[NT] Locator Service Buffer Overflow Vulnerability

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From: support@securiteam.com
To: list@securiteam.com
Date: 30 Jan 2003 17:53:25 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Locator Service Buffer Overflow Vulnerability
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SUMMARY

There is a remotely exploitable buffer overflow vulnerability in the
Microsoft RPC (Remote Procedure Call) Locator Service on Windows
platforms. The RPC Locator Service maintains a list of RPC services and
servers on the network. Typically only domain controllers run the Locator
service by default and these machines are the most at risk.

DETAILS

When searching for RPC Services on the network a Windows RPC client will
connect to the domain controller over TCP port 139/445 (the SMB ports) and
search for services/servers through the "locator" named pipe. An attacker
can overflow a stack-based buffer in the Locator service process by
searching for an overly long string for an entry name to use in looking
for binding handles. This problem arises due to an unsafe call to
wcscpy().

Fix Information:
NGSSoftware advised Microsoft to this problem at the end of October of
2002. Microsoft released the patch to resolve this issue last week.
<http://www.microsoft.com/security/security_bulletins/ms03-001.asp>
http://www.microsoft.com/security/security_bulletins/ms03-001.asp

ADDITIONAL INFORMATION

The information has been provided by <mailto:nisr@nextgenss.com>
NGSSoftware Insight Security Research.

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