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Credit:
The information has been provided by The Zero Day Initiative (ZDI).
The original article can be found at: http://www.zerodayinitiative.com/advisories/ZDI-07-055.html
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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
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:
CVE-2007-2228
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