Stored Open Redirect in Zipline Prior to 4.5.0

Executive Summary

Zipline before 4.5.0 has a stored open redirect flaw. Authenticated users can set arbitrary short URL destinations by exploiting missing scheme validation in the POST /api/user/urls endpoint. Attackers can store malicious URLs like javascript: URIs, which redirect visitors of trusted short links to phishing or malware pages.

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Detection Guidance

To detect this vulnerability, inspect Zipline instances for short URLs with suspicious destinations like javascript: URIs or external domains. Check POST /api/user/urls requests for missing URL scheme validation. Review stored short URLs for unauthorized modifications by authenticated users.

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Impact Analysis

If you use Zipline before 4.5.0, attackers could trick you into clicking a trusted short link that redirects to a phishing or malware site. This could lead to credential theft, malware infections, or other security breaches.

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Mitigation Strategies

Upgrade Zipline to version 4.5.0 or later to address the missing scheme validation. Implement strict URL scheme validation for all short URL destinations. Monitor and audit short URLs for unauthorized changes. Restrict user permissions to prevent arbitrary URL modifications.

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