CVE-2021-32718

Description

RabbitMQ is a multi-protocol messaging broker. In rabbitmq-server prior to version 3.8.17, a new user being added via management UI could lead to the user's bane being rendered in a confirmation message without proper `<script>` tag sanitization, potentially allowing for JavaScript code execution in the context of the page. In order for this to occur, the user must be signed in and have elevated permissions (other user management). The vulnerability is patched in RabbitMQ 3.8.17. As a workaround, disable `rabbitmq_management` plugin and use CLI tools for management operations and Prometheus and Grafana for metrics and monitoring.

CVSS Metrics

• v3.1•LOW•Score: 3.1CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N
• v3.1•MEDIUM•Score: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
• v2.0•LOW•Score: 3.5AV:N/AC:M/Au:S/C:N/I:P/A:N

EPSS Trends

Current EPSS score: 0.12%• Percentile: 30%

Techniques & Countermeasures

• CWE-79•Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

  The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

• CWE-80•Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

  The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.

Affected Systems

• rabbitmq•rabbitmq-server

  < 3.8.17

• vmware•rabbitmq

  < 3.8.17

References (3)

• https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-c3hj-rg5h-2772
• https://github.com/rabbitmq/rabbitmq-server/pull/3028
• http://seclists.org/fulldisclosure/2021/Dec/3