CVE-2023-2534
📋 TL;DR
An improper authorization vulnerability in OTRS 8's Websocket API backend allows authenticated agents to track user behavior and gain live system insights. Attackers can correlate user IDs with real names via ticket histories and potentially gather other sensitive data. This affects OTRS installations from version 8.0.X before 8.0.32.
💻 Affected Systems
- OTRS AG OTRS
📦 What is this software?
Otrs by Otrs
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain comprehensive user behavior tracking, correlate all user IDs with real identities, harvest sensitive data through fuzzing, and cause server performance degradation through event flooding.
Likely Case
Authenticated agents abuse permissions to monitor colleague activities, track user behavior patterns, and potentially access sensitive information through existing ticket histories.
If Mitigated
With proper authorization controls, agents can only access data relevant to their roles, preventing unauthorized user tracking and data correlation.
🎯 Exploit Status
Exploitation requires authenticated agent access but involves simple API misuse rather than complex technical attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.0.32
Vendor Advisory: https://otrs.com/release-notes/otrs-security-advisory-2023-03/
Restart Required: Yes
Instructions:
1. Backup your OTRS installation and database. 2. Download OTRS 8.0.32 or later from official vendor. 3. Follow OTRS upgrade documentation for your specific deployment. 4. Restart OTRS services after upgrade.
🔧 Temporary Workarounds
Disable Websocket API
allTemporarily disable the vulnerable Websocket API backend if not required for operations
Modify OTRS configuration to disable Websocket functionality
Restrict Agent Permissions
allReview and reduce agent permissions to minimum required for their roles
Use OTRS admin interface to audit and modify agent group permissions
🧯 If You Can't Patch
- Implement strict network segmentation to isolate OTRS from untrusted networks
- Enhance monitoring of Websocket API usage and alert on abnormal subscription patterns
🔍 How to Verify
Check if Vulnerable:
Check OTRS version via admin interface or by examining installed package versionCheck Version:
otrs.Console.pl Maint::Config::Dump --options="Version"Verify Fix Applied:
Confirm version is 8.0.32 or later and test that agents cannot subscribe to unauthorized push events📡 Detection & Monitoring
Log Indicators:
- Unusual volume of Websocket subscriptions from single agents
- Agent accounts accessing ticket histories for users outside their groups
Network Indicators:
- High frequency of Websocket connections from single IPs
- Abnormal push event traffic patterns
SIEM Query:
source="otrs.log" AND ("Websocket subscription" OR "push event") AND count by agent_id > threshold