Secunia Security Advisory - halfdog has reported a vulnerability in Apache HTTP Server, which can be exploited by malicious, local users to cause a DoS (Denial of Service).
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TITLE:
Apache HTTP Server "ap_pregsub()" Denial of Service Vulnerability
SECUNIA ADVISORY ID:
SA46823
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RELEASE DATE:
2011-11-11
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DESCRIPTION:
halfdog has reported a vulnerability in Apache HTTP Server, which can
be exploited by malicious, local users to cause a DoS (Denial of
Service).
The vulnerability is caused due to the "apr_pregsub()" function
(server/utils.c) not properly limiting the maximum size of
environment variable values, which can be exploited to e.g. cause a
huge memory consumption via a specially crafted ".htaccess" file.
This is related to:
SA45793
The vulnerability is reported in versions 2.0.64 and 2.2.21. Other
versions may also be affected.
SOLUTION:
Restrict access to trusted users only.
PROVIDED AND/OR DISCOVERED BY:
halfdog
ORIGINAL ADVISORY:
http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/
http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html
OTHER REFERENCES:
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