CVE-2021-27779
📋 TL;DR
CVE-2021-27779 is a critical information disclosure vulnerability in HCL VersionVault Express that exposes sensitive information. Attackers can exploit this to impersonate servers or eavesdrop on communications, potentially compromising the entire VersionVault environment. All organizations using affected versions of VersionVault Express are vulnerable.
💻 Affected Systems
- HCL VersionVault Express
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of VersionVault environment, unauthorized access to source code repositories, data theft, and potential lateral movement to connected systems.
Likely Case
Unauthorized access to sensitive configuration data, credential harvesting, and man-in-the-middle attacks against VersionVault communications.
If Mitigated
Limited exposure if network segmentation and access controls prevent external access, but internal threats remain.
🎯 Exploit Status
The vulnerability allows unauthenticated attackers to access sensitive information without complex exploitation techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 9.1.2.0 and 10.0.0.0
Vendor Advisory: https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0098165
Restart Required: Yes
Instructions:
1. Download the patched version (9.1.2.0 or 10.0.0.0) from HCL support portal. 2. Backup current configuration and data. 3. Install the update following HCL's upgrade documentation. 4. Restart all VersionVault Express services. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to VersionVault Express instances using firewalls or network ACLs.
Access Control Hardening
allImplement strict authentication and authorization controls for all VersionVault Express access.
🧯 If You Can't Patch
- Immediately remove internet-facing exposure and restrict network access to trusted IPs only
- Implement network monitoring and alerting for suspicious access patterns to VersionVault Express
🔍 How to Verify
Check if Vulnerable:
Check VersionVault Express version via administrative console or by examining installation directory version files.Check Version:
On Windows: Check HCL VersionVault Express installation directory for version.txt or use 'About' in administrative console. On Linux: Check /opt/hcl/versionvault/version or equivalent installation path.Verify Fix Applied:
Verify version is 9.1.2.0 or 10.0.0.0 and test that sensitive information is no longer exposed via the previously vulnerable endpoints.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to VersionVault Express configuration endpoints
- Unusual authentication patterns
- Access from unexpected IP addresses
Network Indicators:
- Unencrypted sensitive data transmission
- Unexpected connections to VersionVault Express ports (typically 371)
SIEM Query:
source="versionvault" AND (event_type="config_access" OR status="unauthorized")