Microsoft Security Bulletin MS15-002 - Critical

Vulnerability in Windows Telnet Service Could Allow Remote Code Execution (3020393)

Published: January 13, 2015

Version: 1.0

This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if an attacker sends specially crafted packets to an affected Windows server. Only customers who enable this service are vulnerable. By default, Telnet is installed but not enabled on Windows Server 2003. Telnet is not installed by default on Windows Vista and later operating systems.

This security update is rated Critical for all supported releases of Microsoft Windows. For more information, see the Affected Software section.

The security update addresses the vulnerability by correcting how Telnet validates user input. For more information about the vulnerability, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3020393.

 

The following software versions or editions are affected. Versions or editions that are not listed are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle.

Operating System

Maximum Security Impact

Aggregate Severity Rating

Updates Replaced

Windows Server 2003

Windows Server 2003 Service Pack 2
(3020393)

Remote Code Execution

Critical

None

Windows Server 2003 x64 Edition Service Pack 2
(3020393)

Remote Code Execution

Critical

None

Windows Server 2003 with SP2 for Itanium-based Systems
(3020393)

Remote Code Execution

Critical

None

Windows Vista

Windows Vista Service Pack 2
(3020393)

Remote Code Execution

Critical

None

Windows Vista x64 Edition Service Pack 2
(3020393)

Remote Code Execution

Critical

None

Windows Server 2008

Windows Server 2008 for 32-bit Systems Service Pack 2
(3020393)

Remote Code Execution

Critical

None

Windows Server 2008 for x64-based Systems Service Pack 2
(3020393)

Remote Code Execution

Critical

None

Windows Server 2008 for Itanium-based Systems Service Pack 2
(3020393)

Remote Code Execution

Critical

None

Windows 7

Windows 7 for 32-bit Systems Service Pack 1
(3020393)

Remote Code Execution

Critical

None

Windows 7 for x64-based Systems Service Pack 1
(3020393)

Remote Code Execution

Critical

None

Windows Server 2008 R2

Windows Server 2008 R2 for x64-based Systems Service Pack 1
(3020393)

Remote Code Execution

Critical

None

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(3020393)

Remote Code Execution

Critical

None

Windows 8 and Windows 8.1

Windows 8 for 32-bit Systems
(3020393)

Remote Code Execution

Critical

None

Windows 8 for x64-based Systems
(3020393)

Remote Code Execution

Critical

None

Windows 8.1 for 32-bit Systems
(3020393)

Remote Code Execution

Critical

None

Windows 8.1 for x64-based Systems
(3020393)

Remote Code Execution

Critical

None

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
(3020393)

Remote Code Execution

Critical

None

Windows Server 2012 R2
(3020393)

Remote Code Execution

Critical

None

Server Core installation option

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(3020393)

Remote Code Execution

Critical

None

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(3020393)

Remote Code Execution

Critical

None

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(3020393)

Remote Code Execution

Critical

None

Windows Server 2012 (Server Core installation)
(3020393)

Remote Code Execution

Critical

None

Windows Server 2012 R2 (Server Core installation)
(3020393)

Remote Code Execution

Critical

None

[1]This update is available via Windows Update only.

 

The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the January bulletin summary.

Vulnerability Severity Rating and Maximum Security Impact by Affected Software

Affected Software

Windows Telnet Service Buffer Overflow Vulnerability - CVE--2015-0014

Aggregate Severity Rating

Windows Server 2003

Windows Server 2003 Service Pack 2
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2003 x64 Edition Service Pack 2
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2003 with SP2 for Itanium-based Systems
(3020393)

Critical 
Remote Code Execution

Critical

Windows Vista

Windows Vista Service Pack 2
(3020393)

Critical 
Remote Code Execution

Critical

Windows Vista x64 Edition Service Pack 2
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2008

Windows Server 2008 for 32-bit Systems Service Pack 2
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2008 for x64-based Systems Service Pack 2
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2008 for Itanium-based Systems Service Pack 2
(3020393)

Critical 
Remote Code Execution

Critical

Windows 7

Windows 7 for 32-bit Systems Service Pack 1
(3020393)

Critical 
Remote Code Execution

Critical

Windows 7 for x64-based Systems Service Pack 1
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2008 R2

Windows Server 2008 R2 for x64-based Systems Service Pack 1
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(3020393)

Critical 
Remote Code Execution

Critical

Windows 8 and Windows 8.1

Windows 8 for 32-bit Systems
(3020393)

Critical 
Remote Code Execution

Critical

Windows 8 for x64-based Systems
(3020393)

Critical 
Remote Code Execution

Critical

Windows 8.1 for 32-bit Systems
(3020393)

Critical 
Remote Code Execution

Critical

Windows 8.1 for x64-based Systems
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2012 and Windows Server 2012 R2

Windows Server 2012
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2012 R2
(3020393)

Critical 
Remote Code Execution

Critical

Server Core installation option

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2012 (Server Core installation)
(3020393)

Critical 
Remote Code Execution

Critical

Windows Server 2012 R2 (Server Core installation)
(3020393)

Critical 
Remote Code Execution

Critical

 

Windows Telnet Service Buffer Overflow Vulnerability - CVE-2015-0014

A buffer overflow vulnerability exists in Windows Telnet service that could allow remote code execution. The vulnerability is caused when the Telnet service improperly validates user input. An attacker could attempt to exploit this vulnerability by sending specially crafted telnet packets to a Windows server, and if successful, could then run arbitrary code on the server. The update addresses the vulnerability by correcting how Telnet validates user input.

Microsoft received information about this vulnerability through coordinated vulnerability disclosure. When this security bulletin was originally issued Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers.

Mitigating Factors

The following mitigating factors may be helpful in your situation:

  • By default, Telnet is installed but not enabled on Windows Server 2003. Only customers who enable this service are vulnerable.
  • By default, Telnet is not installed on Windows Vista and later operating systems. Only customers who manually install and enable this service are vulnerable.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

For Security Update Deployment information, see the Microsoft Knowledge Base article referenced here in the Executive Summary.

Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgments for more information.

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

  • V1.0 (January 13, 2015): Bulletin published.

Page generated 2015-01-14 13:48Z-08:00.
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