Title: Microsoft Windows CSRSS CSRFinalizeContext Local Privilege Escalation Vulnerability
Severity: HIGH
Description:
Microsoft Windows CSRSS (client/server run-time subsystem) is the user-mode portion of the Win32 subsystem. CSRSS is a required service for Windows and is always running.
CSRSS is prone to a local privilege-escalation vulnerability becaue it fails to adequately marshal system resources when handling connections during process startups and stops.
Specifically, this vulnerability resides in the 'CSRSRV.DLL' library because it assumes processes will make only one 'ApiPort' connection. Connection counters are not incremented on new ALPC 'ApiPort' connections, but can be decremented when connections are closed. An attacker can leverage this vulnerability to corrupt the client process structure, gain control of memory, and execute arbitrary code.
Successful attacks will result in the complete compromise of affected computers.
Affected Products:
- Avaya Agent Access
- Avaya Basic Call Management System Reporting Desktop
- Avaya Basic Call Management System Reporting Desktop server
- Avaya CMS Supervisor
- Avaya CVLAN
- Avaya Computer Telephony
- Avaya Contact Center Express
- Avaya Customer Interaction Express (CIE) Server 1.0
- Avaya Customer Interaction Express (CIE) User Interface 1.0
- Avaya Enterprise Management
- Avaya IP Agent
- Avaya IP Softphone
- Avaya Integrated Management
- Avaya Interaction Center
- Avaya Interaction Center - Voice Quick Start
- Avaya Messaging Application Server
- Avaya Messaging Application Server MM 2.0
- Avaya Messaging Application Server MM 3.0
- Avaya Messaging Application Server MM 3.1
- Avaya Modular Messaging (MAS)
- Avaya Network Reporting
- Avaya OctelAccess(r) Server
- Avaya OctelDesignerTM
- Avaya Operational Analyst
- Avaya Outbound Contact Management
- Avaya Speech Access
- Avaya Unified Communication Center
- Avaya Unified Messenger (r)
- Avaya VPNmanagerTM Console
- Avaya Visual Messenger TM
- Avaya Visual Vector Client
- Avaya Web Messenger
- HP Storage Management Appliance 2.1
- HP Storage Management Appliance I
- HP Storage Management Appliance II
- HP Storage Management Appliance III
- Microsoft Windows Vista Business
- Microsoft Windows Vista Enterprise
- Microsoft Windows Vista Home Basic
- Microsoft Windows Vista Home Premium
- Microsoft Windows Vista Ultimate
- Microsoft Windows Vista x64 Edition
- Nortel Networks Centrex IP Client Manager 7.0.0
- Nortel Networks Centrex IP Client Manager 8.0.0
- Nortel Networks Centrex IP Client Manager 9.0
References:
- Avaya: ASA-2007-159 MS07-021 Vulnerabilities in CSRSS Could Allow Remote Code Execution
- Microsoft: Knowledge Base Article 930178
- Microsoft: Microsoft Security Bulletin MS07-021
- Microsoft: Microsoft Windows Homepage
- Nortel: [ SECURITY ADVISORY ] Centrex IP Client Manager (CICM) response to Microsoft Apr
- US-CERT: Vulnerability Note VU#219848 Microsoft Windows Vista CSRSS privilege escalation
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