----------------------------------------------------------------------

Bist Du interessiert an einem neuen Job in IT-Sicherheit?


Secunia hat zwei freie Stellen als Junior und Senior Spezialist in IT-
Sicherheit:
http://secunia.com/secunia_vacancies/

----------------------------------------------------------------------

TITLE:
Microsoft Windows Telephony Service Vulnerability

SECUNIA ADVISORY ID:
SA16354

VERIFY ADVISORY:
http://secunia.com/advisories/16354/

CRITICAL:
Moderately critical

IMPACT:
Privilege escalation, System access

WHERE:
>From local network

OPERATING SYSTEM:
Microsoft Windows 2000 Advanced Server
http://secunia.com/product/21/
Microsoft Windows 2000 Datacenter Server
http://secunia.com/product/1177/
Microsoft Windows 2000 Professional
http://secunia.com/product/1/
Microsoft Windows 2000 Server
http://secunia.com/product/20/
Microsoft Windows 98
http://secunia.com/product/12/
Microsoft Windows 98 Second Edition
http://secunia.com/product/13/
Microsoft Windows Millenium
http://secunia.com/product/14/
Microsoft Windows Server 2003 Datacenter Edition
http://secunia.com/product/1175/
Microsoft Windows Server 2003 Enterprise Edition
http://secunia.com/product/1174/
Microsoft Windows Server 2003 Standard Edition
http://secunia.com/product/1173/
Microsoft Windows Server 2003 Web Edition
http://secunia.com/product/1176/
Microsoft Windows XP Home Edition
http://secunia.com/product/16/
Microsoft Windows XP Professional
http://secunia.com/product/22/

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/details.aspx?FamilyId=C7417EA1-7AFC-4A55-95DC-E814975B8AE6

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

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

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

Microsoft Windows Server 2003 (for Itanium-based systems):
http://www.microsoft.com/downloads/details.aspx?FamilyId=BC16BEAE-0BAD-490C-A80F-4BF81C360CA0
  
Microsoft Windows Server 2003 x64 Edition:
http://www.microsoft.com/downloads/details.aspx?FamilyId=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.

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

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------