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ZDI-07-055: Microsoft Windows DCERPC Authentication Denial of Service Vulnerability
ZDI-07-055: Microsoft Windows DCERPC Authentication Denial of Service
October 10, 2007
-- CVE ID:
-- Affected Vendor:
-- Affected Products:
Windows 2000 SP4
Windows XP SP2
Windows 2003 SP1
-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability since October 9, 2007 by Digital Vaccine protection
filter ID 5657. For further product information on the TippingPoint IPS:
-- Vulnerability Details:
This vulnerability allows remote attackers to crash systems with
vulnerable installations of the Microsoft Windows operating system.
Authentication is not required to exploit this vulnerability.
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:
-- 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
This vulnerability was discovered by Tenable Network Security.
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