CVE-2002-0731 in vqServer
Summary
by MITRE
Cross-site scripting vulnerability in demonstration scripts for vqServer allows remote attackers to execute arbitrary script via a link that contains the script in arguments to demo scripts such as respond.pl.
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Analysis
by VulDB Data Team • 09/14/2025
The vulnerability identified as CVE-2002-0731 represents a classic cross-site scripting flaw within demonstration scripts of the vqServer platform. This security weakness specifically affects the respond.pl script and similar demonstration components that process user input through URL arguments. The vulnerability stems from inadequate input validation and output encoding mechanisms within these server-side demonstration scripts, creating an environment where malicious actors can inject executable code into web responses. The flaw operates at the application layer and demonstrates a fundamental failure in proper sanitization of user-supplied data before it is rendered in web browser contexts.
The technical implementation of this vulnerability involves the manipulation of URL parameters that are passed to the demonstration scripts. When users click on maliciously crafted links containing script code within the URL arguments, the vqServer demonstration scripts fail to properly sanitize or encode these inputs before including them in the HTTP response. This allows attackers to inject HTML, JavaScript, or other executable code that gets executed within the victim's browser context when they visit the compromised page. The vulnerability is particularly dangerous because it leverages legitimate demonstration functionality to deliver malicious payloads, making it more difficult to detect and prevent through standard security measures.
The operational impact of this cross-site scripting vulnerability extends beyond simple data theft or session hijacking. Attackers can leverage this weakness to perform a wide range of malicious activities including but not limited to cookie theft, session fixation attacks, redirection to malicious sites, and the execution of arbitrary commands within the victim's browser environment. The demonstration nature of the affected scripts means that these vulnerabilities are often accessible to anyone who can obtain or guess the URL patterns, potentially affecting a wide range of users who encounter these links in various contexts. The vulnerability also demonstrates poor security practices in the development and deployment of demonstration software, where security considerations are often neglected in favor of functionality and ease of use.
Organizations and developers should address this vulnerability through multiple mitigation strategies including immediate input validation and output encoding implementations for all user-supplied data. The fix should involve proper sanitization of URL parameters before they are processed or displayed in web responses, implementing Content Security Policy headers to limit script execution, and conducting thorough security reviews of all demonstration and sample code. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and maps to ATT&CK technique T1566 related to spearphishing with malicious attachments or links. The remediation process should include comprehensive code reviews, security testing of all input handling mechanisms, and implementation of proper web application firewalls to detect and block malicious payloads. Additionally, organizations should establish secure coding practices and regular security training to prevent similar issues in future development cycles.