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CA-2003-16 Buffer Overflow in Microsoft RPC
release date: July 17, 2003
Last revised: --
revision history is at the end of this file.
Windows NT 4.0
* Microsoft Windows NT 4.0 Terminal Services Edition
* Microsoft Windows 2000
* Microsoft Windows XP
* Microsoft Windows Server 2003
overflow vulnerability exists in Microsoft's Remote Procedure
Call (RPC) implementation. A remote attacker could exploit this
vulnerability to execute arbitrary code or cause a denial of service.
is a buffer overflow in Microsoft's RPC implementation.
According to Microsoft Security Bulletin MS03-026, "There is a
vulnerability in the part of RPC that deals with message exchange over
TCP/IP. The failure results because of incorrect handling of malformed
messages. This particular vulnerability affects a Distributed
Component Object Model (DCOM) interface with RPC, which listens on
TCP/IP port 135. This interface handles DCOM object activation
requests that are sent by client machines (such as Universal Naming
Convention (UNC) paths) to the server."
is tracking this issue as VU#568148. This reference number
corresponds to CVE candidate CAN-2003-0352.
attacker could exploit this vulnerability to execute
arbitrary code with Local System privileges or to cause a denial of
the appropriate patch as specified by Microsoft Security
wish to block access from outside your network perimeter,
specifically by blocking access to port 135/TCP. This will limit your
exposure to attacks. However, blocking at the network perimeter would
still allow attackers within the perimeter of your network to exploit
the vulnerability. It is important to understand your network's
configuration and service requirements before deciding what changes
was discovered by The Last Stage of Delirium
Research Group. Microsoft has published Microsoft Security Bulletin
MS03-026, upon which this document is largely based.
Ian A. Finlay
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2003 Carnegie Mellon University.
July 17, 2003: Initial release
Version: PGP 6.5.8
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