Same-Origin Policy Bypass in Lightpanda Headless Browser

Executive Summary

Lightpanda is a headless browser that had a flaw in its URL parser before version 0.3.1. The parser incorrectly searched for the '@' symbol across the entire URL instead of just the authority part. This caused URLs like http://attacker.com/@victim.com/ to be treated as originating from http://victim.com even though the page was fetched from attacker.com. This allowed a Same-Origin Policy bypass.

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Impact Analysis

An attacker could exploit this to make a malicious page appear as if it comes from a trusted domain. This could allow the attacker to access sensitive data, perform actions on behalf of the user, or bypass security restrictions on the victim's site.

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Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations using affected versions may face compliance breaches and legal consequences.

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Detection Guidance

To detect this vulnerability, check if your Lightpanda browser version is below 0.3.1. Run: lightpanda --version. If the version is older, the system is vulnerable. Inspect network traffic for URLs with @ symbols in unexpected locations, such as http://attacker.com/@victim.com/, which may indicate exploitation attempts.

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Mitigation Strategies

Upgrade Lightpanda browser to version 0.3.1 or later immediately. This fixes the URL parsing flaw. If upgrading is not possible, restrict access to untrusted URLs or disable Lightpanda until patched. Monitor for unusual cross-origin requests or Same-Origin Policy violations.

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