Unauthenticated Open Redirect in Web-UI

Executive Summary

This vulnerability allows an unauthenticated remote attacker to manipulate the post-login redirect feature in the web interface. By tricking users into following a malicious link, the attacker can redirect them to a harmful website, potentially compromising their data or system access.

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Detection Guidance

This vulnerability involves improper validation of post-login redirect in a web UI, which could allow attackers to redirect users to malicious sites. To detect it, inspect web application logs for unusual redirect patterns or unexpected URLs after login. Check for HTTP 302/301 responses with suspicious Location headers. Use tools like curl to test redirect behavior: curl -v http://target/login?redirect=http://malicious-site.com. Monitor network traffic for unauthorized external connections post-authentication.

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Impact Analysis

This vulnerability can lead to loss of confidentiality and availability. Attackers may steal sensitive information or disrupt access to critical services by redirecting users to malicious sites.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling attackers to redirect users to malicious websites, leading to unauthorized data exposure or loss of availability. Such incidents may violate data protection requirements under these regulations.

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Mitigation Strategies

Implement strict input validation for the post-login redirect parameter to ensure it only allows trusted URLs. Configure the web application to reject or sanitize any redirect URLs that point to external domains. Regularly update and patch the web application to address known vulnerabilities.

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