SYMSA-2007-012: Microsoft Windows CE IGMP Denial of Service

Type securityvulns
Reporter Securityvulns
Modified 2007-10-24T00:00:00



                 Symantec Vulnerability Research
                       Security Advisory

Advisory ID: SYMSA-2007-012 Advisory Title: Microsoft Windows CE IGMP Denial of Service Author: Ollie Whitehouse / 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:


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.


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 Fixed in Windows Mobile 6.0.


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 -

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 (, which standardizes names for security problems.


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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

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