SYMSA-2007-012: Microsoft Windows CE IGMP Denial of Service
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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@xxxxxxxxxxxx
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
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Copyright (c) 2007 by Symantec Corp.
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