CVE-2008-3269 in Winremotepc Full
Summary
by MITRE
WRPCServer.exe in WinSoftMagic WinRemotePC (WRPC) Lite 2008 and Full 2008 allows remote attackers to cause a denial of service (CPU consumption) via a crafted packet to TCP port 4321.
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Analysis
by VulDB Data Team • 11/02/2024
The vulnerability identified as CVE-2008-3269 affects WinSoftMagic WinRemotePC Lite 2008 and Full 2008 software components, specifically targeting the WRPCServer.exe service that operates on TCP port 4321. This represents a classic denial of service weakness where malicious actors can exploit a flaw in the packet processing logic to consume excessive CPU resources, effectively rendering the targeted system unavailable to legitimate users. The vulnerability stems from inadequate input validation within the remote desktop server implementation, creating a condition where malformed or specially crafted network packets can trigger uncontrolled resource consumption patterns. This type of vulnerability aligns with CWE-400, which categorizes unchecked resource consumption as a fundamental weakness in software design that can lead to system instability and service disruption.
The technical exploitation of this vulnerability occurs when an attacker sends a malformed packet to the designated TCP port 4321, which is the default communication port for WinRemotePC services. The WRPCServer.exe process fails to properly validate incoming packet structures, allowing the malformed data to be processed in a way that causes the CPU utilization to spike continuously. This occurs because the server implementation lacks proper bounds checking and input sanitization mechanisms, leading to a condition where the processing loop becomes trapped in an infinite or near-infinite cycle. The vulnerability is particularly concerning as it requires no authentication or prior access to the system, making it a remote attack vector that can be exploited from any location on the network.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the overall availability and performance of systems running the affected software. When exploited successfully, the CPU consumption can reach near 100% utilization, causing legitimate users to experience service timeouts and connection failures. Network administrators may observe unusual system behavior including slow response times, application crashes, and complete service unavailability. The vulnerability can be particularly damaging in enterprise environments where remote desktop services are critical for system administration and user access. From a cybersecurity perspective, this vulnerability can serve as a precursor to more sophisticated attacks, as the system instability created by the denial of service can mask other malicious activities or provide an opportunity for privilege escalation attempts.
Mitigation strategies for CVE-2008-3269 should include immediate network segmentation and firewall rule implementation to block access to TCP port 4321 from untrusted networks. Organizations should also consider implementing intrusion detection systems that can identify unusual packet patterns targeting this specific port. The most effective long-term solution involves updating to patched versions of WinRemotePC software or migrating to alternative remote access solutions that have been properly vetted for security vulnerabilities. Network monitoring should be enhanced to detect unusual CPU consumption patterns that might indicate exploitation attempts, and system administrators should establish baseline performance metrics to quickly identify when services are being degraded. This vulnerability demonstrates the critical importance of input validation and resource management in server applications, aligning with ATT&CK technique T1499 which covers denial of service attacks and the broader category of resource exhaustion attacks that can undermine system availability.