CVE-2021-39231 – Apache Ozone versions before 1.2.0 expose inter... (How to Fix)

Q: What is the severity of CVE-2021-39231?

CVE-2021-39231 has a CVSS score of 9.1 (CRITICAL). Apache Ozone versions before 1.2.0 expose internal RPC endpoints that allow attackers to download raw data from Datanode and Ozone Manager components, and modify Ratis replication configuration. This affects all Apache Ozone deployments using vulnerable versions. Attackers can potentially access sensitive data and disrupt cluster operations.

📋 TL;DR

Apache Ozone versions before 1.2.0 expose internal RPC endpoints that allow attackers to download raw data from Datanode and Ozone Manager components, and modify Ratis replication configuration. This affects all Apache Ozone deployments using vulnerable versions. Attackers can potentially access sensitive data and disrupt cluster operations.

💻 Affected Systems

Products:

Apache Ozone

Versions: All versions prior to 1.2.0

Operating Systems: All platforms running Apache Ozone

Default Config Vulnerable: ⚠️ Yes

Notes: Affects all default configurations of Apache Ozone. The vulnerability is in the internal RPC communication between Ozone components.

📦 What is this software?

Ozone by Apache

View all CVEs affecting Ozone →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete data exfiltration from Datanode storage, unauthorized modification of replication settings causing data loss or corruption, and potential privilege escalation within the cluster.

🟠

Likely Case

Unauthorized access to sensitive data stored in Ozone, disruption of replication services, and potential data integrity issues.

🟢

If Mitigated

Limited impact with proper network segmentation and access controls, but still vulnerable to internal threats.

🌐 Internet-Facing: HIGH if RPC endpoints are exposed to untrusted networks, as exploitation requires no authentication.

🏢 Internal Only: HIGH due to the server-to-server nature of the vulnerable endpoints, making internal attackers particularly dangerous.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires network access to the vulnerable RPC endpoints but no authentication. The technical details are publicly documented in security advisories.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.2.0

Vendor Advisory: https://mail-archives.apache.org/mod_mbox/ozone-dev/202111.mbox/%3C110cd117-75ed-364b-cd38-3effd20f2183%40apache.org%3E

Restart Required: Yes

Instructions:

1. Download Apache Ozone 1.2.0 or later from the official Apache website. 2. Stop all Ozone services. 3. Backup configuration and data. 4. Install the new version. 5. Restart all Ozone services. 6. Verify cluster functionality.

🔧 Temporary Workarounds

Network Segmentation

linux

Restrict network access to Ozone RPC endpoints using firewall rules to only allow trusted internal hosts.

iptables -A INPUT -p tcp --dport [OZONE_RPC_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [OZONE_RPC_PORT] -j DROP

🧯 If You Can't Patch

Implement strict network segmentation to isolate Ozone components from untrusted networks.
Monitor network traffic to Ozone RPC endpoints for unauthorized access attempts.

🔍 How to Verify

Check if Vulnerable:

Check the Apache Ozone version. If version is less than 1.2.0, the system is vulnerable.

Check Version:

ozone version

Verify Fix Applied:

Verify the installed Apache Ozone version is 1.2.0 or higher and test that RPC endpoints are no longer accessible from unauthorized networks.

📡 Detection & Monitoring

Log Indicators:

Unauthorized connection attempts to Ozone RPC ports in system logs
Unexpected data access patterns in Ozone audit logs

Network Indicators:

Unusual traffic to Ozone RPC ports from unauthorized IP addresses
Data exfiltration patterns from Datanode components

SIEM Query:

source="ozone.log" AND ("RPC connection" OR "unauthorized access")

📊 Metadata

CVE ID: CVE-2021-39231

CVSS v3 Score: 9.1 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE: CWE-862

Published: November 19, 2021

Last Updated: November 21, 2024

🔗 References

http://www.openwall.com/lists/oss-security/2021/11/19/2 Mailing List,Third Party Advisory
https://mail-archives.apache.org/mod_mbox/ozone-dev/202111.mbox/%3C110cd117-75ed-364b-cd38-3effd20f2183%40apache.org%3E Mailing List,Mitigation,Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/11/19/2 Mailing List,Third Party Advisory
https://mail-archives.apache.org/mod_mbox/ozone-dev/202111.mbox/%3C110cd117-75ed-364b-cd38-3effd20f2183%40apache.org%3E Mailing List,Mitigation,Vendor Advisory

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