Unicast Service Race Condition Vulnerability

A denial of service vulnerability exists in Microsoft® Windows Media™ Services which could allow a malicious user to prevent an affected server from providing useful service and content.

Issue

If a client sends a particular type of malformed request to a Windows Media server, it could induce a race condition. Once the server has been put into such a state, subsequent requests - even ones that would normally be legitimate - could cause the Windows Media Unicast Service to fail. If this happened, any ongoing sessions would be lost, and the server would stop providing unicast streaming media services.

An affected server could be put back into service by restarting the Unicast Service. The vulnerability would not cause any data loss, nor would it enable the malicious user to usurp any administrative privileges on the machine.

Affected Products

• Microsoft Windows Media Services 4.0 & 4.1

Download

Patch: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=24167

Further Details

Source: Microsoft Corporation

Reference: Microsoft Corporation

Updated: September 6, 2000

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