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[Apache2 CSRF, XSS, Memory Corruption and Denial of Service Vulnerability ]
Author: sp3x
Date:
SecurityReason Research
SecurityAlert Id: 48
CVE: CVE-2007-6420
CVE-2007-6421
CVE-2007-6422
CVE-2007-6423
SecurityRisk: Low
Affected Software: Apache 2.2.x (mod_proxy_balancer)
Advisory URL:
http://securityreason.com/achievement_securityalert/48
Vendor: http://httpd.apache.org
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_balancer : http://httpd.apache.org/docs/2.2/mod/mod_proxy_balancer.html
balancer-manager is an administrative interface which should only be accessible to trusted users. Due to the fact the SecurityRisk is Low.
During the fact that all actions are performed by GET method there exist "CSRF" .
The balancer-manager should use POST for requests which have side-effects
which would significantly mitigate the "CSRF" issue.
β 2. Apache2 HTML Injection (XSS) Vulnerability β
β First XSS β
The HTML Injection (XSS) vulnerability exist in "mod_proxy_balancer.c" .
By Enabling Balancer Manager Support we can trigger XSS vulnerability .
Input passed to the :
"ss" - called ""StickySession Identifier",
"wr" - called "Route",
"rr" - called "Route Redirect",
parametrs in balancer-manager are not properly sanitised leading to execute arbitrary HTML and script code in a victim's browser.
Input passed in the URL to "balancer-mamanger" is not properly sanitised leading to execute arbitrary HTML and script code in a victim's browser.
The Denial of Service is caused due to an error in the "balancer_handler()" function that manages the loadfactors and member status. When attacker input invalid "bb" variable while editing worker settings leads to "Denial of Service Vulnerability".
The Memory corruption is caused due to an error in the "mod_proxy_balancer" when attacker input in the URL 7390 or 7506 or 7622 "A" chars.
Only for Windows.
SecurityReason is not going to release a exploit to the general public.
Exploit was provided and tested for Apache Team .
Update to Apache 2.2.7-dev
http://httpd.apache.org/security/vulnerabilities_22.html
CSRF : http://www.owasp.org/index.php/Testing_for_CSRF
For: Maksymilian Arciemowicz ( cXIb8O3 ), Infospec, pi3, p_e_a, mpp
Author: sp3x
Email: sp3x [at] securityreason [dot] com
GPG: http://securityreason.com/key/sp3x.gpg
http://securityreason.com
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