CVE-2008-0717 in WebSphere Edge Server
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Caching Proxy (CP) 5.1 through 6.1 in IBM WebSphere Edge Server, when CGI mapping rules are enabled, allows remote attackers to inject arbitrary web script or HTML via unspecified vectors that trigger injection into an error response.
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Analysis
by VulDB Data Team • 07/25/2024
The vulnerability identified as CVE-2008-0717 represents a critical cross-site scripting flaw within IBM WebSphere Edge Server's Caching Proxy component version 5.1 through 6.1. This security weakness specifically manifests when CGI mapping rules are configured and enabled within the server environment, creating a pathway for malicious actors to execute unauthorized code within the context of victim browsers. The vulnerability operates by exploiting the server's error response handling mechanism, where improperly sanitized input data can be injected into error messages displayed to users. This particular flaw falls under the CWE-79 category of Cross-Site Scripting, which is classified as a fundamental web application security weakness that enables attackers to inject malicious scripts into web pages viewed by other users. The attack vector leverages the server's failure to properly validate and sanitize user-supplied input that flows through the CGI mapping rules into error response generation, creating an environment where attacker-controlled script code can be executed within the browser context of legitimate users. The vulnerability is particularly concerning because it operates at the proxy level, meaning that compromised proxy servers can affect all traffic passing through them, potentially exposing numerous applications and users to script injection attacks.
The technical exploitation of this vulnerability requires an attacker to craft malicious input that triggers an error response within the WebSphere Edge Server when processing CGI requests. When CGI mapping rules are active, the server processes user input through these mappings and generates error responses that may contain unsanitized user data. The injection occurs during the error response generation phase, where the system fails to properly escape or filter special characters in the user-supplied data before rendering it in the error page. This creates a persistent XSS condition where the injected script code executes in the victim's browser context, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability demonstrates a classic input validation failure where the system assumes that all data from CGI mappings is safe without proper sanitization. The attack can be executed remotely without requiring authentication or special privileges, making it particularly dangerous in production environments where the proxy server handles sensitive traffic from multiple applications and users. This weakness represents a failure in the principle of least privilege and proper input sanitization, as the system should never trust user-provided data regardless of its source or intended processing path.
The operational impact of this vulnerability extends beyond simple script injection, as it can be leveraged for more sophisticated attacks within the context of the compromised web application environment. An attacker could potentially execute malicious scripts that steal session cookies, redirect users to phishing sites, or perform actions on behalf of authenticated users through session hijacking techniques. The proxy server nature of WebSphere Edge Server means that this vulnerability could affect multiple applications and services that rely on the same proxy infrastructure, creating a wide attack surface. The vulnerability's presence in versions 5.1 through 6.1 indicates a prolonged period of exposure, as organizations using these versions would have been potentially vulnerable for years. This flaw significantly undermines the security posture of affected organizations, as it provides attackers with a persistent means of injecting malicious code into web applications. The attack can be particularly effective in environments where users trust the proxy server and do not inspect error responses, allowing for stealthy exploitation. Additionally, the vulnerability can be combined with other attack vectors to create more complex exploitation scenarios, such as using the XSS to establish a foothold for further attacks within the network.
Organizations affected by CVE-2008-0717 should implement immediate mitigations to protect their infrastructure from exploitation. The primary mitigation strategy involves disabling CGI mapping rules within the WebSphere Edge Server when they are not essential for business operations, as this removes the attack vector entirely. Additionally, implementing comprehensive input validation and output sanitization measures at the proxy level can help prevent malicious data from being injected into error responses. Security administrators should also consider deploying web application firewalls or content filtering solutions that can detect and block suspicious script injection attempts. The implementation of proper HTTP headers such as Content Security Policy can provide additional protection against script execution in the browser context. Organizations should also conduct thorough security assessments to identify other potential injection points within their web infrastructure and ensure that all user-supplied data is properly validated and sanitized before processing. Regular updates and patches from IBM should be applied promptly to address this vulnerability, as the extended exposure period suggests that many organizations may have remained vulnerable for extended periods. The vulnerability also highlights the importance of proper security testing, particularly around error handling and input validation mechanisms within web application proxies and caching systems, aligning with the ATT&CK framework's emphasis on input validation and injection attack prevention techniques.