Advisory Details

October 10th, 2007

Microsoft Windows DCERPC Authentication Denial of Service Vulnerability

ZDI-07-055
ZDI-CAN-164

CVE ID CVE-2007-2228
CVSS SCORE
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows 2000 SP4
Windows XP SP2
Windows 2003 SP1
Windows Vista
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 5657. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
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.

ADDITIONAL DETAILS 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
  • 2007-10-10 - Coordinated public release of advisory
CREDIT Tenable Network Security
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