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Apache mod_proxy "Content-Length:" Header Buffer Overflow Vulnerability
Secunia Advisory: SA11841
Release Date: 2004-06-10
Last Update: 2005-10-14
Popularity: 27,425 views

Critical:
Highly critical
Impact: DoS
System access
Where: From remote
Solution Status: Vendor Patch

Software:Apache 1.3.x

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CVE reference:CVE-2004-0492


Description:
Georgi Guninski has discovered a vulnerability in Apache, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.

The vulnerability is caused due to a boundary error within the Apache mod_proxy module. This can be exploited to cause a heap-based buffer overflow by passing a "Content-Length:" header containing a large negative value.

Successful exploitation may reportedly crash the child process and potentially allow code execution on some BSD systems, if an Apache server, which is configured as a proxy, connects to a malicious site.

The vulnerability affects versions 1.3.31, 1.3.29, 1.3.28, 1.3.27, and 1.3.26.

Solution:
Update to version 1.3.32.
http://httpd.apache.org/download.cgi

Provided and/or discovered by:
Georgi Guninski

Changelog:
2004-10-20: Added link to US-CERT vulnerability note.
2004-10-22: Updated "Solution" section.
2005-10-14: Added link to "Original Advisory".

Original Advisory:
Apache.org:
http://www.apache.org/dist/httpd/Announcement1.3.html

Georgi Guninski:
http://www.guninski.com/modproxy1.html

Other References:
US-CERT VU#541310:
http://www.kb.cert.org/vuls/id/541310


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