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Vulnerability Note VU#663763

Apache mod_proxy_ftp XSS vulnerability

Overview

The Apache web server mod_proxy_ftp module contains a cross-site scripting (XSS) vulnerability.

I. Description

The Apache mod_proxy_ftp module allows the Apache web server to act as a proxy for FTP sites. Filename globbing is the process of using wildcards to match filenames. The mod_proxy_ftp module contains an XSS vulnerability that occurs because the module does not properly filter globbed characters in FTP URIs.

II. Impact

A remote attacker may be able to execute arbitrary Javascript in the context of a site being proxied by the Apache server.

III. Solution

Upgrade

Apache has released updates to address this issue. These updates are available on the Apache SVN server:
http://svn.apache.org/viewvc?view=rev&revision=682868
http://svn.apache.org/viewvc?view=rev&revision=682870
http://svn.apache.org/viewvc?view=rev&revision=682871

Note that vendors who distribute Apache may not have immediately have a version or update that contains these fixes.

Workarounds

  • Mozilla Firefox users can use the NoScript extension to keep Javascript from running in untrusted domains.
  • Application firewalls and IPS systems may be able to block certain types of XSS attacks at the network perimeter.

Systems Affected
VendorStatusDate NotifiedDate Updated
Apache HTTP Server ProjectVulnerable8-Aug-2008

References


http://www.securityfocus.com/archive/1/495180
http://svn.apache.org/viewvc?view=rev&revision=682868
http://svn.apache.org/viewvc?view=rev&revision=682870
http://svn.apache.org/viewvc?view=rev&revision=682871
http://ftpsearch.ntua.gr/globbing.html
http://noscript.net/

Credit

Thanks to Rapid7 and Apache for information that was used in this report.

This document was written by Ryan Giobbi.

Other Information

Date Public:2008-08-06
Date First Published:2008-08-08
Date Last Updated:2008-08-08
CERT Advisory: 
CVE-ID(s):CVE-2008-2939
NVD-ID(s):CVE-2008-2939
US-CERT Technical Alerts: 
Metric:2.70
Document Revision:16

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