[NT] Microsoft Windows DCERPC Authentication Denial of Service Vulnerability

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Microsoft Windows DCERPC Authentication Denial of Service Vulnerability
------------------------------------------------------------------------


SUMMARY

A vulnerability allows remote attackers to crash systems with vulnerable
installations of the Microsoft Windows operating system. Authentication is
not required to exploit this vulnerability.

DETAILS

The specific flaw exists within the RPC runtime library rpcrt4.dll during
the parsing of RPC-level authentication messages. When parsing packets
with the authentication type of NTLMSSP and the authentication level of
PACKET, an invalid memory dereference can occur if the verification
trailer signature is initialized to 0 as opposed to the standard NTLM
signature. Successful exploitation crashes the RPC service and
subsequently the entire operating system.

Vendor Response:
Microsoft has issued an update to correct this vulnerability. More details
can be found at:
<http://www.microsoft.com/technet/security/bulletin/ms07-058.mspx>
http://www.microsoft.com/technet/security/bulletin/ms07-058.mspx

Disclosure Timeline:
2007.02.05 - Vulnerability reported to vendor
2007.10.09 - Digital Vaccine released to TippingPoint customers
2007.10.10 - Coordinated public release of advisory

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2228>
CVE-2007-2228


ADDITIONAL INFORMATION

The information has been provided by <mailto:zdi-disclosures@xxxxxxxx>
The Zero Day Initiative (ZDI).
The original article can be found at:
<http://www.zerodayinitiative.com/advisories/ZDI-07-055.html>
http://www.zerodayinitiative.com/advisories/ZDI-07-055.html



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