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CVE-2016-2141

9.8 CRITICAL
Authentication Bypass

📋 TL;DR

CVE-2016-2141 is a critical security flaw in JGroups where new nodes joining a cluster aren't required to provide proper encryption and authentication headers. This allows attackers to bypass security controls, join clusters without authorization, and potentially intercept, spoof, or manipulate cluster communications. Organizations using JGroups for distributed systems or messaging are affected.

💻 Affected Systems

Products:
  • JGroups
  • Red Hat JBoss Enterprise Application Platform
  • Red Hat JBoss Web Server
  • Red Hat JBoss Fuse Service Works
  • Red Hat JBoss BRMS
  • Red Hat JBoss BPMS
Versions: JGroups versions prior to 3.6.6
Operating Systems: All platforms running affected JGroups versions
Default Config Vulnerable: ⚠️ Yes
Notes: Affects clusters using ENCRYPT and/or AUTH protocols. Default configurations with these protocols enabled are vulnerable.

📦 What is this software?

Jboss Enterprise Application Platform by Redhat

View all CVEs affecting Jboss Enterprise Application Platform →

Jboss Enterprise Application Platform by Redhat

View all CVEs affecting Jboss Enterprise Application Platform →

Jboss Enterprise Application Platform by Redhat

View all CVEs affecting Jboss Enterprise Application Platform →

Jgroups by Redhat

View all CVEs affecting Jgroups →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete cluster compromise allowing unauthorized access to all cluster communications, data exfiltration, message injection, and potential lateral movement to other systems.

🟠

Likely Case

Unauthorized access to sensitive cluster communications leading to information disclosure and potential message manipulation within affected clusters.

🟢

If Mitigated

Limited impact with proper network segmentation and monitoring, though risk remains if vulnerable versions are exposed.

🌐 Internet-Facing: HIGH - If JGroups clusters are exposed to untrusted networks, attackers can directly exploit this vulnerability.
🏢 Internal Only: MEDIUM - Internal attackers or compromised systems could exploit this to gain unauthorized cluster access.

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

Exploitation requires network access to the JGroups cluster but no authentication. Attackers can join clusters by mimicking legitimate nodes.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: JGroups 3.6.6 or later

Vendor Advisory: http://rhn.redhat.com/errata/RHSA-2016-1435.html

Restart Required: Yes

Instructions:

1. Identify affected JGroups installations. 2. Update to JGroups 3.6.6 or later. 3. For Red Hat products, apply relevant security patches via yum update. 4. Restart all cluster nodes and applications using JGroups.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate JGroups clusters from untrusted networks using firewalls or network ACLs

Disable Cluster Joins

all

Temporarily restrict new nodes from joining clusters if not required

🧯 If You Can't Patch

  • Implement strict network controls to limit access to JGroups ports (typically 7800-7801, 7600)
  • Monitor cluster membership changes and audit all new node join attempts

🔍 How to Verify

Check if Vulnerable:

Check JGroups version: grep -i 'jgroups' in application libraries or check Maven/Gradle dependencies for versions <3.6.6

Check Version:

java -cp jgroups.jar org.jgroups.Version

Verify Fix Applied:

Verify JGroups version is 3.6.6 or later and test that new nodes require proper encryption/auth headers to join

📡 Detection & Monitoring

Log Indicators:

  • Unexpected node join events
  • Failed authentication attempts from unknown nodes
  • Cluster membership changes without authorization

Network Indicators:

  • Unauthorized connections to JGroups ports (7800-7801, 7600)
  • Suspicious cluster join requests from unknown IPs

SIEM Query:

source="jgroups.log" AND ("JOIN" OR "new member") AND NOT src_ip IN [authorized_ips]

📊 Metadata

CVE ID: CVE-2016-2141
CVSS v3 Score: 9.8 (CRITICAL)
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: June 30, 2016
Last Updated: April 12, 2025

🔗 References

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