CVE-2011-5125 in Director
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Blue Coat Director before 5.5.2.3 allows remote attackers to inject arbitrary web script or HTML via vectors involving the HTTP TRACE method.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 02/20/2019
The CVE-2011-5125 vulnerability represents a critical cross-site scripting flaw discovered in Blue Coat Director software versions prior to 5.5.2.3. This vulnerability specifically leverages the HTTP TRACE method to execute malicious code within the context of a user's browser session. The flaw exists within the web application's handling of HTTP TRACE requests, which are typically used for debugging network issues and tracing request paths through proxy servers. When the Blue Coat Director application processes these TRACE requests without proper input validation or sanitization, it creates an opening for remote attackers to inject malicious scripts that can be executed by unsuspecting users who interact with the affected system.
The technical implementation of this vulnerability stems from insufficient validation of user-supplied input that flows through the HTTP TRACE method. When an attacker crafts a malicious TRACE request containing script code, the application fails to properly sanitize this input before rendering it in the web interface. This allows the injected code to execute within the browser context of authenticated users, potentially leading to session hijacking, data theft, or further exploitation of the compromised system. The vulnerability is classified under CWE-79 as a failure to sanitize input before embedding it in a web page, specifically manifesting as a cross-site scripting attack. The flaw demonstrates a classic lack of proper output encoding and input validation mechanisms that should be implemented to prevent malicious content from being interpreted as executable code.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to perform sophisticated attacks against authenticated users within the Blue Coat Director environment. Attackers can leverage this vulnerability to steal session cookies, redirect users to malicious sites, or even execute commands on behalf of the victim user. The attack vector is particularly concerning because TRACE methods are often permitted in proxy configurations and may not be properly filtered or sanitized by the application layer. This vulnerability affects organizations that rely on Blue Coat Director for web traffic management and security monitoring, potentially compromising the integrity of their security infrastructure. The threat landscape for this vulnerability aligns with ATT&CK technique T1566.001 which involves credential access through social engineering and web-based attacks, and T1059.007 which covers script execution through web shells or malicious scripts.
Mitigation strategies for CVE-2011-5125 require immediate implementation of the vendor-provided patch version 5.5.2.3 or subsequent releases that address the input validation issues in the HTTP TRACE method handling. Organizations should also implement network-level controls to disable TRACE methods where possible, as recommended by the OWASP Web Application Security Project guidelines. Additional protective measures include implementing proper input sanitization, output encoding, and Content Security Policy headers to prevent script execution even if the vulnerability is exploited. Security teams should conduct thorough vulnerability assessments to identify any other applications or systems that might be similarly affected by improper handling of HTTP TRACE requests. Regular security monitoring and log analysis should be enhanced to detect unusual TRACE method usage patterns that might indicate exploitation attempts. The vulnerability underscores the importance of maintaining current security patches and implementing defense-in-depth strategies to protect against web application vulnerabilities that could compromise entire network security infrastructures.