CVE-2023-46586
📋 TL;DR
CVE-2023-46586 is a buffer overflow vulnerability in weborf web server versions 0.17-0.20 due to improper null termination of CGI script paths. This allows attackers to execute arbitrary code on affected systems. Organizations running vulnerable weborf versions with CGI functionality enabled are affected.
💻 Affected Systems
- weborf
⚠️ 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
Remote code execution leading to complete system compromise, data theft, and lateral movement within the network.
Likely Case
Remote code execution allowing attackers to run arbitrary commands with web server privileges, potentially leading to data exfiltration or service disruption.
If Mitigated
Denial of service or limited information disclosure if proper network segmentation and least privilege controls are implemented.
🎯 Exploit Status
Exploitation requires understanding of buffer overflow techniques and CGI path manipulation, but no authentication is needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0 or later
Vendor Advisory: https://github.com/ltworf/weborf/commit/49824204add55aab0568d90a6b1e7c822d32120d
Restart Required: Yes
Instructions:
1. Stop weborf service. 2. Update to weborf version 1.0 or later. 3. Restart weborf service. 4. Verify the fix by checking version and testing CGI functionality.
🔧 Temporary Workarounds
Disable CGI functionality
linuxDisable CGI execution in weborf configuration to prevent exploitation of this vulnerability.
Edit weborf configuration file and set 'cgi = false' or remove CGI-related directives
Network segmentation
linuxRestrict access to weborf service to trusted networks only.
iptables -A INPUT -p tcp --dport [weborf_port] -s [trusted_network] -j ACCEPT
iptables -A INPUT -p tcp --dport [weborf_port] -j DROP
🧯 If You Can't Patch
- Disable CGI functionality completely in weborf configuration
- Implement strict network access controls to limit exposure to trusted sources only
🔍 How to Verify
Check if Vulnerable:
Check weborf version with 'weborf --version' or examine installed package version. If version is 0.17, 0.18, 0.19, or 0.20, the system is vulnerable.Check Version:
weborf --versionVerify Fix Applied:
After patching, verify version is 1.0 or later with 'weborf --version'. Test CGI functionality to ensure it still works properly without crashes.📡 Detection & Monitoring
Log Indicators:
- Unusual CGI script execution patterns
- Weborf process crashes or abnormal termination
- Suspicious HTTP requests with malformed paths
Network Indicators:
- HTTP requests with unusually long CGI paths
- Multiple failed CGI execution attempts
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
source="weborf" AND (event="segmentation fault" OR event="buffer overflow" OR cgi_path_length>threshold)