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Apache2 mod_proxy_balancer CSRF, XSS, Memory Corruption and DoS
Vulnerability
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SUMMARY
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".
<http://httpd.apache.org/docs/2.2/mod/mod_proxy_balancer.html>
mod_proxy_balancer manager "enables dynamic update of balancer members.
You can use balancer manager to change the balance factor or a particular
member, or put it in the off line mode". Multiple vulnerabilities have
been discovered in Apache2's mod_proxy_balancer management interface.
DETAILS
Vulnerable Systems:
* Apache version 2.2.x with mod_proxy_balancer
Immune Systems:
* Apache version 2.2.27-dev with mod_proxy_balancer
Apache2 Cross-Site Request Forgery (CSRF) Vulnerability
Due to 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.
Apache2 HTML Injection (XSS) Vulnerability
First XSS
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",
parameters in balancer-manager are not properly sanitized leading to
execute arbitrary HTML and script code in a victim's browser.
Second XSS
Input passed in the URL to "balancer-manager" is not properly sanitized
leading to execute arbitrary HTML and script code in a victim's browser.
Apache2 Denial of Service Vulnerability
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".
Apache2 Memory Corruption
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.
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6420>
CVE-2007-6420,
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6421>
CVE-2007-6421,
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6422>
CVE-2007-6422 and
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6423>
CVE-2007-6423
ADDITIONAL INFORMATION
The information has been provided by <mailto:sp3x@securityreason.com>
sp3x.
The original article can be found at:
<http://securityreason.com/achievement_securityalert/48>
http://securityreason.com/achievement_securityalert/48
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