bugtraq - Anon Proxy Server <= 0.102 remote buffer overflow

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Date: Sun, 3 Feb 2008 20:09:41 +0100
From: L4teral <l4teral@...il.com>
To: bugtraq@...urityfocus.com
Subject: Anon Proxy Server <= 0.102 remote buffer overflow

======================================================================
Anon Proxy Server <= 0.102 remote buffer overflow
======================================================================

Author:          L4teral <l4teral [4t] gmail com>
Impact:          remote buffer overflow
Status:          patch available

------------------------------
Affected software description:
------------------------------

Application:     Anon Proxy Server
Version:         <= 0.102
Vendor:          http://anonproxyserver.sourceforge.net

Description:
A fast http, https, socks caching proxy server.
Easy web based configuration, optional p2p anonymous mode.

--------------
Vulnerability:
--------------

When user authentication is enabled, the server can be exploited by
passing a long username containing quotes. The username is checked
for length, but the function strquotecpy() in the file access.c
escapes quote characters by prepending a backslash, enlarging
the string without checking it for the resulting length.

------------
PoC/Exploit:
------------

Use the following perl code to generate a username triggering
the buffer overflow when used for authentication:

#!/usr/bin/perl
print "A" x 430 . '"' x 29 . "A" x 40 . "\n";

The program will catch the exception and restart itself - attach a
debugger to see the EIP overwrite.

---------
Solution:
---------

Upgrade to version 0.103 or higher.

---------
Timeline:
---------

2008-01-27 - vendor informed
2008-01-28 - vendor released patch
2008-02-03 - public disclosure