Open Redirect Vulnerability in Dianping CAT Login/Logout Component

Executive Summary

This vulnerability is an open redirect flaw in Dianping CAT versions 3.0.0, 3.1.0, and 4.0-RC1. It exists in the Handler.redirect function of the Login/Logout component, specifically in Handler.java. An attacker can manipulate the rtnUrl argument to redirect users to arbitrary websites.

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Detection Guidance

This vulnerability involves an open redirect in Dianping CAT's Login/Logout component due to manipulation of the rtnUrl argument. To detect it, inspect network traffic for suspicious redirect URLs containing the rtnUrl parameter with external domains. Check server logs for unusual redirect patterns or requests to Handler.redirect with modified rtnUrl values.

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Impact Analysis

This vulnerability allows attackers to trick users into visiting malicious websites by redirecting them from a trusted source. It can lead to phishing attacks, credential theft, or malware downloads. The exploit is publicly available and can be used remotely.

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Compliance Impact

This vulnerability involves an open redirect flaw in Dianping CAT's login/logout component, which could allow attackers to manipulate URLs. While this does not directly impact GDPR or HIPAA compliance, open redirects may contribute to phishing attacks that could lead to unauthorized data access, potentially violating these regulations if user data is compromised.

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Mitigation Strategies

Immediately update or patch the Dianping CAT component to a version that fixes the open redirect flaw in Handler.redirect. If no patch is available, disable or restrict access to the Login/Logout component until a fix is applied. Monitor network traffic for unusual redirects or suspicious URLs containing rtnUrl parameters.

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