RabbitMQ Access Control Flaws: Defending Against OAuth Secret Leaks and Tenant Bypass

Critical infrastructure defenders need to be on high alert following the disclosure of severe access control vulnerabilities in RabbitMQ, one of the most widely deployed open-source message brokers. Research published by the Miggo security team has revealed flaws that fundamentally break isolation boundaries in multi-tenant environments and leak sensitive OAuth client secrets.

For organizations relying on RabbitMQ for enterprise messaging, these are not theoretical edge cases. An attacker exploiting these flaws could leak the broker's confidential OAuth client secrets, effectively paving the way for a complete takeover of the messaging infrastructure. In multi-tenant SaaS environments or internal microservice architectures, the risk of cross-tenant queue metadata exposure bypasses critical security boundaries, potentially allowing one tenant to map the infrastructure of another. We need to treat this as an active threat to supply chain integrity and data confidentiality.

Technical Analysis

While specific CVE identifiers were not detailed in the initial disclosure, the technical impact centers on two primary vectors:

1. OAuth Secret Leakage: The vulnerability allows an attacker to leak the broker's confidential OAuth client secrets. In environments where RabbitMQ is integrated with an Identity Provider (IdP) using OAuth2, these secrets are the crown keys. Once exposed, an attacker can authenticate as the application itself, bypassing standard authentication flows and potentially gaining administrative control over the broker depending on the scope of the OAuth token.

2. Cross-Tenant Metadata Exposure: The second flaw bypasses tenant boundaries, exposing queue metadata across different tenants. While this may not immediately leak the payload of the messages, metadata is often just as valuable. It reveals queue names, routing keys, and message volume, allowing an attacker to map the internal topology of the target infrastructure, identify high-value targets, and prepare for more targeted attacks (e.g., data exfiltration or ransomware).

Affected Components:

• RabbitMQ Management Plugin: The HTTP API used for management and monitoring is the primary attack surface for these vulnerabilities.
• OAuth2 Backend: Configurations relying on OAuth2 for authentication are specifically vulnerable to the secret leakage aspect.

Exploitation Requirements: Exploitation likely requires network access to the RabbitMQ Management Interface (typically ports 15672 or 15671) and valid, albeit low-privilege, credentials in some scenarios, or anonymous access if misconfigured. Given the nature of access control flaws, we must assume that unauthenticated or authenticated-but-authorized users can trigger the leak.

Detection & Response

Detecting these vulnerabilities requires a shift in how we monitor RabbitMQ management traffic. We cannot rely solely on standard error logs, as these flaws may return successful HTTP 200 OK responses while exposing unauthorized data.

The following rules and queries focus on identifying anomalous access to the RabbitMQ Management API, specifically targeting endpoints related to OAuth parameters and queue metadata enumeration that cross typical isolation boundaries.

SIGMA Rules

---
title: RabbitMQ Management API OAuth Parameter Access
id: 88a3b1c2-d4e5-6f78-90a1-b2c3d4e5f678
status: experimental
description: Detects attempts to access OAuth configuration parameters via the RabbitMQ Management API, which may indicate attempts to leak client secrets or bypass authentication.
references:
 - https://www.rabbitmq.com/management.html
author: Security Arsenal
date: 2026/07/15
tags:
 - attack.credential_access
 - attack.t1552
logsource:
 category: web_access
 product: proxy
detection:
 selection:
 c_uri|contains:
   - '/api/parameters/oauth'
   - '/api/oauth2'
   - '/api/auth/oauth'
 condition: selection
falsepositives:
 - Legitimate administrative configuration changes via the UI
level: high
---
title: RabbitMQ Cross-Tenant Queue Enumeration
id: 99c4d2e3-e5f6-0a78-91b2-c3d4e5f6a789
status: experimental
description: Detects potential cross-tenant reconnaissance by monitoring for enumeration of queue metadata across different vhosts or rapid scanning of the /api/queues endpoint.
references:
 - https://www.rabbitmq.com/access-control.html
author: Security Arsenal
date: 2026/07/15
tags:
 - attack.discovery
 - attack.t1018
logsource:
 category: web_access
 product: proxy
detection:
 selection:\  c_uri|contains: '/api/queues'
 selection_filter:
 cs_method|contains: 'GET'
 rate:
 timeframe: 1m
 value: 10
 condition: selection and selection_filter | rate()
falsepositives:
 - Authorized monitoring tools or health checks performing frequent polling
level: medium

KQL (Microsoft Sentinel / Defender)

This query hunts for successful access to sensitive API endpoints on the RabbitMQ management interface from IP addresses that have not historically accessed the admin panel or are accessing endpoints related to OAuth configuration.

