[NT] Locator Service Buffer Overflow Vulnerability

From: support@securiteam.com
Date: 01/30/03

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Date: 30 Jan 2003 17:53:25 +0200

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      Locator Service Buffer Overflow Vulnerability
    ------------------------------------------------------------------------

    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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