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Nagios XI Privilege Escalation

Nagios XI Privilege Escalation
Posted Dec 15, 2011
Authored by 0a2940

Nagios XI versions prior to 2011R1.9 suffer from privilege escalation vulnerabilities.

tags | exploit, vulnerability
MD5 | 8af8ed4e1a4cca81686e92aea0211be7

Nagios XI Privilege Escalation

Change Mirror Download
================
Privilege escalation vulnerabilities in Nagios XI installer < 2011R1.9

Author: 0a29406d9794e4f9b30b3c5d6702c708

twitter.com/0a29 - 0a29.blogspot.com - GMail 0a2940
================
Description:
================

Multiple privilege escalations exist within Nagios XI installer.

Tested against 2011R1.8, dated October 28, 2011. Fixes detailed in
http://assets.nagios.com/downloads/nagiosxi/CHANGES-2011.TXT (2011R1.9
- 12/07/2011)

================
Details:
================

Vulnerability 1: Arbitrary RPM installation
-----
Files:
0-yum
1-prereqs

In certain situations files matching /tmp/epel-release*.rpm ,
/tmp/rpmforge-release*.rpm
and /tmp/php-pear-HTML-Template-IT*.rpm will be installed.

e.g. from 0-yum:

if ! rpm -q epel-release &>/dev/null; then
<snip>
cd /tmp
<snip>
rpm -Uvh epel-release*.rpm
-----

Vulnerability 2: Arbitrary crontab intallation
-----
Files:
install-crontab-root
install-crontab-nagios
uninstall-crontab-nagios

A malicious user can exploit a race condition to control the root and
nagios user's
crontab. By creating the temporary file in advance (to control
permissions) an attacker
can insert entries before it is used to update the crontab.

e.g. from install-crontab-root:
---
#!/bin/sh

crontab -l -u root | grep -v "/usr/local/nagiosxi/" > /tmp/root.crontab.new
cat nagiosxi/crontab.root >> /tmp/root.crontab.new

crontab -u root /tmp/root.crontab.new

rm -f /tmp/root.crontab.new

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