RabbitMQ CVE-2020-14148 Auth Bypass Patch Analysis

Vulnerability Overview This page displays the fix patch (Commit ) for a privilege bypass vulnerability (CVE-2020-14148) in RabbitMQ. Core Issue: In RabbitMQ versions 3.8.0 to 3.8.5, when a user has permission on a specific Exchange, if that Exchange is configured with an , an attacker can send messages to that Exchange. By leveraging the routing mechanism of the alternate exchange, the attacker can forward messages to other Exchanges to which they originally did not have permission. Impact Scope Affected Component: RabbitMQ Server Affected Versions: 3.8.0 to 3.8.5 Trigger Conditions: 1. The user has permission on Exchange A. 2. Exchange A is configured with an pointing to Exchange B. 3. The user does not have permission on Exchange B. 4. The user sends a message to Exchange A that cannot be routed, triggering the alternate exchange mechanism. Remediation The patch modifies the Erlang code to add permission checks within the message routing logic. Key Code Changes ( ): In the function, when a message cannot be routed to the current Exchange and needs to be forwarded to the , a permission check for the target Exchange's access is added. Specific Code Snippet (from screenshot): Test Code ( ):** The patch includes test cases to verify the effectiveness of the fix: Summary This vulnerability arose because RabbitMQ failed to check the user's write permission on the target Exchange when handling alternate exchange routing. The remediation adds a permission check in the routing logic, ensuring that a user can only forward messages via the alternate exchange if they possess permission on the target Exchange.

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RabbitMQ CVE-2020-14148 Auth Bypass Patch Analysis

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