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AUSCERT External Security Bulletin Redistribution
ESB-2008.0106 -- [Win][UNIX/Linux]
Drupal Comment upload module - Arbitrary file upload vulnerability
6 February 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: Drupal Comment upload module versions 4.7.x and 5.x
Publisher: Drupal
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact: Cross-site Scripting
Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CVE-2008-0569
Original Bulletin: http://drupal.org/node/216024
Revision History: February 6 2008: Added CVE
January 31 2008: Initial Release
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- ------------SA-2008-015 - COMMENT UPLOAD - ARBITRARY FILE UPLOAD ------------
* Advisory ID: DRUPAL-SA-2008-015
* Project: Comment upload (third-party module)
* Version: 4.7.x, 5.x
* Date: 2007-January-30
* Security risk: Highly critical
* Exploitable from: Remote
* Vulnerability: Arbitrary file upload
- ------------DESCRIPTION------------
Comment upload enables file attachments for comments. To do so it uses and
subverts various functions from the upload module that are present in Drupal
core. In certain, common cases, comment upload passes incorrect data to the
upload validation functions, resulting in a validation bypass, which enables a
user with the "upload files" permission to upload files with arbitrary
extensions.
Using these files an attacker can perform cross site scripting attacks, and
depending on the server configuration, may also be able to execute arbitrary
code.
- ------------IMPORTANT NOTE------------
The steps above will stop malicious files from being uploaded, but will do
nothing to protect your site against files that have already been uploaded. Make
sure to carefully inspect the file system path and check for files with
extensions that should be forbidden. We recommend you remove any HTML file you
did not upload yourself. You should look for script tags, CSS includes,
Javascript includes, and onerror="" attributes if you need to review files
individually.
- ------------VERSIONS AFFECTED------------
* Comment upload for Drupal 4.7.x prior to 4.7.x-0.1
* Comment upload for Drupal 5.x prior to 5.x-0.1
Drupal core is not affected. If you do not use the contributed comment upload
module, there is nothing you need to do.
- ------------SOLUTION------------
Install the latest version:
* If you use Drupal 4.7.x install comment upload 4.7.x-0.1 [
http://drupal.org/node/216036 ]
* If you use Drupal 5.x install comment upload 5.x-0.1 [
http://drupal.org/node/216035 ]
See also the Comment upload project page [
http://drupal.org/project/comment_upload ].
- ------------REPORTED BY------------
webernet [ http://drupal.org/user/78438 ] reported an issue that was traced
back by the security team to comment upload.
- ------------CONTACT------------
The security contact for Drupal can be reached at security at drupal.org or via
the form at [ http://drupal.org/contact ].
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