Core Security Technologies Advisory 2011.0810

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Core Security - Corelabs Advisory  
http://corelabs.coresecurity.com/  
  
  
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/content/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*  
  
e107's team has issued patch for this issue in the revision 12375 [1] of  
its SVN repository. Also the development version of e107 was patched in  
the revision 12376 [2]  
  
  
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.  
  
  
9. *References*  
  
[1]  
SVN reference to the patch for this issue in e107 (v0.7)  
  
http://e107.svn.sourceforge.net/viewvc/e107?view=revision&revision=12375  
  
[2]  
SVN reference to the patch for this issue in e107 (v0.8) (devel)   
  
http://e107.svn.sourceforge.net/viewvc/e107?view=revision&revision=12376  
  
10. *About CoreLabs*  
  
CoreLabs, the research center of Core Security Technologies, is charged  
with anticipating the future needs and requirements for information  
security technologies.  
We conduct our research in several important areas of computer security  
including system vulnerabilities, cyber attack planning and simulation,  
source code auditing, and cryptography. Our results include problem  
formalization, identification of vulnerabilities, novel solutions and  
prototypes for new technologies. CoreLabs regularly publishes security  
advisories, technical papers, project information and shared software  
tools for public use at:  
http://corelabs.coresecurity.com.  
  
11. *About Core Security Technologies*  
  
Core Security Technologies enables organizations to get ahead of threats  
with security test and measurement solutions that continuously identify  
and demonstrate real-world exposures to their most critical assets. Our  
customers can gain real visibility into their security standing, real  
validation of their security controls, and real metrics to more  
effectively secure their organizations.  
  
Core Security's software solutions build on over a decade of trusted  
research and leading-edge threat expertise from the company's Security  
Consulting Services, CoreLabs and Engineering groups. Core Security  
Technologies can be reached at +1 (617) 399-6980 or on the Web at:  
http://www.coresecurity.com.  
  
  
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, which is available for download at  
http://www.coresecurity.com/files/attachments/core_security_advisories.asc.  
  
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