BugTraq
SYMSA-2007-012: Microsoft Windows CE IGMP Denial of Service Oct 23 2007 01:03AM
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Symantec Vulnerability Research

http://www.symantec.com/research

Security Advisory

Advisory ID: SYMSA-2007-012

Advisory Title: Microsoft Windows CE IGMP Denial of Service

Author: Ollie Whitehouse / ollie_whitehouse (at) symantec (dot) com [email concealed]

Release Date: 22-10-2007

Application: Windows CE 5.01 / Windows Mobile 5

Platform: Microsoft Windows

Severity: Denial of Service

Vendor status: Update Available

CVE Number: CVE-2006-0021

Reference: http://www.securityfocus.com/bid/16645

Overview:

This issue was originally discovered by Douglas Nascimento of

Datacom and published in Microsoft security bulletin MS06-007 on

Feburary 14th 2006 and subsequently updated March 17th 2006. A

condition exists with the Microsoft IP stack wherein a specially

crafted IGMP packet causes a denial of service condition. In

Microsoft's original advisory, Windows CE was omitted as a

vulnerable platform; however, In Symantec's testing it was

discovered that Windows CE 5.01 (shipped as part of the Windows

Mobile 5 PocketPC and SmartPhone editions) is vulnerable. Symantec

notified Microsoft in Feburary 2006 of the fact that CE was

affected with Microsoft releasing a patch in KB930642 in

Feburary 2007.

Details:

On the day of release Symantec developed a working trigger for this

vulnerability. A public exploit for this issue was released by

Alexey Sintsov on the 21st of March 2006. When an IGMP packet is

supplied with invalid IP options then it will cause a denial of

service condition. As IGMP can be sent both via unicast and mulicast

it is possible to cause the issue to manifest itself in many devices

with a single packet if appropiate network filtering is not in place.

Vendor Response:

There is a security vulnerability that could allow for Denial of

Service (DoS) by sending a specifically crafted TCP/IP packet to the

mobile device. However most attempts to exploit this vulnerability

would result in a Denial of Service Condition on the networking

capabilities of the device.

The following devices may be vulnerable to this issue:

Windows CE 4.2 - Windows CE .NET 4.2 Platform Builder

Monthly Update (September 2007)

Windows Mobile 5.0 - A fix for this issue has been provided by

Microsoft via http://support.microsoft.com/kb/930642

Fixed in Windows Mobile 6.0.

Recommendation:

Windows Mobile 5.0 customers please see your handset manufacturer to

obtain the update customized for your device to Windows Mobile 6.

OEMs which utilise Windows CE should ensure KB930642 is applied to

their build environment. Details can be found here on Microsoft's

support site - http://support.microsoft.com/kb/930642/.

Carriers should ensure appropiate network filtering is in place in

order to protect affected handsets.

Common Vulnerabilities and Exposures (CVE) Information:

The Common Vulnerabilities and Exposures (CVE) project has assigned

the following names to these issues. These are candidates for

inclusion in the CVE list (http://cve.mitre.org), which standardizes

names for security problems.

CVE-2006-0021

- -------Symantec Vulnerability Research Advisory Information-------

For questions about this advisory, or to report an error:

research (at) symantec (dot) com [email concealed]

For details on Symantec's Vulnerability Reporting Policy:

http://www.symantec.com/research/Symantec-Responsible-Disclosure.pdf

Symantec Vulnerability Research Advisory Archive:

http://www.symantec.com/research/

Symantec Vulnerability Research GPG Key:

http://www.symantec.com/research/Symantec_Vulnerability_Research_GPG.asc

- -------------Symantec Product Advisory Information-------------

To Report a Security Vulnerability in a Symantec Product:

secure (at) symantec (dot) com [email concealed]

For general information on Symantec's Product Vulnerability

reporting and response:

http://www.symantec.com/security/

Symantec Product Advisory Archive:

http://www.symantec.com/avcenter/security/SymantecAdvisories.html

Symantec Product Advisory PGP Key:

http://www.symantec.com/security/Symantec-Vulnerability-Management-Key.a
sc

- ---------------------------------------------------------------

Copyright (c) 2007 by Symantec Corp.

Permission to redistribute this alert electronically is granted

as long as it is not edited in any way unless authorized by

Symantec Consulting Services. Reprinting the whole or part of

this alert in any medium other than electronically requires

permission from research (at) symantec (dot) com. [email concealed]

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.

Symantec, Symantec products, and Symantec Consulting Services are

registered trademarks of Symantec Corp. and/or affiliated companies

in the United States and other countries. All other registered and

unregistered trademarks represented in this document are the sole

property of their respective companies/owners.

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