Microsoft Windows Media Services Remote Denial of Service Vulnerability
It has been reported that Microsoft Windows Media Services is prone to a remote denial of service vulnerability. This may allow an attacker to cause the services to effectively deny access to legitimate users by sending specially crafted TCP/IP packets on TCP ports 7007 and/or 7778.
Microsoft Windows Media Services 4.1 included with Microsoft Windows 2000 Server Service Pack 2, Service Pack 3, and Service Pack 4 is reported to be vulnerable to this issue. Windows Media Services 4.1 for Windows NT 4.0 is not vulnerable.
Symantec Vulnerability Assessment
Symantec Vulnerability Assessment detects and reports this vulnerability. Click here for the advisory released March 9, 2004.
Symantec Enterprise Security Manager
Symantec Enterprise Security Manager posted an update to the OS Patch Policy that detects and reports systems that are not patched against this vulnerability. Click here for the advisory released March 9, 2004.
Microsoft Windows 2000 Server
Microsoft Windows 2000 Server SP1
Microsoft Windows 2000 Server SP2
Microsoft Windows 2000 Server SP3
Microsoft Windows 2000 Server SP4
Microsoft Windows Media Services 4.1
Block external access at the network boundary, unless service is required by external parties.
If media streams are not used over TCP, blocking TCP ports 7007 and 7778 at the network router or firewall will mitigate against attacks.
Modify default configuration files, to disable any unwanted behaviour.
Windows Media Services may be configured to offer Windows Media Unicast Services only, however, this may have adverse affects on the functionality of Windows Media Services.
Microsoft has released a security bulletin MSO4-008 including fixes to address this issue. For Windows 2000 Server, this security update requires Service Pack 2 (SP2), Service Pack 3 (SP3), or Service Pack 4 (SP4):
Microsoft Windows Media Services 4.1:
Microsoft Upgrade Security Update for Windows Media Services (KB832359)
Source: Microsoft Security Bulletin MS04-008
Discovery is credited to Qualys.
Copyright (c) 2004 by Symantec Corp.
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