CVE-2024-52032
📋 TL;DR
This vulnerability in Mattermost allows attackers to discover private channel names they shouldn't have access to when using Elasticsearch v8 with the channel switcher feature. It affects organizations running vulnerable Mattermost versions with Elasticsearch enabled. The exposure is limited to channel name disclosure, not message content.
💻 Affected Systems
- Mattermost
📦 What is this software?
Mattermost Server by Mattermost
Mattermost Server by Mattermost
Mattermost Server by Mattermost
Mattermost Server by Mattermost
Mattermost Server by Mattermost
Mattermost Server by Mattermost
⚠️ Risk & Real-World Impact
Worst Case
An attacker could map organizational structure by discovering all private channel names, potentially identifying sensitive projects, teams, or discussions.
Likely Case
Internal users could discover private channel names they're not authorized to see, violating intended access controls and potentially learning about confidential initiatives.
If Mitigated
With proper network segmentation and access controls, the impact is limited to internal users who already have some level of system access.
🎯 Exploit Status
Requires authenticated access to Mattermost and Elasticsearch v8 to be enabled. The vulnerability is in the search query logic.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Mattermost 10.0.1 and 9.11.3
Vendor Advisory: https://mattermost.com/security-updates
Restart Required: Yes
Instructions:
1. Backup your Mattermost installation and database. 2. Download Mattermost 10.0.1 or 9.11.3 from official sources. 3. Stop Mattermost service. 4. Replace existing installation with patched version. 5. Restart Mattermost service. 6. Verify functionality.
🔧 Temporary Workarounds
Disable Elasticsearch v8
allTemporarily disable Elasticsearch v8 integration to prevent exploitation while planning upgrade.
Edit config.json and set 'EnableElasticsearch' to false
Restart Mattermost service
Restrict Channel Switcher Access
allLimit who can use the channel switcher feature through permissions.
Use Mattermost System Console to adjust channel switcher permissions
🧯 If You Can't Patch
- Disable Elasticsearch v8 integration completely
- Implement strict network segmentation to limit who can access the Mattermost instance
🔍 How to Verify
Check if Vulnerable:
Check Mattermost version via System Console > About Mattermost, and verify Elasticsearch v8 is enabled in config.json.Check Version:
From Mattermost CLI: 'mattermost version' or check System Console > About MattermostVerify Fix Applied:
After patching, verify version shows 10.0.1+ or 9.11.3+, and test that private channel names are not exposed in search results.📡 Detection & Monitoring
Log Indicators:
- Unusual search patterns for channel names
- Multiple failed search attempts for private channels
Network Indicators:
- Increased search API calls to Elasticsearch from Mattermost
SIEM Query:
source='mattermost' AND (event='search' OR event='channel_switch') AND result='success' AND channel_type='private'