CVE-2013-2641 in Web Appliance
Summary
by MITRE
Directory traversal vulnerability in patience.cgi in Sophos Web Appliance before 3.7.8.2 allows remote attackers to read arbitrary files via the id parameter.
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Analysis
by VulDB Data Team • 05/08/2026
The vulnerability identified as CVE-2013-2641 represents a critical directory traversal flaw within the Sophos Web Appliance software, specifically affecting versions prior to 3.7.8.2. This issue resides in the patience.cgi component which is part of the web application's file handling mechanisms. The vulnerability stems from inadequate input validation and sanitization processes that fail to properly restrict user-supplied data before using it to access system files. Attackers can exploit this weakness by manipulating the id parameter to navigate through the file system hierarchy and access sensitive files that should remain protected from unauthorized access. The flaw directly enables arbitrary file reading capabilities, potentially exposing confidential information including system configuration files, user credentials, and other sensitive data stored on the appliance.
The technical implementation of this vulnerability aligns with CWE-22, which categorizes directory traversal attacks as a fundamental weakness in input validation and access control mechanisms. The vulnerability operates by accepting user-provided input through the id parameter without proper sanitization or validation, allowing malicious actors to inject sequences such as ../ that traverse up the directory structure. When the patience.cgi script processes this input, it fails to implement proper path validation or canonicalization, enabling attackers to construct malicious file paths that bypass normal access controls. This type of vulnerability is particularly dangerous because it can be exploited remotely without requiring authentication, making it an attractive target for attackers seeking to gather intelligence or escalate privileges within the affected system.
The operational impact of CVE-2013-2641 extends beyond simple information disclosure, as it can enable further exploitation and compromise of the affected web appliance. An attacker who successfully exploits this vulnerability can potentially access system files that contain sensitive configuration data, authentication credentials, or other confidential information that could be used for additional attacks against the network or system. The vulnerability creates a persistent security risk that can be exploited repeatedly, as the flaw exists in the core file access mechanisms of the appliance. Organizations running affected versions of the Sophos Web Appliance face significant risk of unauthorized data access and potential system compromise, particularly in environments where the appliance serves as a critical security control or gateway.
Mitigation strategies for this vulnerability primarily involve applying the vendor-supplied patch or upgrade to Sophos Web Appliance version 3.7.8.2 or later, which addresses the directory traversal flaw through proper input validation and sanitization mechanisms. Network administrators should implement immediate patch management procedures to ensure all affected appliances are updated promptly. Additional defensive measures include implementing web application firewalls that can detect and block malicious directory traversal attempts, configuring proper access controls to limit the impact of any successful exploitation, and monitoring system logs for suspicious file access patterns. The remediation process should also include reviewing and strengthening input validation processes across all web applications, implementing proper path canonicalization techniques, and establishing regular security assessments to identify similar vulnerabilities in other system components. Organizations should also consider implementing principle of least privilege access controls and regular security audits to prevent similar weaknesses from emerging in other parts of their infrastructure.