Published:
23 January 2003
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0045 -- Microsoft Security Bulletin MS03-001 Unchecked Buffer in Locator Service Could Lead to Code Execution (810833) 23 January 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Windows NT 4.0 Windows 2000 Windows XP Vendor: Microsoft Impact: Execute Arbitrary Code/Commands Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- - - ---------------------------------------------------------------------- Title: Unchecked Buffer in Locator Service Could Lead to Code Execution (810833) Date: 22 January, 2003 Software: Microsoft Windows NT 4.0, Windows 2000, and Windows XP Impact: Run code of the attacker's choice Max Risk: Critical Bulletin: MS03-001 Microsoft encourages customers to review the Security Bulletins at: http://www.microsoft.com/technet/security/bulletin/ms03-001.asp http://www.microsoft.com/security/security_bulletins/ms03-001.asp - - ---------------------------------------------------------------------- Issue: ====== The Microsoft Locator service is a name service that maps logical names to network-specific names. It ships with Windows NT 4.0, Windows 2000, and Windows XP. By default, the Locator service is enabled only on Windows 2000 domain controllers and Windows NT 4.0 domain controllers; it is not enabled on Windows NT 4.0 workstations or member servers, Windows 2000 workstations or member servers, or Windows XP. A security vulnerability results from an unchecked buffer in the Locator service. By sending a specially malformed request to the Locator service, an attacker could cause the Locator service to fail, or to run code of the attacker's choice on the system. Mitigating Factors: ==================== - The Locator service is not enabled by default on any affected versions of Windows with the exception of Windows 2000 domain controllers and Windows NT 4.0 domain controllers. - A properly-configured firewall would block the calls to the Locator service, which would protect an affected machine from an Internet-based attack. Risk Rating: ============ - Windows NT 4.0 (Workstations and Member Servers): Moderate - Windows NT 4.0 (Domain Controllers Only): Critical - Windows NT 4.0, Terminal Server Edition: Moderate - Windows 2000 (Workstations and Member Servers): Moderate - Windows 2000 (Domain Controllers Only): Critical - Windows XP: Moderate Patch Availability: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletins at http://www.microsoft.com/technet/security/bulletin/ms03-001.asp http://www.microsoft.com/security/security_bulletins/ms03-001.asp for information on obtaining this patch. Acknowledgment: =============== - David Litchfield of Next Generation Security Software Ltd. (http://www.nextgenss.com) - - --------------------------------------------------------------------- THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBPjAkTih9+71yA2DNAQHdrAP+JjrGFgkW6cPYmzyYtrIP1fM8HDayRTJw pOXQ2UcXEGO1Jprr0ytjFMgjydNu4YfhLrybANiJ03SWYpmZRSrYmpZgXCbxeOA0 A8rugAZ02SL0x3xqWiQ3VN4R9QC+a9TZByZucWHhAFJB3n8EbZuyknAgosCnIDpV gggu88zLwRQ= =yNo5 -----END PGP SIGNATURE-----