CVE-2020-15639
📋 TL;DR
This is a critical path traversal vulnerability in Marvell QConvergeConsole that allows unauthenticated remote attackers to execute arbitrary code with SYSTEM privileges. The flaw exists in the decryptFile method where user-supplied paths aren't properly validated before file operations. All systems running the affected version are vulnerable to complete compromise.
💻 Affected Systems
- Marvell QConvergeConsole
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with SYSTEM privileges, allowing attackers to install malware, steal data, pivot to other systems, or disrupt operations.
Likely Case
Remote code execution leading to ransomware deployment, data exfiltration, or creation of persistent backdoors.
If Mitigated
Attackers can still attempt exploitation but will be blocked by network segmentation and proper access controls.
🎯 Exploit Status
ZDI-CAN-10496 identifier suggests detailed research exists. No authentication required makes exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 5.5.0.64 (check vendor advisory for specific fixed version)
Vendor Advisory: https://www.marvell.com/content/dam/marvell/en/public-collateral/fibre-channel/marvell-fibre-channel-security-advisory-2020-07.pdf
Restart Required: Yes
Instructions:
1. Download the latest patched version from Marvell support portal. 2. Backup current configuration. 3. Install the update following vendor documentation. 4. Restart the QConvergeConsole service. 5. Verify the patch is applied.
🔧 Temporary Workarounds
Network Segmentation
allIsolate QConvergeConsole from untrusted networks and internet access
Access Control Lists
allRestrict network access to QConvergeConsole to only trusted management IPs
🧯 If You Can't Patch
- Immediately isolate affected systems from internet and untrusted networks
- Implement strict network segmentation and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check QConvergeConsole version - if it's 5.5.0.64, the system is vulnerable.Check Version:
Check QConvergeConsole web interface or installation directory for version informationVerify Fix Applied:
Verify the version is updated to a patched release (greater than 5.5.0.64) and test path traversal attempts are blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns in decryptFile method
- Failed path traversal attempts
- Unexpected process execution with SYSTEM privileges
Network Indicators:
- Unusual outbound connections from QConvergeConsole system
- Exploitation attempts targeting the vulnerable endpoint
SIEM Query:
source="QConvergeConsole" AND (event="decryptFile" OR event="file_access") AND path CONTAINS ".."🔗 References
- https://www.marvell.com/content/dam/marvell/en/public-collateral/fibre-channel/marvell-fibre-channel-security-advisory-2020-07.pdf
- https://www.zerodayinitiative.com/advisories/ZDI-20-967/
- https://www.marvell.com/content/dam/marvell/en/public-collateral/fibre-channel/marvell-fibre-channel-security-advisory-2020-07.pdf
- https://www.zerodayinitiative.com/advisories/ZDI-20-967/
