Vulnerability Assessment & Network Security Forums

If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.

Home >> Browse Vulnerability Assessment Database >> CGI abuses >> DokuWiki im_convert Arbitrary Code Execution Vulnerability

Vulnerability Assessment Details

DokuWiki im_convert Arbitrary Code Execution Vulnerability

Vulnerability Assessment Summary
Executes arbitrary command via DocuWiki im_convert Feature

Detailed Explanation for this Vulnerability Assessment

Summary :

The remote web server contains a PHP script that is affected by
multiple vulnerabilities.

Description :

The remote host is running DokuWiki, an open-source wiki application
written in PHP.

The installed version of DokuWiki fails to properly sanitize input to
the 'w' and 'h' parameters of the 'lib/exe/fetch.php' script before
using it to execute a command when resizing images. An
unauthenticated attacker can leverage this issue to execute arbitrary
code on the remote host subject to the rights of the web server
user id.

In addition, the application reportedly does not limit the size of
images when resizing them, which can be exploited to churn through CPU
cycles and disk space on the affected host.

Note that successful exploitation of this issue requires that
DokuWiki's 'imconvert' configuration option be set
by default, it is
not.

See also :

http://bugs.splitbrain.org/?do=details&id=924
http://bugs.splitbrain.org/?do=details&id=926
http://www.freelists.org/archives/dokuwiki/09-2006/msg00278.html

Solution :

Upgrade to DokuWiki release 2006-03-09e / 2006-09-28 or later.

Network Security Threat Level:

High / CVSS Base Score : 7
(AV:R/AC:L/Au:NR/C:P/A:P/I:P/B:N)

Networks Security ID: 20257

Vulnerability Assessment Copyright: This script is Copyright (C) 2006-2007 Tenable Network Security

Cables, Connectors