CVE-2014-2595 in Web Application Firewall
Summary
by MITRE
Barracuda Web Application Firewall (WAF) 7.8.1.013 allows remote attackers to bypass authentication by leveraging a permanent authentication token obtained from a query string.
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Analysis
by VulDB Data Team • 08/08/2024
The vulnerability identified as CVE-2014-2595 affects the Barracuda Web Application Firewall version 7.8.1.013, presenting a critical security flaw that undermines the authentication mechanisms designed to protect web applications. This weakness enables remote attackers to bypass authentication controls by exploiting a permanent authentication token that can be extracted from the query string parameters of HTTP requests. The vulnerability represents a significant compromise in the security architecture of the WAF, as it allows unauthorized access to protected resources without proper authentication credentials.
The technical flaw stems from improper handling of authentication tokens within the WAF's processing pipeline. When legitimate users authenticate to the system, the WAF generates authentication tokens that should be securely managed and validated. However, in this specific version, the system fails to properly validate the source and integrity of authentication tokens when they are passed through query strings. This design oversight creates an attack vector where malicious actors can capture valid tokens from query parameters and reuse them to gain unauthorized access to protected web applications. The permanent nature of these tokens means they remain valid for extended periods, amplifying the potential impact of the vulnerability.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it fundamentally undermines the trust model that web application firewalls are designed to maintain. Attackers can exploit this weakness to bypass security controls that are supposed to protect sensitive data, user accounts, and business-critical applications. The remote nature of the attack means that threat actors do not require physical access to the network or system, making the vulnerability particularly dangerous in environments where WAFs are deployed to protect publicly accessible web applications. This weakness can lead to data breaches, unauthorized data manipulation, and potential compromise of entire application ecosystems that rely on the WAF for protection.
Security professionals should implement immediate mitigations including patching the affected WAF version to the latest available release that addresses this authentication bypass vulnerability. Network administrators must also configure additional monitoring to detect suspicious query string patterns that may indicate exploitation attempts. The vulnerability aligns with CWE-287, which addresses improper authentication issues in software systems, and maps to ATT&CK technique T1078 for valid accounts and T1190 for exploitation of remote services. Organizations should conduct comprehensive security assessments to identify any other instances where authentication tokens might be exposed through query strings, and implement proper token validation mechanisms that verify the integrity and origin of authentication tokens regardless of their transmission method. The incident highlights the critical importance of proper authentication token management and the need for robust input validation in web application security controls.