Open Redirect in Serendipity Blog Platform

Executive Summary

Serendipity versions before 2.6.1 have an open redirect vulnerability in exit.php. When the Track Exits plugin is configured with commentredirection set to s9y, unauthenticated attackers can supply a malicious Base64-encoded url parameter to redirect users to arbitrary external sites. This allows attackers to craft trusted-looking URLs using the legitimate blog domain for phishing, malware delivery, or bypassing URL reputation filters.

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Detection Guidance

Check Serendipity version for versions before 2.6.1. Inspect exit.php for improper handling of the url parameter in the Track Exits plugin. Monitor HTTP requests to exit.php with Base64-encoded url parameters redirecting to external domains.

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Impact Analysis

This vulnerability can lead to phishing attacks where users are tricked into visiting malicious sites. It may also enable malware distribution through seemingly trustworthy links. Additionally, it can bypass URL reputation filters, allowing attackers to evade security measures.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling phishing attacks or unauthorized data access through open redirects. Attackers may use the flaw to trick users into visiting malicious sites, risking data breaches or unauthorized disclosures. However, the CVE does not provide specific compliance implications.

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Mitigation Strategies

Upgrade Serendipity to version 2.6.1 or later. Disable the Track Exits plugin if not needed. If required, configure the plugin to restrict redirection to trusted domains only.

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