CVE-2012-6664
📋 TL;DR
This vulnerability allows remote attackers to read or write arbitrary files on systems running Distinct Intranet Servers TFTP Server 3.10 and earlier. Attackers can exploit directory traversal via specially crafted TFTP commands containing '..' sequences. Organizations using this TFTP server software are affected.
💻 Affected Systems
- Distinct Intranet Servers TFTP Server
⚠️ 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 through arbitrary file writes (potentially creating backdoors, modifying system files) or sensitive data exfiltration through arbitrary file reads.
Likely Case
Unauthorized file access leading to data theft, configuration file modification, or planting malicious files for further exploitation.
If Mitigated
Limited impact if TFTP server runs with minimal privileges, filesystem permissions restrict access, and network segmentation isolates the service.
🎯 Exploit Status
Exploit code is publicly available and requires no authentication. Simple directory traversal attacks can be automated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.11 or later
Vendor Advisory: https://www.distinct.com/
Restart Required: Yes
Instructions:
1. Download latest version from Distinct website. 2. Backup configuration. 3. Install update. 4. Restart TFTP service. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict TFTP server access to trusted networks only
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="TRUSTED_NETWORK" port protocol="udp" port="69" accept'
netsh advfirewall firewall add rule name="Restrict TFTP" dir=in action=allow protocol=UDP localport=69 remoteip=TRUSTED_NETWORK
Service Account Hardening
allRun TFTP service with minimal privileges
sc config "DistinctTFTP" obj= "NT AUTHORITY\LocalService"
setfacl -m u:tfptuser:rx /var/lib/tftpboot
🧯 If You Can't Patch
- Disable TFTP server if not required
- Implement strict filesystem permissions and monitor for unauthorized file access
🔍 How to Verify
Check if Vulnerable:
Check TFTP server version in administration interface or via 'strings' command on binary looking for version 3.10 or earlierCheck Version:
On Windows: Check program version in Control Panel. On Linux: strings /usr/bin/distinct-tftp | grep -i versionVerify Fix Applied:
Verify version is 3.11 or later and test with directory traversal attempts using TFTP client📡 Detection & Monitoring
Log Indicators:
- TFTP requests containing '..' sequences in filenames
- Unauthorized file access attempts in system logs
Network Indicators:
- TFTP traffic with unusual filename patterns
- TFTP requests to sensitive directory paths
SIEM Query:
source="tftp.log" AND (filename="*..*" OR filename="*/../*")