CVE-2001-1523 in DMOZGateway
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the DMOZGateway module for PHP-Nuke allows remote attackers to inject arbitrary web script or HTML via the topic parameter.
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Analysis
by VulDB Data Team • 04/10/2019
The CVE-2001-1523 vulnerability represents a classic cross-site scripting flaw within the DMOZGateway module of PHP-Nuke content management system. This vulnerability specifically targets the topic parameter handling mechanism, creating an exploitable condition where malicious actors can inject arbitrary web scripts or HTML code into the application's response. The DMOZGateway module serves as an interface for accessing the Open Directory Project database, which was a prominent web directory service at the time. When PHP-Nuke processes user input through the topic parameter without proper sanitization or output encoding, it inadvertently executes malicious code within the context of other users' browsers. The vulnerability stems from inadequate input validation and output encoding practices that were prevalent in web applications during the early 2000s era.
The technical exploitation of this vulnerability follows standard XSS attack patterns where attackers craft malicious URLs containing script payloads in the topic parameter. When legitimate users navigate to these crafted URLs or view pages containing the malicious input, the injected scripts execute in their browser context with the privileges of the victim user. This creates a persistent threat vector that can be used for session hijacking, credential theft, or redirection to malicious sites. The vulnerability maps directly to CWE-79, which defines Cross-Site Scripting as a weakness where applications fail to properly validate or encode user-supplied data before including it in dynamically generated web pages. The attack surface is particularly concerning in the context of PHP-Nuke's user base, as many organizations relied on this CMS for their web presence and the DMOZGateway module was commonly used for directory functionality.
From an operational impact perspective, this vulnerability poses significant risks to web application security and user privacy. The attack can be executed remotely without requiring authentication, making it particularly dangerous for widely accessible web applications. Successful exploitation allows attackers to perform actions on behalf of users, potentially compromising sensitive information or modifying application behavior. The vulnerability's impact extends beyond immediate data theft to include long-term security degradation through persistent malicious scripts that can remain active until the application is updated or the malicious content is removed. Organizations using PHP-Nuke systems were particularly vulnerable as the DMOZGateway module was often enabled by default, creating an implicit attack vector for any site that did not properly secure their input handling mechanisms. The threat landscape was further complicated by the fact that many organizations lacked comprehensive security testing procedures, making such vulnerabilities more prevalent in production environments.
Mitigation strategies for CVE-2001-1523 require immediate implementation of input validation and output encoding measures. The primary defense involves sanitizing all user-supplied input through proper validation routines that reject or escape potentially dangerous characters before processing. This approach aligns with ATT&CK technique T1566, which focuses on credential access through phishing and social engineering, as XSS attacks often serve as initial access vectors for more sophisticated attacks. Organizations should implement proper output encoding mechanisms that ensure user-supplied data cannot be interpreted as executable code when rendered in web browsers. The recommended solution includes updating the DMOZGateway module to properly sanitize the topic parameter through functions like htmlspecialchars or similar encoding routines. Additionally, implementing a content security policy (CSP) header can provide an additional layer of protection against XSS attacks by restricting script execution sources. Regular security audits and input validation testing should be integrated into the development lifecycle to prevent similar vulnerabilities from being introduced in future versions of web applications. The vulnerability also highlights the importance of keeping CMS platforms updated, as newer versions typically include enhanced security measures and proper input validation that would prevent such exploitation scenarios.