CVE-2005-3322 in Linux
Summary
by MITRE
Unspecified vulnerability in Squid on SUSE Linux 9.0 allows remote attackers to cause a denial of service (crash) via HTTPs (SSL).
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Analysis
by VulDB Data Team • 06/06/2019
The vulnerability identified as CVE-2005-3322 represents a critical security flaw within the Squid proxy server software running on SUSE Linux 9.0 systems. This unspecified vulnerability specifically targets the HTTPS (SSL) handling functionality of the Squid proxy, creating a potential avenue for remote attackers to execute denial of service attacks. The issue stems from inadequate input validation or processing of SSL/TLS connections within the Squid proxy implementation, which can be exploited to crash the service and render it unavailable to legitimate users. Such vulnerabilities in proxy infrastructure are particularly concerning as they can disrupt network connectivity and access to web resources for entire organizational networks relying on the proxy for internet access.
The technical nature of this vulnerability involves the manipulation of SSL/TLS protocol handling within Squid's HTTPs processing pipeline. Attackers can craft specially formatted SSL connections or requests that trigger memory corruption, buffer overflows, or other internal processing errors within the Squid proxy daemon. This typically occurs when the proxy receives malformed SSL handshakes, certificate data, or encrypted traffic that it cannot properly parse or handle. The flaw likely resides in the SSL/TLS negotiation code or certificate validation routines, where insufficient boundary checks or improper error handling leads to memory corruption that results in process termination. According to CWE classification, this vulnerability would fall under CWE-125: Out-of-bounds Read or CWE-119: Memory Corruption, depending on the specific implementation flaw. The attack vector is remote and requires no authentication, making it particularly dangerous as it can be exploited by anyone with network access to the affected system.
The operational impact of CVE-2005-3322 extends far beyond a simple service disruption, as it can severely compromise network availability and business continuity for organizations relying on Squid proxy services. When exploited successfully, the vulnerability causes the Squid proxy to crash and restart, leading to temporary loss of internet connectivity for all users dependent on that proxy server. This can result in significant productivity losses, particularly in enterprise environments where thousands of users may be affected simultaneously. Network administrators may experience increased monitoring overhead as they attempt to identify and respond to the service disruption, while users face interrupted access to web applications, email services, and other internet-based resources. The vulnerability also increases the attack surface for more sophisticated attacks, as the proxy service crash can serve as a distraction or precursor to other exploitation attempts. Organizations using the affected SUSE Linux 9.0 systems face potential regulatory compliance issues if the service disruption affects critical business operations or violates service level agreements.
Mitigation strategies for CVE-2005-3322 should prioritize immediate patching and system updates to address the underlying SSL processing flaw. Organizations must upgrade their Squid proxy installations to versions that contain fixes for the SSL/TLS handling vulnerabilities, typically through official SUSE security patches or updated package repositories. System administrators should implement network monitoring to detect unusual SSL traffic patterns that may indicate exploitation attempts, and establish automated alerting systems for proxy service crashes or restarts. Network segmentation and firewall rules can be configured to limit access to the vulnerable proxy server from untrusted networks, while implementing redundant proxy infrastructure can provide failover capabilities during exploitation attempts. Additionally, organizations should conduct regular security assessments of their proxy configurations and implement intrusion detection systems that can identify and block malicious SSL traffic patterns. From an ATT&CK framework perspective, this vulnerability relates to T1499.004: Endpoint Denial of Service and T1071.004: Application Layer Protocol, highlighting the need for both defensive measures and incident response procedures to handle such service disruption attacks effectively.