CVE-2023-26097
📋 TL;DR
CVE-2023-26097 is an authorization bypass vulnerability in Telindus Apsal software that allows unauthorized users to modify application behavior. This affects organizations using Telindus Apsal version 3.14.2022.235 b for network management and monitoring.
💻 Affected Systems
- Telindus Apsal
📦 What is this software?
Apsal by Telindus
⚠️ Risk & Real-World Impact
Worst Case
Attackers could modify critical application settings, disrupt network operations, or potentially gain administrative control over the system.
Likely Case
Unauthorized users could alter monitoring configurations, disable security controls, or manipulate network device management.
If Mitigated
With proper network segmentation and access controls, impact would be limited to the application layer only.
🎯 Exploit Status
Exploitation requires network access to the Apsal interface but no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Contact Telindus for updated version
Vendor Advisory: https://cds.thalesgroup.com/en/tcs-cert/CVE-2023-26097
Restart Required: Yes
Instructions:
1. Contact Telindus support for patched version. 2. Backup current configuration. 3. Install updated version. 4. Restart Apsal services. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Apsal interface to authorized management networks only
Access Control Lists
allImplement firewall rules to limit source IP addresses that can reach Apsal
🧯 If You Can't Patch
- Isolate Apsal system on separate VLAN with strict access controls
- Implement additional authentication layer (reverse proxy with MFA) in front of Apsal
🔍 How to Verify
Check if Vulnerable:
Check Apsal version in web interface or configuration files for '3.14.2022.235 b'Check Version:
Check Apsal web interface or configuration files for version informationVerify Fix Applied:
Verify version number has changed from vulnerable version and test authorization controls📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to Apsal interface
- Configuration changes from unexpected sources
Network Indicators:
- Unusual traffic patterns to Apsal port (typically 80/443)
- Requests bypassing authentication endpoints
SIEM Query:
source_ip=* AND dest_port=80,443 AND dest_ip=Apsal_IP AND (uri_contains="/config" OR uri_contains="/admin")