CVE-2009-4866 in Simple Search
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in search.cgi in Matt s Script Archive (MSA) Simple Search 1.0 allows remote attackers to inject arbitrary web script or HTML via the terms parameter. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 12/31/2017
The vulnerability identified as CVE-2009-4866 represents a critical cross-site scripting flaw within the Matt s Script Archive (MSA) Simple Search version 1.0 web application. This weakness resides in the search.cgi script which fails to properly sanitize user input before incorporating it into web responses. The vulnerability specifically affects the terms parameter, which serves as the primary input field for search queries within the application's interface. Attackers can exploit this flaw by submitting malicious payloads through the search functionality, potentially executing arbitrary JavaScript code within the context of other users' browsers who view the affected search results.
The technical nature of this vulnerability aligns with CWE-79, which defines cross-site scripting as a code injection attack where malicious scripts are injected into otherwise benign and trusted websites. This particular implementation flaw demonstrates a classic failure in input validation and output encoding practices that are fundamental to preventing XSS attacks. The vulnerability operates by bypassing the application's security controls that should normally prevent user-supplied data from being executed as code within the browser environment. When the search.cgi script processes the terms parameter without adequate sanitization, it directly incorporates the user input into the HTTP response, creating an environment where attacker-controlled scripts can execute in the victim's browser context.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it can enable sophisticated attack chains that leverage the victim's authenticated session. An attacker could craft malicious search terms that, when executed, steal session cookies, redirect users to phishing sites, or perform actions on behalf of authenticated users. This vulnerability particularly affects web applications that rely on user-generated content processing, as it demonstrates how simple input parameters can become entry points for complex attack vectors. The risk is amplified when the vulnerable application serves a large user base or handles sensitive information, as the potential for widespread exploitation increases significantly.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms. The most effective immediate fix involves sanitizing all user input through proper encoding before incorporating it into web responses, particularly for HTML, JavaScript, and URL contexts. Organizations should implement Content Security Policy headers to limit script execution capabilities and employ proper input validation that rejects or removes potentially dangerous characters and patterns. Additionally, the application should be updated to a patched version of MSA Simple Search or replaced with a more secure alternative. Security monitoring should include detection of suspicious search queries and regular vulnerability assessments to identify similar weaknesses in other application components. This vulnerability underscores the critical importance of following secure coding practices and adheres to ATT&CK technique T1068 which covers local privilege escalation through web application vulnerabilities. The remediation process should also include comprehensive security training for developers to prevent similar issues in future code development cycles, as this type of vulnerability often stems from inadequate security awareness during the software development lifecycle.