Apache (mod_proxy_ftp) Undefined Charset UTF-7 XSS Vulnerability

2008.01.10
Credit: sp3x
Risk: Low
Local: Yes
Remote: Yes
CWE: CWE-79


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 [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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.7 (GNU/Linux) iD8DBQFHhUp2haZ93YsJSwQRAgYPAJ9CYYZv1MthEQpfqg97ReFQ56RHVQCfdoKs 0uz3Q3HNdQfgbuc8uRh3Ol8= =dn1x -----END PGP SIGNATURE-----


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