exploit the possibilities

aps-overflow.txt

aps-overflow.txt
Posted Feb 4, 2008
Authored by L4teral

Anon Proxy Server version 0.102 and below suffer from a remote buffer overflow vulnerability.

tags | advisory, remote, overflow
MD5 | 8e9f78c5cdd54f2a3eeb489f9ee0570b

aps-overflow.txt

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======================================================================
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
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