// Hunt for RabbitMQ Management API Access to Sensitive OAuth/Metadata Endpoints
let RabbitMQPorts = dynamic([15672, 15671, 443, 80]); // Adjust if running behind reverse proxy
let AdminEndpoints = dynamic(["/api/oauth", "/api/parameters", "/api/queues"]);
DeviceNetworkEvents
| where RemotePort in (RabbitMQPorts)
| where InitiatingProcessFileName !in ("rabbitmq.bat", "erl.exe", "beam.smp", "curl", "wget") // Exclude local broker processes
| extend URL = tostring(parse_url(RemoteUrl).Path)
| where URL has_any (AdminEndpoints)
| summarize count(), FirstSeen=min(Timestamp), LastSeen=max(Timestamp) by DeviceName, InitiatingProcessAccountName, RemoteIP, URL
| order by count_ desc

Velociraptor VQL

This artifact hunts for unexpected processes interacting with the RabbitMQ configuration files or establishing network connections to the management port.

-- Hunt for suspicious processes connecting to RabbitMQ Management Port
SELECT Pid, Name, CommandLine, Exe, Username, RemoteAddress, RemotePort
FROM listen() 
LEFT JOIN foreach(
    SELECT * FROM netstat() WHERE RemotePort = 15672 OR RemotePort = 15671
) AS NetInfo ON Pid = NetInfo.Pid
WHERE NetInfo.RemotePort > 0
  AND Name NOT IN ("beam.smp", "epmd", "rabbitmq-server")
GROUP BY Pid, Name

Remediation Script (Bash)

Use this script to verify the exposure of the RabbitMQ Management interface and check for the presence of OAuth configurations. Note: A full patch requires applying the latest updates from the vendor.

#!/bin/bash

# RabbitMQ Security Hardening Check
# Author: Security Arsenal
# Date: 2026-07-15

echo "[*] Checking RabbitMQ Management Interface Exposure..."

# Check if management plugin is enabled
if rabbitmq-plugins list -e -m | grep -q "rabbitmq_management"; then
    echo "[!] WARNING: RabbitMQ Management Plugin is ENABLED."
    
    # Check listening status (Assumes standard port, adjust as needed)
    if netstat -tuln | grep -q ":15672 "; then
        echo "[!] CRITICAL: Management interface is listening on port 15672 (default)."
        echo "[!] Recommendation: Restrict access via firewall or bind to localhost."
    fi
else
    echo "[+] Management plugin is disabled."
fi

echo "[*] Checking for OAuth configurations..."
# Check rabbitmq.config or advanced.config for oauth settings
if [ -f /etc/rabbitmq/rabbitmq.conf ]; then
    if grep -q "auth_oauth2" /etc/rabbitmq/rabbitmq.conf; then
        echo "[!] NOTICE: OAuth2 is configured. Please rotate client secrets immediately."
    fi
fi

echo "[*] Action Item: Apply the latest security patches released for RabbitMQ immediately."
echo "[*] Action Item: Restrict Management API access to known IP subnets via iptables or security groups."

Remediation

1. Patch Immediately: Check the official RabbitMQ release notes and vendor advisory provided by the researchers at Miggo. Apply the latest security patches addressing these access control flaws. There is no viable substitute for patching an access control vulnerability of this nature.

2. Network Segmentation:

   • Restrict access to the RabbitMQ Management API (ports 15672/15671) via firewall rules. Only allow access from trusted administration subnets or bastion hosts. Do not expose the management interface to the public internet.
   • Ensure that inter-service communication does not rely on the management API for sensitive operations if possible.

3. Secret Rotation:

   • If you are using OAuth2 with RabbitMQ, rotate your OAuth client secrets immediately. Assume that if the interface was accessible, the secrets may have been leaked.
   • Audit logs for any unauthorized access patterns dating back to the disclosure date.

4. Tenant Isolation Verification:

   • Review your vhost and user permission configurations. Ensure that users are strictly limited to specific virtual hosts and do not have read permissions on global cluster-wide metadata unless absolutely necessary.

5. Audit and Monitor: Deploy the detection rules provided above. Set up alerts for any successful access to OAuth parameter endpoints or anomalous enumeration of queue metadata.

Related Resources

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