CVE-2005-0814 in lsh
Summary
by MITRE
Unknown vulnerability in lshd in Lysator LSH 1.x and 2.x before 2.0.1 allows remote attackers to cause a denial of service via unknown vectors.
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Analysis
by VulDB Data Team • 06/06/2019
The vulnerability identified as CVE-2005-0814 affects the lshd daemon component within Lysator LSH versions 1.x and 2.x prior to 2.0.1. This represents a denial of service flaw that enables remote attackers to disrupt service availability without requiring authentication or privileged access. The LSH daemon serves as the Secure Shell implementation for the Lysator project, which provides secure remote access capabilities for Unix-like systems. The vulnerability manifests through unspecified attack vectors that allow adversaries to compromise the daemon's operational integrity and availability. Given that this affects core network services, the potential impact extends beyond simple service disruption to encompass broader system reliability concerns.
The technical nature of this vulnerability falls under the category of denial of service attacks, where the flaw enables remote exploitation without requiring special privileges or authentication. According to CWE classification, this vulnerability would likely map to CWE-400: Uncontrolled Resource Consumption or CWE-1321: Improper Handling of Exceptional Conditions. The vulnerability stems from inadequate input validation or resource management within the lshd daemon implementation, creating opportunities for malformed data or excessive resource consumption that causes the service to become unresponsive or crash entirely. The unspecified nature of the attack vectors suggests potential weaknesses in protocol handling, memory management, or connection state processing.
From an operational perspective, this vulnerability creates significant risk for systems relying on Lysator LSH for secure remote access. Remote attackers can exploit this weakness to render the SSH service unavailable to legitimate users, potentially disrupting critical business operations or administrative access to systems. The impact extends beyond immediate service disruption to include potential business continuity implications, as administrators may need to restart services or implement emergency patches. Organizations with multiple systems running affected versions of Lysator LSH face elevated risk, particularly those with limited network segmentation or inadequate monitoring capabilities. The vulnerability's remote exploitability means that attackers can target systems from anywhere on the network without requiring physical access or local credentials.
Mitigation strategies for CVE-2005-0814 should prioritize immediate patching of affected systems to version 2.0.1 or later of Lysator LSH. Organizations should implement network monitoring to detect unusual connection patterns or service disruptions that may indicate exploitation attempts. Security teams should also consider implementing temporary network restrictions or firewall rules to limit access to the affected daemon ports until patches are deployed. Additionally, system administrators should conduct comprehensive vulnerability assessments to identify all instances of affected software across their infrastructure. The ATT&CK framework would categorize this vulnerability under T1499.004: Endpoint Denial of Service, with potential lateral movement implications if attackers use the service disruption as a precursor to more sophisticated attacks. Regular security updates and patch management procedures should be reinforced to prevent similar vulnerabilities from remaining unaddressed in the future.