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Microsoft Windows Telephony Service Vulnerability
Secunia Advisory: SA16354
Release Date: 2005-08-09
Last Update: 2005-11-21
Popularity: 14,041 views

Critical:
Moderately critical
Impact: Privilege escalation
System access
Where: From local network
Solution Status: Vendor Patch

OS:Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Server
Microsoft Windows 98
Microsoft Windows 98 Second Edition
Microsoft Windows Millenium
Microsoft Windows Server 2003 Datacenter Edition
Microsoft Windows Server 2003 Enterprise Edition
Microsoft Windows Server 2003 Standard Edition
Microsoft Windows Server 2003 Web Edition
Microsoft Windows XP Embedded
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional

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CVE reference:CVE-2005-0058


Description:
A vulnerability has been reported in Microsoft Windows, which can be exploited by malicious, local users to gain escalated privileges or by malicious people to compromise a vulnerable system.

The vulnerability is caused due to an unspecified error in the TAPI (Telephony Application Programming Interface) service when validating permissions and the length of certain messages before copying the data to an allocated buffer.

Successful exploitation allows malicious, local users to gain escalated privileges. On certain configurations of Windows 2000 Server and Windows Server 2003 with the Telephony service enabled (disabled by default), it is also possible to exploit the vulnerability without a local account. However, only authenticated users can access the service on Windows Server 2003 and hence exploit the vulnerability.

Solution:
Apply patches.

Microsoft Windows 2000 (requires SP4):
http://www.microsoft.com/downloads/de...=C7417EA1-7AFC-4A55-95DC-E814975B8AE6

Microsoft Windows XP (requires SP1 or SP2):
http://www.microsoft.com/downloads/de...=B049004B-AF28-41D7-8AE6-7A3DB15211F1

Microsoft Windows XP Professional x64 Edition:
http://www.microsoft.com/downloads/de...=705545D0-B53B-4E17-8B62-A4C652697C61

Microsoft Windows XP Embedded (with SP2):
http://www.microsoft.com/downloads/de...=9da5dae9-9e2d-45ef-8c9b-d773409b6187

Microsoft Windows XP Embedded (with SP1):
http://www.microsoft.com/downloads/de...=8f1f7ae2-8e47-4055-9f55-aef72d8ea60d

Microsoft Windows Server 2003:
http://www.microsoft.com/downloads/de...=0097FE14-1D6B-4423-A437-DEA1ED665A07

Microsoft Windows Server 2003 (for Itanium-based systems):
http://www.microsoft.com/downloads/de...=BC16BEAE-0BAD-490C-A80F-4BF81C360CA0

Microsoft Windows Server 2003 x64 Edition:
http://www.microsoft.com/downloads/de...=0CEF9CC2-A7BD-42E0-81B1-EDC303DA8A40

Microsoft Windows 98, Microsoft Windows 98 SE, and Microsoft Windows ME:
The vendor will not be releasing patches, as the vulnerability isn't considered critical on these versions.

Provided and/or discovered by:
The vendor credits Kostya Kortchinsky, CERT Renater.

Changelog:
2005-11-21: Added patch information for Windows XP Embedded.

Original Advisory:
MS05-40 (KB893756):
http://www.microsoft.com/technet/security/Bulletin/MS05-040.mspx


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