Denial-of-Service Attack Possible from Linux RPC Client

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This article was previously published under Q262388

SYMPTOMS

If Windows 2000 receives a Server Message Block (SMB) packet with an invalid length, it may corrupt memory. The corruption will usually cause a blue screen error message.

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This was fixed by checking the length of the packet received to ensure it is valid. If the length is not valid, the packet is rejected.

To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 (http://support.microsoft.com/kb/260910/EN-US/ ) How to Obtain the Latest Windows 2000 Service Pack

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Windows NT 4.0

To resolve this problem, obtain the Windows NT 4.0 Security Rollup Package. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

299444 (http://support.microsoft.com/kb/299444/EN-US/ ) Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)

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Microsoft Windows NT Server version 4.0, Terminal Server Edition

To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package (SRP). For additional information about the SRP, click the article number below to view the article in the Microsoft Knowledge Base:

317636 (http://support.microsoft.com/kb/317636/EN-US/ ) Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package

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STATUS

Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Windows 2000. This problem was first corrected in Windows 2000 Service Pack 1.

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