CVE-2023-51839
📋 TL;DR
CVE-2023-51839 is a cryptographic vulnerability in DeviceFarmer STF (Smartphone Test Farm) version 3.6.6 that uses broken or risky cryptographic algorithms, potentially allowing attackers to decrypt sensitive data or bypass authentication. This affects organizations using STF for mobile device testing and management. The high CVSS score of 9.1 indicates critical severity.
💻 Affected Systems
- DeviceFarmer STF
📦 What is this software?
Smartphone Test Farm by Devicefarmer
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of STF infrastructure, unauthorized access to connected mobile devices, theft of sensitive testing data, and potential lateral movement to internal networks.
Likely Case
Unauthorized access to STF dashboard, manipulation of device testing sessions, and exposure of device credentials or API keys.
If Mitigated
Limited impact with proper network segmentation and monitoring, though cryptographic weaknesses remain exploitable if accessed.
🎯 Exploit Status
Exploitation requires network access to STF services but cryptographic attacks are well-documented. Public proof-of-concept code exists in GitHub repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.6.7 or later
Vendor Advisory: https://github.com/DeviceFarmer/stf/issues/736
Restart Required: Yes
Instructions:
1. Backup current STF configuration and data. 2. Stop all STF services. 3. Update STF to version 3.6.7 or later using npm: 'npm update -g stf'. 4. Verify the update with 'stf --version'. 5. Restart STF services.
🔧 Temporary Workarounds
Network Isolation
linuxRestrict network access to STF services to trusted IPs only
iptables -A INPUT -p tcp --dport 7100 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 7100 -j DROP
Disable Vulnerable Features
allTemporarily disable STF features that use the broken cryptography
Modify STF config to disable authentication features if not critical
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit STF access
- Monitor STF logs for unusual authentication attempts or cryptographic errors
🔍 How to Verify
Check if Vulnerable:
Check STF version with 'stf --version' and verify if it's 3.6.6Check Version:
stf --versionVerify Fix Applied:
After update, confirm version is 3.6.7 or later with 'stf --version'📡 Detection & Monitoring
Log Indicators:
- Failed cryptographic operations
- Unexpected authentication attempts
- Multiple connection attempts to STF ports
Network Indicators:
- Unusual traffic patterns to STF default ports (7100, 7110)
- Multiple failed TLS/SSL handshakes
SIEM Query:
source="stf.log" AND ("crypto" OR "authentication" OR "decrypt") AND severity=ERROR🔗 References
- https://github.com/DeviceFarmer/stf
- https://github.com/DeviceFarmer/stf/issues/736
- https://github.com/tianjk99/Cryptographic-Misuses/blob/main/CVE-2023-51839.md
- https://github.com/DeviceFarmer/stf
- https://github.com/DeviceFarmer/stf/issues/736
- https://github.com/tianjk99/Cryptographic-Misuses/blob/main/CVE-2023-51839.md
