfilter/Iptables
LQ search, iptables+howto: http://www.linuxquestions.org/questi...der=descending
IPTables Tutorial: http://iptables-tutorial.frozentux.n...-tutorial.html
IPSysctl Tutorial: http://ipsysctl-tutorial.frozentux.n...-tutorial.html
Linuxguruz.org: http://www.linuxguruz.org/iptables/
Netfilter.org Packetfiltering HOWTO: http://www.netfilter.org/unreliable-...ltering-HOWTO/
Linuxsecurity.com Iptables tutorial: http://www.linuxsecurity.com/resourc...-tutorial.html
Iptables Connection tracking: http://www.cs.princeton.edu/~jns/sec...conntrack.html
Taking care of the New-not-SYN vulnerability: http://archives.neohapsis.com/archiv...3-01/0036.html

Ipchains
TLDP Ipchains HOWTO: http://www.linuxdoc.org/HOWTO/IPCHAINS-HOWTO.html
Flounder.net Ipchains HOWTO: http://www.flounder.net/ipchains/ipchains-howto.html

Web-browsers, mail clients, FTP clients, IM, P2P ports database for building your own rules: http://www.pcflank.com/fw_rules_db.htm

Other resources/misc stuff
Basic introduction to building ipchains rules: www.linuxdoc.org/HOWTO/IPCHAINS-HOWTO.html
Explanation of the Ipchains logformat: logi.cc/linux/ipchains-log-format.php3
Ipchains log decoder: dsl081-056-052.dsl-isp.net/dmn/decoder/decode.php
Basics on firewalling: www.linuxdoc.org/HOWTO/Firewall-HOWTO.html
linux-firewall-tools: http://www.linux-firewall-tools.com/linux/
CERT: Home Network Security: http://www.cert.org/tech_tips/home_networks.html
Firewall FAQ: http://www.faqs.org/faqs/firewalls-faq/
Assigned ports > 1024: http://www.ec11.dial.pipex.com/port-num4.shtml
Port designations: http://www.chebucto.ns.ca/~rakerman/port-table.html
Firewall Forensics FAQ (What am I seeing?): http://www.robertgraham.com/pubs/firewall-seen.html
Linux Firewall and Security Site: http://www.linux-firewall-tools.com/linux/
Auditing Your Firewall Setup (old, still usefull), : http://www.enteract.com/~lspitz/audit.html
TLDP: Firewall Piercing mini-HOWTO: http://www.tldp.org/HOWTO/mini/Firew...cing/x189.html
Something called the "Home PC Firewall Guide": http://www.firewallguide.com/
Vendor/Ethernet MAC Address Lookup: http://www.coffer.com/mac_find/
Netfilter Iptabes/Ipchains Log Format: http://logi.cc/linux/netfilter-log-format.php3
Dshield (find out if IP was marked as used in attacks): http://www1.dshield.org/ipinfo.php
Port search (Snort): http://www.snort.org/ports.html
Neohapsis Port search: http://www.neohapsis.com/neolabs/neo-ports/
P2P ports (IPMasq): http://www.tsmservices.com/masq/cfm/main.cfm
Is "Stealth" important?: http://www.practicallynetworked.com/...et.htm#Stealth
Infosyssec's Firewall Security and the Internet (badly updated site): http://www.infosyssec.net/infosyssec/firew1.htm

Webbased portscan services:
http://www.linux-sec.net/Audit/nmap.test.gwif.html
http://www.derkeiler.com/Service/PortScan/
http://scan.sygatetech.com/
http://www.sdesign.com/securitytest/
http://www.auditmypc.com/
http://www.dslreports.com/scan
http://crypto.yashy.com/nmap.php
http://www.grc.com/


DoS info
Hardening the TCP/IP stack to SYN attacks: http://www.securityfocus.com/infocus/1729
SANS, Help Defeat Denial of Service Attacks: Step-by-Step: http://www.sans.org/dosstep/index.htm
SANS, ICMP Attacks Illustrated: http://rr.sans.org/threats/ICMP_attacks.php
CERT, Denial of Service Attacks: http://www.cert.org/tech_tips/denial_of_service.html
NWC, Fireproofing Against DoS Attacks (forms of): http://www.nwc.com/1225/1225f38.html

DDoS info
SANS, Consensus Roadmap for Defeating Distributed Denial of Service Attacks: http://www.sans.org/ddos_roadmap.htm
SANS, Spoofed IP Address Distributed Denial of Service Attacks: Defense-in-Depth: http://rr.sans.org/threats/spoofed.php
SANS, Understanding DDOS Attack, Tools and Free Anti-tools with Recommendation: http://rr.sans.org/threats/understan...nding_ddos.php
Juniper.net, Minimizing the Effects of DoS Attacks: http://arachne3.juniper.net/techcent...te/350001.html
CISCO, Strategies to Protect Against Distributed Denial of Service (DDoS) Attacks: http://www.cisco.com/warp/public/707/newsflash.html
Dave Dittrich's references: http://staff.washington.edu/dittrich/misc/ddos/
Xinetd Sensors: http://www.gate.net/~ddata/xinetd-sensors.html
Xinetd FAQ: http://synack.net/xinetd/faq.html

