CVE-2023-29930
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Genesys CIC Polycom phone provisioning TFTP servers by exploiting improper input validation in login credentials. All versions of the TFTP server are affected, potentially compromising phone provisioning systems and adjacent network resources.
💻 Affected Systems
- Genesys CIC Polycom phone provisioning TFTP Server
📦 What is this software?
Tftp Server by Genesys
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to ransomware deployment, data exfiltration, or lateral movement across the network.
Likely Case
Unauthorized access to TFTP server configuration, manipulation of phone provisioning files, or installation of backdoors.
If Mitigated
Limited impact if server is isolated, uses strong authentication, and has network segmentation.
🎯 Exploit Status
Public exploit tool TFTPlunder demonstrates remote code execution via crafted login credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not found in provided references
Restart Required: No
Instructions:
No official patch available. Follow workarounds and mitigation steps.
🔧 Temporary Workarounds
Network Isolation
linuxRestrict TFTP server access to trusted networks only
iptables -A INPUT -p tcp --dport 69 -s TRUSTED_NETWORK -j ACCEPT
iptables -A INPUT -p tcp --dport 69 -j DROP
Authentication Bypass Prevention
allImplement additional authentication layer or disable web configuration interface
🧯 If You Can't Patch
- Isolate TFTP server in separate VLAN with strict firewall rules
- Monitor for unusual TFTP traffic patterns and authentication attempts
🔍 How to Verify
Check if Vulnerable:
Test with TFTPlunder tool or attempt to access TFTP configuration page with crafted credentialsCheck Version:
Check TFTP server version in configuration interface or documentationVerify Fix Applied:
Verify network isolation is working and authentication bypass is prevented📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts with unusual credentials
- TFTP configuration page access logs
Network Indicators:
- Unusual TFTP traffic patterns
- Connection attempts to TFTP port 69 from untrusted sources
SIEM Query:
source_port:69 AND (event_type:authentication_failure OR event_type:file_upload)🔗 References
- https://github.com/YSaxon/TFTPlunder
- https://help.genesys.com/pureconnect/mergedprojects/wh_tr/mergedprojects/wh_tr_polycom_phones/desktop/configuring_the_tftp_server1.htm
- https://github.com/YSaxon/TFTPlunder
- https://help.genesys.com/pureconnect/mergedprojects/wh_tr/mergedprojects/wh_tr_polycom_phones/desktop/configuring_the_tftp_server1.htm
