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Vulnerability:Win/MSRPC.LLS.RCE!CAN-2005-0050

Severity rating
Critical

Class/Type
Vulnerability

Discovered date
2005-02-08T00:00:00

Attack vector
Remote

Authentication required
No

Public exploits available
Yes

Signature detection
Medium



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Description

A remote code execution vulnerability exists in the License Logging service.



Impact

An attacker who successfully exploited this vulnerability could take complete control of the affected system. The vulnerability, if exploited, could allow an attacker to cause the License Logging service on Windows Server 2003 to stop responding to all requests.



Technical details (analysis)

The License Logging service is a tool that was originally designed to help customers manage licenses for the Microsoft server products that are licensed in the Server Client Access License (CAL) model. License Logging service is one of the services used by Windows Small Business Server 2003 or earlier to manage CALs. A buffer overrun occurs in LLS service that can be exploited via \\pipe\llsrpc named pipe with a a crafted packet.



Affected software

Microsoft Windows NT Server 4.0 Service Pack 6a
Microsoft Windows NT Server 4.0 Terminal Server Edition Service Pack 6
Microsoft Windows 2000 Server Service Pack 3 and Microsoft Windows 2000 Server Service Pack 4
Microsoft Windows Server 2003
Microsoft Windows Server 2003 for Itanium-based Systems



Non-affected software

Microsoft Windows 2000 Professional Service Pack 3
Microsoft Windows 2000 Professional Service Pack 4
Microsoft Windows XP Service Pack 1 and Microsoft Windows XP Service Pack 2
Microsoft Windows XP 64-Bit Edition Service Pack 1 (Itanium)
Microsoft Windows XP 64-Bit Edition Version 2003 (Itanium)
Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and Microsoft Windows Millennium Edition (ME)



References




Solutions




NIS signature

Name: Vulnerability:Win/MSRPC.LLS.RCE!CAN-2005-0050
Release Date: 2005-02-08T00:00:00



Known false positives

No known false positives at this time.



Work-arounds

Disable the License Logging service.
Use the Group Policy settings to disable License Logging Service on all affected systems that do not require this feature.
On Windows NT Server 4.0 Service Pack 6a, Windows NT Server 4.0 Terminal Server Edition Service Pack 6, and Windows 2000 Server Service Pack 3 remove the License Logging service from the NullSessionPipes registry key.
Use a personal firewall, such as the Internet Connection Firewall, which is included with Windows Server 2003.
Block TCP ports 139 and 445 at the firewall.
Run the Configure E-mail and Internet Connection Wizard.
Enable advanced TCP/IP filtering on systems that support this feature.
Block the affected ports by using IPSec on the affected systems.