CVE-2008-1385 in Serendipity
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the Top Referrers (aka referrer) plugin in Serendipity (S9Y) before 1.3.1 allows remote attackers to inject arbitrary web script or HTML via the Referer HTTP header.
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Analysis
by VulDB Data Team • 09/28/2025
The vulnerability identified as CVE-2008-1385 represents a critical cross-site scripting flaw within the Serendipity (S9Y) blogging platform's Top Referrers plugin. This issue affects versions prior to 1.3.1 and demonstrates how web applications can become vectors for malicious code execution through improper input validation. The vulnerability specifically targets the Referer HTTP header processing within the referrer plugin, which is designed to track and display incoming link sources to the blog. When the system fails to properly sanitize this header input, it creates an opportunity for attackers to inject malicious scripts that can execute within the context of other users' browsers.
The technical exploitation of this vulnerability occurs through the manipulation of the HTTP Referer header, which browsers automatically include in requests to indicate the source page that linked to the current page. In the context of the Serendipity platform, the Top Referrers plugin processes this header information to display visitor referral data. When an attacker crafts a malicious Referer header containing script code, and this header is subsequently rendered by the plugin without proper sanitization, the injected code executes in the browser of any user viewing the affected page. This represents a classic server-side XSS vulnerability where the application fails to validate or escape user-controllable input before incorporating it into dynamically generated web content.
The operational impact of this vulnerability extends beyond simple script injection, potentially enabling attackers to perform session hijacking, deface the blog content, steal sensitive cookies, or redirect users to malicious websites. From a security perspective, this vulnerability aligns with CWE-79 which defines improper neutralization of input during web page generation as a primary weakness. The attack vector leverages the principle that HTTP headers are often treated as trusted data sources within web applications, despite being completely controllable by external parties. This flaw particularly affects the integrity of the user experience and can compromise the trust relationship between the blog owner and their visitors. The vulnerability demonstrates how seemingly innocuous components like referrer tracking can become security risks when proper input validation is omitted.
Organizations utilizing Serendipity platforms should implement immediate mitigations including updating to version 1.3.1 or later, which contains the necessary patches to address this vulnerability. Additional protective measures include implementing Content Security Policy headers to limit script execution, configuring web application firewalls to detect and block suspicious Referer header patterns, and conducting regular security audits of plugin components. From an ATT&CK framework perspective, this vulnerability maps to technique T1531 which involves establishing persistence through web shell creation, and T1059 which covers command and control through script injection. The remediation process should involve thorough input validation of all HTTP headers, particularly those used for tracking purposes, and implementation of proper output encoding for all dynamic content generation. Security teams should also consider monitoring for unusual patterns in referrer data that might indicate exploitation attempts, as this vulnerability represents a common attack vector in web application security assessments.