Original Source: Linuxquestions.org

Hi, I found this reference information for people who wants to get rich knowlege about sysadmin.. (Part 1)

Part1 - Basics, important sites, HOWTO's, handbooks, hardening, tips
Part2 - Netfilter, firewall, Iptables, Ipchains, DoS, DDoS
Part3 - Intrusion detection, integrity checks: IDS, NIDS, HIDS, Antivirus, software
Part4 - Chroot, chrooting, jailing, comparimization
Part5 - Forensics, recovery, undelete
Part6 - Securing networked services

Part1 - Basics, important sites, HOWTO's, handbooks, hardening, tips

Basics, important sites, HOWTO's, handbooks, hardening, tips

Checklists
UNIX Security Checklist v2.0: http://www.cert.org/tech_tips/unix_s...cklist2.0.html
SANS, The Twenty Most Critical Internet Security Vulnerabilities: http://www.sans.org/top20/
SANS SCORE Checklists for W32/Solaris/Cisco IOS/Mac OS/etc etc: http://www.sans.org/score/
SANS http://www.sans.org/infosecFAQ/linux/linux_list.htm
SANS, Reading room, Linux Issues: http://www.sans.org/rr/catindex.php?cat_id=32

Securing
CERT, Security improvements: http://www.cert.org/security-improvement/
CERT, Tech Tips: http://www.cert.org/tech_tips/
Linux Administrator's Security Guide (LASG): http://www.seifried.org/lasg/
Linux Security Administrator's Guide (SAG, old): http://www.tldp.org/LDP/sag/index.html
The Linux Network Administrator's Guide (NAG): http://www.tldp.org/LDP/nag2/index.html
Securing & Optimizing Linux: The Ultimate Solution (PDF): http://www.tldp.org/LDP/solrhe/Secur...ution-v2.0.pdf
Securing Optimizing Linux RH Edition (older): http://tldp.org/LDP/solrhe/Securing-...-Edition-v1.3/
Linux Security HOWTO: http://tldp.org/HOWTO/Security-HOWTO/index.html
Linux Security Quick Reference Guide (PDF): http://www.tldp.org/REF/ls_quickref/QuickRefCard.pdf
Security Quick-Start HOWTO for Linux,: http://tldp.org/HOWTO/Security-Quickstart-Redhat-HOWTO/
Security links at Linuxguru's: http://www.linuxguruz.org/z.php?id=914
TLPD Networking Security HOWTO's: http://www.tldp.org/HOWTO/HOWTO-INDE...ml#NETSECURITY

Compromise, breach of security, detection
Intruder Detection Checklist (CERT): http://www.cert.org/tech_tips/intrud...checklist.html
Detecting and Removing Malicious Code (SF): http://www.securityfocus.com/infocus/1610
Steps for Recovering from a UNIX or NT System Compromise: http://www.cert.org/tech_tips/root_compromise.html
Formatting and Reinstalling after a Security Incident (SF): http://www.securityfocus.com/infocus/1692
How to Report Internet-Related Crime (usdoj.gov CCIPS): http://www.usdoj.gov/criminal/cybercrime/reporting.htm
Related, old(er) articles/docs:
Intruder Discovery/Tracking and Compromise Analysis: http://staff.washington.edu/dittrich...khat/blackhat/
Intrusion DetectionPrimer: http://www.linuxsecurity.com/feature...e_story-8.html
Through the Looking Glass: Finding Evidence of Your Cracker (LG): http://www.linuxgazette.com/issue36/kuethe.html
Recognizing and Recovering from Rootkit Attacks: http://www.cs.wright.edu/people/facu...on/obrien.html
See also post #5 under Forensics docs

Advisories, alerts, bulletins, disclosure, mailinglists, mailing archives, knowledge bases, other sites
Bugtraq (running): http://www.mail-archive.com/bugtraq@securityfocus.com/
or http://msgs.securepoint.com/cgi-bin/...q-current.html
or http://www.der-keiler.de/Mailing-Lis...focus/bugtraq/
or RSS: http://www.djeaux.com/rss/insecure-full-bugtraq.rss
Linuxsecurity: http://www.linuxsecurity.com
or RSS (Advisories): http://www.linuxsecurity.com/static-...advisories.rss
or RSS (News articles): http://www.linuxsecurity.com/static-...y_articles.rss
Securityfocus: http://www.securityfocus.com
or RSS (Vulns): http://www.securityfocus.com/rss/vulnerabilities.xml
Securiteam: http://www.securiteam.com/
CERT KB: http://www.cert.org/kb/
Securitytracker (Advisories): http://www.securitytracker.com/topics/topics.html
SANS RSS (ISC): http://iscxml.sans.org/rssfeed.xml

