CVE-2021-2322
📋 TL;DR
CVE-2021-2322 is a critical vulnerability in OpenGrok web application that allows authenticated attackers with low privileges to completely compromise the system via HTTPS. This affects OpenGrok versions 1.6.7 and earlier. Successful exploitation results in full system takeover with confidentiality, integrity, and availability impacts.
💻 Affected Systems
- OpenGrok
📦 What is this software?
Opengrok by Oracle
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the OpenGrok server allowing attacker to execute arbitrary code, access sensitive source code repositories, modify data, and potentially pivot to other systems.
Likely Case
Attacker gains full control over OpenGrok instance, potentially accessing proprietary source code, modifying search results, and disrupting code search functionality.
If Mitigated
Limited impact if proper network segmentation, least privilege access, and monitoring are in place to detect and contain exploitation attempts.
🎯 Exploit Status
Requires low privileged authenticated access but is described as 'easily exploitable' in the advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.6.8 or later
Vendor Advisory: https://www.oracle.com/security-alerts/oracle-open-source-cves-outside-other-oracle-public-documents.html
Restart Required: Yes
Instructions:
1. Download OpenGrok version 1.6.8 or later from official repository. 2. Stop the OpenGrok service. 3. Replace the vulnerable version with patched version. 4. Restart the OpenGrok service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to OpenGrok to only trusted IP addresses or internal networks
# Use firewall rules to restrict access
iptables -A INPUT -p tcp --dport 8080 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP
Authentication Hardening
allImplement additional authentication layers and reduce user privileges
# Configure web server authentication
# Use reverse proxy with additional auth
# Implement IP-based access controls
🧯 If You Can't Patch
- Isolate OpenGrok instance in a segmented network with strict access controls
- Implement application-level monitoring and alerting for suspicious activities
🔍 How to Verify
Check if Vulnerable:
Check OpenGrok version by accessing the web interface and viewing version information or checking deployment filesCheck Version:
grep -i version /path/to/opengrok/WEB-INF/web.xml || check web interface footerVerify Fix Applied:
Verify OpenGrok version is 1.6.8 or later and test functionality remains intact📡 Detection & Monitoring
Log Indicators:
- Unusual authentication patterns
- Unexpected process execution
- File modifications in OpenGrok directories
- Suspicious HTTP requests to OpenGrok endpoints
Network Indicators:
- Unusual outbound connections from OpenGrok server
- HTTPS traffic patterns indicating exploitation attempts
SIEM Query:
source="opengrok" AND (event="authentication_failure" OR event="file_modification" OR event="process_execution")