TITLE:
ProZilla "ftpsearch" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA17021

VERIFY ADVISORY:
http://secunia.com/advisories/17021/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
ProZilla 1.x
http://secunia.com/product/4312/

DESCRIPTION:
Tavis Ormandy has reported a vulnerability in ProZilla, which can be
exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a boundary error in the handling
of ftp search results in the "get_string_ahref()" function of
"ftpsearch.c". This can be exploited to cause a stack-based buffer
overflow and allows arbitrary code execution via a malicious server
that returns a search result with a specially crafted string in the
"HREF" attribute of the "<A>" tag.

Successful exploitation requires that ProZilla is used with the
"-ftpsearch" option, and also requires that the attacker is able to
poison the DNS cache.

The vulnerability has been reported in version 1.3.7.4. Prior
versions may also be affected.

SOLUTION:
The vulnerability has been fixed in the "libprozilla" CVS repository.

PROVIDED AND/OR DISCOVERED BY:
Tavis Ormandy

ORIGINAL ADVISORY:
http://genesys.ro/pipermail/prozilla/2005-September/000790.html

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