Neohapsis (mailinglists/archives): http://www.neohapsis.com
theaimsgroup (mailinglists/archives): http://marc.theaimsgroup.com/
Der Keiler (mailinglists/archives): http://www.der-keiler.de/

Linux Gazette: http://www.linuxgazette.com
Experts exchange: http://www.experts-exchange.com
The Linux Documentation Project: http://www.tldp.org
Blacksheep (HOWTO's, whitepapers, etc): http://www.blacksheepnetworks.com/security/
IRIA: http://www.ists.dartmouth.edu/IRIA/k...base/index.htm
E-secure-db Security Information Darabase: http://www.e-secure-db.us/dscgi/ds.p...ollection-1586
Linuxmag, Hardening Linux Systems: http://www.linux-mag.com/2002-09/guru_01.html
SEI: http://www.sei.cmu.edu/publications/lists.html
Matt's Unix Security Page: http://www.deter.com/unix/
Jay Beale's docs (Bastille-linux/CIS): http://www.bastille-linux.org/jay/se...icles-jjb.html
The Unix Auditor's Practical Handbook: http://www.nii.co.in/tuaph.html
Aging stuff from Phrack like "Unix System Security Issues": www.fc.net/phrack/files/p18/p18-7.html

Mailinglists distro specific:
RedHat
http://www.redhat.com/support/errata/
http://www.redhat.com/mailing-lists/...ist/index.html

Debian
Our own markus1982 on a roll! LQ HOWTO: securing debian:
http://www.linuxquestions.org/questi...threadid=61670
http://bugs.debian.org/
http://lists.debian.org/ (search for debian-security@lists.debian.org)
http://security.debian.org/

S.u.S.E.
mailto:suse-security@suse.com
mailto:suse-security-announce@suse.com
(subscribe: mailto:suse-security-subscribe@suse.com)

Mandriva
http://www.mandriva.com/en/security/advisories

Conectiva Linux
http://distro.conectiva.com/seguranca/
mailto:seguranca@distro.conectiva.com.br (subscribe for URL above URL; security-mailinglist Lingua Franca is Portugese, but on updates-mailinglist it's Engish. The last one always has the packages updates announced on security-mailinglist.

Slackware
http://www.slackware.com/lists/
mailto:slackware-security@slackware.com (subscribe for URL above)

# We need to incorporate more distro's here.

Hardening, distro specific
Debian/Mandrake/Red Hat: Bastille Linux: http://www.bastille-linux.org/
Debian Security HOWTO: http://www.debian.org/doc/manuals/se...-debian-howto/
Debian Security FAQ: http://www.debian.org/security/faq
Mandrake: msec-*.rpm: http://www.linux-mandrake.com/
SuSE: http://www.suse.de/~marc/
Slackware: Slackware Administrators Security tool kit: http://sourceforge.net/projects/sastk/
Slackware: http://members.cox.net/laitcg/new/system-hardening.txt

Log analysis tools, resources
Auditd: Linux Audit: http://people.redhat.com/sgrubb/audit/
Auditd: CAPP rules example: http://www.math.ias.edu/doc/audit-1.0.3/capp.rules
Tools & Tips for auditing code: http://www.vanheusden.com/Linux/audit.html
Track unlink syscall (rm): TrackFS, libauditunlink, LAUS, LTT (Syscalltrack on 2.4)
# FWanalog (Summarizes IPF & IPtables firewall logs)
# FWlogsum (Summarizes Checkpoint FW1 logs)
# FWlogwatch (Summarizes firewall & IDS logs)
# KLogger (WinNT/Win2K keystroke logger)
# Linux Event Logger (For Enterprise-Class Systems): http://evlog.sourceforge.net/
# Lmon (PERL-based real time log monitoring solution)
# LogSentry (Monitors logs for security violations)
# Logsurfer (Monitors logs in realtime)
# PIdentd (Provides UserID with TCP connects)
# Swatch (Monitors syslog messages)
# Secure Remote Syslogger (Encrypted streaming syslog)
# SnortSnarf (HTMLized Snort Log Reviewer)
# Syslog-NG (Replacement for standard syslog facility)
# Syslog.Org (Vast info on syslogging)
# Throughput Monitor (An event counter per timeframe log analyzer): http://home.uninet.ee/~ragnar/throughput_monitor/
Loganalysis.org (check the library): http://www.loganalysis.org/
Counterpane, Log Analysis Resources: http://www.counterpane.com/log-analysis.html
EVlog, Linux Event Logging for Enterprise-class systems
Throughput Monitor
Need to add: Snare, LTK etc etc

