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TITLE:
Apache mod_proxy "date" Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA26636

VERIFY ADVISORY:
http://secunia.com/advisories/26636/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Apache 2.0.x
http://secunia.com/product/73/
Apache 2.2.x
http://secunia.com/product/9633/

DESCRIPTION:
A vulnerability has been reported in the Apache mod_proxy module,
which can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to the improper handling of date
headers within the "ap_proxy_date_canon()" function in proxy_util.c.
This can be exploited to cause a DoS by sending specially crafted
requests to the affected server.

Successful exploitation results in a crash if a threaded
Multi-Processing Module is used on servers where a reverse or forward
proxy is configured.

The vulnerability is reported in Apache 2.0.x versions 2.0.59 and
prior, and Apache 2.2.x versions 2.2.4 and prior.

SOLUTION:
The vulnerability is fixed in Apache 2.0.61-dev and Apache 2.2.6-dev.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://httpd.apache.org/security/vulnerabilities_20.html
http://httpd.apache.org/security/vulnerabilities_22.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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