GHSA-rjcf-35r5-xw38

Описание

Origin

This vulnerability was identified by Team RabbitMQ and/or other teams at Broadcom, not via a responsible disclosure from an external researcher.

Source references

deps/rabbitmq_management/priv/www/js/tmpl/connection.ejs:135 · Stored XSS

Impact

An attacker who can obtain a TLS client certificate signed by a CA the broker trusts (with verify_peer enabled) can embed JavaScript in the certificate's Subject DN. When any administrator views that connection in the management UI, the script executes in the admin's browser session, allowing full account takeover (create users, export definitions, etc.). The management UI's CSP includes 'unsafe-inline', so inline script execution is not blocked.

Description

The management UI uses EJS 1.0 in which <%= ... %> does NOT HTML-escape. connection.ejs:135 renders <%= connection.ssl_details.peer_cert_subject %> (and peer_cert_issuer) directly into the page. The same pattern appears in streamConnection.ejs:102,106,110. The values come from rabbit_ssl:peer_cert_subject/1 which formats the DN as a string without HTML escaping. The verifier corrected the original researcher's claim: this is reachable only when the listener is configured with verify_peer (so the certificate must be signed by a CA in the broker's trust store, not arbitrary self-signed); however, in deployments using mTLS for client authentication, any user who can request a certificate from the organisational CA controls the Subject CN.

Exploit scenario

Attacker requests a client certificate from the corporate CA with CN=<img src=x onerror=fetch('/api/users/backdoor',{method:'PUT',headers:{'content-type':'application/json'},body:'{"password":"x","tags":"administrator"}'})>. Attacker connects to the AMQPS port with this certificate. An administrator opens the management UI and clicks the connection. The payload executes, creating a backdoor admin user.

Preconditions

• TLS listener configured with ssl_options.verify = verify_peer
• Attacker can obtain a CA-signed client certificate with attacker-chosen Subject (e.g. self-service corporate PKI, or rabbitmq_trust_store plugin in use)
• Administrator views the connection detail page

CVSS

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N (7.3, High). Fixed in 3.13.15, 4.0.20, 4.1.11, 4.2.6, 4.3.0.