Daemons, device or application specific:
The Linux-PAM System Administrators Guide
Securing Xwindows: http://www.uwsg.indiana.edu/usail/ex...d/xsecure.html
How to Build, Install, Secure & Optimize Xinetd: #(link gone, see: http://web.archive.org/web/200410121...netd/index.php)
Installation of a secure webserver (SuSE): #(link gone, do a websearch for "suse_secure_webserver.txt")
Linksys security (LQ notes on): http://www.linuxquestions.org/questi...007#post157007

Auditing tools at:
Packetstorm: http://www.packetstormsecurity.org/UNIX/audit/
SecurityFocus: http://www.securityfocus.com/tools/category/1

Original Source: Linuxquestions.org

This should activate Spamassassin on all mailboxes:
# /usr/local/psa/admin/bin/mchk --with-spam

To upgrade Spamassassin you can run:
# yum update spamassassin

What is Yum?
" Yum is an automatic updater and package installer/remover for rpm systems. It automatically computes dependencies and figures out what things should occur to install packages. It makes it easier to maintain groups of machines without having to manually update each one using rpm.

Features include:

• Multiple Repositories
• Simple config file
• Correct dependency calculation
• Fast operation
• rpm-consistent behavior
• comps.xml group support, including multiple repository groups
• Simple interface"

( Font )

How to install Yum on centOS server:

Login to your server as root and create yum directory
# cd /usr/local/src/
# mkdir youm
# cd yum

Now download some rpms that yum needs:
# wget http://centos.cs.ucr.edu/centos/4/apt/i386/RPMS.os/python-urlgrabber-2.9.6-2.noarch.rpm
# wget http://centos.cs.ucr.edu/centos/4/apt/i386/RPMS.os/python-sqlite-1.1.6-1.i386.rpm
# wget http://centos.cs.ucr.edu/centos/4/apt/i386/RPMS.os/python-elementtree-1.2.6-4.i386.rpm
# wget http://centos.cs.ucr.edu/centos/4/apt/i386/RPMS.os/python-urlgrabber-2.9.6-2.noarch.rpm
# wget http://centos.cs.ucr.edu/centos/4/apt/i386/RPMS.os/sqlite-3.2.2-1.i386.rpm
# rpm -Uvh *rpm

Download and install yum:
# wget http://centos.cs.ucr.edu/centos/4/apt/i386/RPMS.os/centos-yumconf-4-4.3.noarch.rpm
# wget http://centos.cs.ucr.edu/centos/4/apt/i386/RPMS.os/yum-2.4.0-1.centos4.noarch.rpm
# rpm -Uvh *rpm

You are running a Plesk server and dont know what linux packages should you update. You can configure yum with atomicrocketturtle configuration.

Read this:
How to Install yum on centOS

Login to your server as root. You can configure using:

- Automatic configuration
# Using Lynx (yum -y install lynx):
# lynx -source http://3es.atomicrocketturtle.com/installers/atomic.sh | sh

- Wget:
# wget http://3es.atomicrocketturtle.com/installers/atomic.sh
# sh ./atomic.sh

Now for example, if you whant to upgrade spamassassin:
# yum update spamassassin

It will only install / update compatible rpms with Plesk.

Some exploits will try to use unix resources to download rootkits and other bad files to your system. You can deny it fixing some permissions on that resources.

Trick: Make a backup of /usr/bin, /usr/sbin, /bin, /sbin
You will be able to replace it if you detected some infected file with rkhunter or chrootkit.
Read this:
How to Install Rkhunter
How to Install Rootcheck

# chmod 700 /usr/bin/rcp
# chmod 700 /usr/bin/wget
# chmod 700 /usr/bin/lynx
# chmod 700 /usr/bin/links
# chmod 700 /usr/bin/scp
# chmod 000 /etc/httpd/proxy/
# chmod 000 /var/mail/vbox
# chmod 700 /usr/bin/mc
# chmod 700 /usr/bin/elinks
# chmod 700 /usr/bin/lwp-download
# chmod 700 /usr/bin/GET
# chmod 700 /usr/bin/curl

You can also block all *cc compilers on /usr/bin to permit only root user to use compilers:
# cd /usr/bin/
# ls -l
# chmod 700 /usr/bin/
Example:
# chmod 700 byacc
# chmod 700 cc
# chmod 700 gcc
# chmod 700 gnatgcc
# chmod 700 perlcc
# chmod 700 yacc