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Apache HTTP Server mod_proxy Reverse Proxy Mode Security Bypass Weakness

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Release Date:  2011-10-06    Last Update:  2013-07-29    Views:  6,849

Secunia Advisory SA46288

Where:

From remote

Impact:

Security Bypass

Solution Status:

Vendor Patch

CVE Reference(s):

Description


A weakness has been reported in Apache HTTP Server, which can be exploited by malicious people to bypass certain security restrictions.

The weakness is caused due to the mod_proxy module, when configured in reverse proxy mode, incorrectly processing certain web requests. This can be exploited to send requests to an unintended server behind the proxy via a specially crafted URL.

Successful exploitation requires the use of "ProxyPassMatch" and "RewriteRule" configuration directives with a certain pattern match.

The weakness is reported in all 2.x versions.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Michael Jordon and David Robinson, Context Information Security Ltd.

Original Advisory:
Apache:
http://mail-archives.apache.org/mod_mbox/httpd-announce/201110.mbox/browser
http://svn.apache.org/viewvc?view=revision&revision=1188745
http://marc.info/?l=apache-httpd-dev&m=131955975103801&w=2
http://mail-archives.apache.org/mod_mbox/httpd-announce/201201.mbox/browser
http://mail-archives.apache.org/mod_mbox/httpd-announce/201307.mbox/%3C20130710124920.2b8793ed.wrowe%40rowe-clan.net%3E

Context Information Security Ltd:
http://www.contextis.com/research/blog/reverseproxybypass/

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Apache HTTP Server mod_proxy Reverse Proxy Mode Security Bypass Weakness

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