CVE-2024-11318
📋 TL;DR
An IDOR vulnerability in AbsysNet 2.3.1 allows remote attackers to hijack unauthenticated user sessions by brute-forcing session identifiers on the /cgi-bin/ocap/ endpoint. This affects all systems running the vulnerable AbsysNet version, potentially compromising user accounts and data.
💻 Affected Systems
- AbsysNet
⚠️ 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
Attackers gain unauthorized access to multiple user accounts, leading to data theft, privilege escalation, and complete system compromise.
Likely Case
Session hijacking of unauthenticated users, allowing attackers to impersonate legitimate users and access their data.
If Mitigated
Limited impact with proper session management, rate limiting, and access controls preventing successful brute-force attacks.
🎯 Exploit Status
Exploitation requires brute-forcing session IDs, which is straightforward with automated tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/idor-vulnerability-absysnet
Restart Required: No
Instructions:
Check vendor advisory for updates; apply patches when available. If no patch, implement workarounds immediately.
🔧 Temporary Workarounds
Implement Rate Limiting
allLimit requests to the /cgi-bin/ocap/ endpoint to prevent brute-force attacks.
Configure web server (e.g., Apache, Nginx) rate limiting rules for the endpoint.
Restrict Access to Endpoint
allBlock or restrict access to the vulnerable endpoint using firewall rules or access controls.
Use firewall to block external access to /cgi-bin/ocap/ or restrict to trusted IPs.
🧯 If You Can't Patch
- Monitor logs for brute-force attempts on the /cgi-bin/ocap/ endpoint.
- Implement strong session management with unpredictable session IDs and short timeouts.
🔍 How to Verify
Check if Vulnerable:
Check if AbsysNet version is 2.3.1 and the /cgi-bin/ocap/ endpoint is accessible.Check Version:
Check AbsysNet documentation or system logs for version information.Verify Fix Applied:
Verify that rate limiting or access restrictions are in place and effective.📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to /cgi-bin/ocap/ from single IPs, unusual session ID patterns.
Network Indicators:
- High volume of requests to the vulnerable endpoint, especially from unknown sources.
SIEM Query:
source_ip=* AND uri_path="/cgi-bin/ocap/" AND count > 100 within 1 minute