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TITLE:
Apache mod_proxy_ftp EPSV Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA36549

VERIFY ADVISORY:
http://secunia.com/advisories/36549/

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

The vulnerability is caused due to an error in mod_proxy_ftp when
processing responses received from FTP servers. This can be exploited
to trigger a NULL-pointer dereference and crash an Apache child
process via a malformed EPSV response.

Successful exploitation requires that a threaded Multi-Processing
Module is used and that the mod_proxy_ftp module is enabled.

The vulnerability is confirmed in Apache versions 2.0.63 and 2.2.13.
Other versions may also be affected.

SOLUTION:
Restrict proxy access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Evgeny Legerov

ORIGINAL ADVISORY:
http://www.intevydis.com/blog/?p=59

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