SecurityReason - Apache (mod_proxy_ftp) Undefined Charset UTF-7 XSS Vulnerability

[sp3x () securityreason com]

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[SecurityReason - Apache (mod_proxy_ftp) Undefined Charset UTF-7 XSS Vulnerability]

Author: sp3x

Date:
- - Written: 15.12.2007
- - Public: 10.01.2008

SecurityReason Research
SecurityAlert Id: 49

CVE: CVE-2008-0005
SecurityRisk: Low

Affected Software: Apache 2.2.x (mod_proxy_ftp)
                   Apache 1.3.x
                   Apache 2.0.x

Advisory URL: http://securityreason.com/achievement_securityalert/49
Vendor: http://httpd.apache.org

- --- 0.Description ---

The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating 
systems including UNIX and Windows NT. The goal of this project is to provide a secure, efficient and extensible server 
that provides HTTP services in sync with the current HTTP standards.

Apache has been the most popular web server on the Internet since April 1996. The November 2005 Netcraft Web Server 
Survey found that more than 70% of the web sites on the Internet are using Apache, thus making it more widely used than 
all other web servers combined.

mod_proxy_ftp : http://httpd.apache.org/docs/2.2/mod/mod_proxy_ftp.html

- From apache site : "It provides support for the proxying FTP sites. Note that FTP support is currently limited to the 
GET method."

- --- 1. Apache Undefined Charset UTF-7 XSS Vulnerability ---

The XSS(UTF7) exist in mod_proxy_ftp.c . Charset is not defined
and we can provide XSS attack using ";" char in URL by setting Charset to UTF-7.

- --- 2. Exploit ---

SecurityReason is not going to release a exploit to the general public.
Exploit was provided and tested for Apache Team .

- --- 3. How to fix ---

Update to Apache 2.2.7-dev
          Apache 1.3.40-dev
          Apache 2.0.62-dev

- --- 4. References ---

Apache2 Undefined Charset UTF-7 XSS Vulnerability : http://securityreason.com/achievement_securityalert/46 by 
Maksymilian Arciemowicz

- --- 5. Greets ---

For: Maksymilian Arciemowicz ( cXIb8O3 ), Infospec, pi3, p_e_a, mpp

- --- 6. Contact ---

Author: sp3x
Email: sp3x [at] securityreason [dot] com
GPG: http://securityreason.com/key/sp3x.gpg
http://securityreason.com
http://securityreason.pl
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