Re: *ALERT* BID 3581: Wu-Ftpd File Globbing Heap Corruption Vulnerability

From: Flavio Veloso (flaviovs@magnux.com)
Date: 11/29/01 

Date: Thu, 29 Nov 2001 09:32:33 -0200 (BRST)
From: Flavio Veloso <flaviovs@magnux.com>
To: script0r <script0r@axenet.org>
Subject: Re: *ALERT* BID 3581: Wu-Ftpd File Globbing Heap Corruption Vulnerability
Message-ID: <Pine.LNX.4.33.0111290927390.25703-100000@ops.magnux.com>

On Wed, 28 Nov 2001, script0r wrote:

> > Subject: Wu-Ftpd File Globbing Heap Corruption Vulnerability
   (...)
> I am running the a linux port of the bsd ftpd and it might be vulnerable to
> a similar attack,
>
> ftp localhost
> Connected to localhost.
> 220 playlandFTP server (Version 6.5/OpenBSD, linux port 0.3.3) ready.
> Name (localhost:user): ftp
> 331 Guest login ok, type your name as password.
> Password:
> 230 Guest login ok, access restrictions apply.
> Remote system type is UNIX.
> Using binary mode to transfer files.
> ftp> ls ~{
> 200 PORT command successful.
> 421 Service not available, remote server has closed connection
>
> in inetd I find an error stating that the ftpd process has died unexpectedly
>
> Nov 28 14:21:28 playland inetd[82]: pid 16341: exit signal 11

This may not be related to the wu-ftpd bug. I was just experiencing
the same problem here, but further investigation showed up that it was
due a bug in the glibc implementation of glob(3) (not exploitable,
AFAICT).

See http://sources.redhat.com/ml/bug-glibc/2001-11/msg00109.html for
details. 

-- 
Flávio

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