CVE-2000-0324 in pcAnywhere
Summary
by MITRE
pcAnywhere 8.x and 9.0 allows remote attackers to cause a denial of service via a TCP SYN scan, e.g. by nmap.
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Analysis
by VulDB Data Team • 03/15/2025
The vulnerability described in CVE-2000-0324 represents a significant security flaw in Symantec pcAnywhere versions 8.x and 9.0 that exposes the software to remote denial of service attacks. This vulnerability specifically targets the network protocol handling mechanisms within pcAnywhere, creating a condition where legitimate network traffic can be exploited to disrupt service availability. The flaw enables attackers to perform TCP SYN scans using tools like nmap against pcAnywhere servers, which then triggers the denial of service condition.
The technical nature of this vulnerability stems from improper handling of TCP connection requests within the pcAnywhere software implementation. When a TCP SYN scan is conducted against the pcAnywhere service, the application fails to properly manage the connection state transitions and does not implement adequate rate limiting or connection validation mechanisms. This improper state management creates a scenario where the service becomes overwhelmed by connection attempts and eventually becomes unresponsive to legitimate users. The vulnerability operates at the network protocol level, specifically targeting the TCP three-way handshake process that establishes connections.
From an operational impact perspective, this vulnerability poses serious risks to organizations that rely on pcAnywhere for remote system administration and support. A successful exploitation can render critical remote access services unavailable, potentially disrupting business operations and requiring manual intervention to restore service. The vulnerability is particularly concerning because it can be triggered by automated scanning tools, making it easy for attackers to exploit without requiring specialized knowledge or significant resources. This characteristic transforms what could be a minor inconvenience into a potential operational disruption that affects system availability and user productivity.
The vulnerability aligns with CWE-119 which addresses improper restriction of operations within a memory buffer, though in this case the issue manifests as improper connection handling rather than direct memory manipulation. From an ATT&CK framework perspective, this vulnerability corresponds to techniques related to denial of service and network reconnaissance, specifically covering the T1499.004 sub-technique for network denial of service and T1046 for network service scanning. Organizations should implement immediate mitigations including network segmentation, firewall rules to restrict access to pcAnywhere ports, and consideration of alternative remote access solutions. The most effective long-term solution involves upgrading to patched versions of pcAnywhere or migrating to more secure remote access technologies that properly handle connection state management and implement robust denial of service protection mechanisms.