SMB: Microsoft Windows Smb Insufficent Entropy CVE-2010-0231 Authentication Bypass

This signature detects attempts to exploit a known vulnerability in Microsoft Windows SMB. It is due to a lack of cryptographic entropy when generating challenges to authenticate clients. Remote attackers can exploit this by continuously attempting to authenticate against a server. A successful attack can result in arbitrary code execution.

Extended Description

The SMB implementation in the Server service in Microsoft Windows 2000 SP4, Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 does not use a sufficient source of entropy, which allows remote attackers to obtain access to files and other SMB resources via a large number of authentication requests, related to server-generated challenges, certain "duplicate values," and spoofing of an authentication token, aka "SMB NTLM Authentication Lack of Entropy Vulnerability."

Affected Products

Microsoft windows_7

References

CVE: CVE-2010-0231

Short Name

SMB:ENTROPY-NEGO-AUTH-BYP

Severity

Major

Recommended

False

Recommended Action

Drop

SMB: Microsoft Windows Smb Insufficent Entropy CVE-2010-0231 Authentication Bypass

Extended Description

Affected Products

References

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