CVE-2023-6254
📋 TL;DR
This vulnerability in OTRS AgentInterface and ExternalInterface allows attackers to read plain text passwords that are inadvertently sent back to clients in server responses. It affects OTRS installations from version 8.0.X through 8.0.37. Attackers can exploit this to obtain sensitive authentication credentials.
💻 Affected Systems
- OTRS
📦 What is this software?
Otrs by Otrs
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative credentials leading to complete system compromise, data theft, and lateral movement within the network.
Likely Case
Attackers obtain user credentials allowing unauthorized access to ticketing systems, customer data, and internal communications.
If Mitigated
Limited credential exposure affecting only specific user accounts with proper access controls limiting damage.
🎯 Exploit Status
Exploitation requires access to the interface but is technically simple once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.0.38 or later
Vendor Advisory: https://otrs.com/release-notes/otrs-security-advisory-2023-11/
Restart Required: Yes
Instructions:
1. Backup your OTRS installation and database. 2. Download OTRS 8.0.38 or later from the official repository. 3. Follow the OTRS upgrade documentation for your specific deployment. 4. Restart OTRS services after upgrade.
🔧 Temporary Workarounds
Disable ExternalInterface
allTemporarily disable the customer-facing ExternalInterface if not essential
Modify OTRS configuration to disable ExternalInterface access
Network Access Restrictions
allRestrict access to OTRS interfaces to trusted IP addresses only
Configure firewall rules to limit access to OTRS ports
🧯 If You Can't Patch
- Implement strict network segmentation to isolate OTRS systems
- Enable comprehensive logging and monitoring for credential access attempts
🔍 How to Verify
Check if Vulnerable:
Check OTRS version via Admin interface or by examining installed package versionCheck Version:
Check OTRS System Configuration → About in Admin interfaceVerify Fix Applied:
Verify OTRS version is 8.0.38 or later and test that password data is no longer exposed in responses📡 Detection & Monitoring
Log Indicators:
- Unusual authentication patterns
- Multiple failed login attempts followed by successful access
- Access from unexpected IP addresses
Network Indicators:
- Unusual outbound data transfers from OTRS server
- Traffic patterns suggesting credential harvesting
SIEM Query:
source="otrs" AND (event_type="authentication" OR event_type="access") AND (status="success" OR status="failure") | stats count by src_ip, user