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Date: Tue, 07 Aug 2007 18:29:57 -0400
From: iDefense Labs <>
Subject: iDefense Security Advisory 08.07.07: Apple Mac OS X mDNSResponder
 HTTP Request Heap Overflow Vulnerability

Apple Mac OS X mDNSResponder HTTP Request Heap Overflow Vulnerability

iDefense Security Advisory 08.07.07
Aug 07, 2007


mDNSResponder is part of the Bonjour suite of applications. Bonjour is
used to provide automatic and transparent configuration of network
devices. It is similar to UPnP, in that the goal of both is to allow
users to simply plug devices into a network without worrying about
configuration details. mDNSResponder runs by default on both Server and
Workstation. More information can be found on the vendor's website.


Remote exploitation of a heap overflow vulnerability in Apple Inc.'s
mDNSResponder application may allow attackers to execute arbitrary code
with root privileges.

The vulnerability exists within the Legacy NAT Traversal code. Unlike
the core of the mDNSResponder service, this area of code does not rely
on Multicast UDP. It listens on a dynamically allocated Unicast UDP

The vulnerability occurs when parsing a malformed HTTP request. This
results in an exploitable heap overflow.


Exploitation of this vulnerability allows an attacker to execute
arbitrary code with root privileges on a vulnerable host. No
authentication is needed to exploit this vulnerability.

Failed attempts will result in the service crashing. Shortly after
crashing, it will be restarted.


iDefense has confirmed the existence of this vulnerability in Mac OS X
version 10.4.10, Server and Workstation, with mDNSResponder version
108.5. Previous versions may also be affected.


iDefense is currently unaware of any workarounds for this issue.


Apple addressed this vulnerability within their Mac OS X 2007-007
security update. More information is available at the following URL.


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-3744 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


07/26/2007  Initial vendor notification
07/26/2007  Initial vendor response
08/07/2007  Coordinated public disclosure


This vulnerability was reported to iDefense by Neil Kettle (mu-b) of

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Copyright © 2007 iDefense, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
 There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.

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