CVE-2023-7114
📋 TL;DR
Mattermost versions 2.10.0 and earlier contain a CSRF vulnerability due to improper sanitization of deeplink paths. This allows attackers to trick authenticated users into performing unintended actions on the Mattermost server. All organizations running vulnerable Mattermost instances are affected.
💻 Affected Systems
- Mattermost
📦 What is this software?
Mattermost by Mattermost
Mattermost by Mattermost
⚠️ Risk & Real-World Impact
Worst Case
Attackers could force users to change account settings, post malicious content, delete channels, or perform administrative actions without consent.
Likely Case
Attackers create phishing campaigns that trick users into clicking malicious links, leading to unauthorized actions within their Mattermost workspace.
If Mitigated
With proper CSRF protections and user awareness, impact is limited to isolated incidents with minimal data exposure.
🎯 Exploit Status
Exploitation requires user interaction (clicking malicious link) but is technically simple once the malicious payload is crafted.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.10.1 or later
Vendor Advisory: https://mattermost.com/security-updates
Restart Required: Yes
Instructions:
1. Backup your Mattermost instance. 2. Upgrade to Mattermost 2.10.1 or later. 3. Restart the Mattermost service. 4. Verify the upgrade was successful.
🔧 Temporary Workarounds
Disable Deep Links
allTemporarily disable deep link functionality in Mattermost configuration
Edit config.json and set 'EnableDeepLinking' to false
🧯 If You Can't Patch
- Implement strict Content Security Policy headers
- Use web application firewall rules to block suspicious deeplink patterns
🔍 How to Verify
Check if Vulnerable:
Check Mattermost version via web interface or command line. If version is 2.10.0 or earlier, you are vulnerable.Check Version:
mattermost versionVerify Fix Applied:
Verify version is 2.10.1 or later and test deeplink functionality with security testing tools.📡 Detection & Monitoring
Log Indicators:
- Unusual deeplink requests
- Multiple failed CSRF token validations
- Suspicious user actions from unexpected sources
Network Indicators:
- HTTP requests with crafted deeplink parameters
- External domains making requests to Mattermost deeplink endpoints
SIEM Query:
source="mattermost" AND (uri="*/api/v4/deeplink/*" OR message="*CSRF*" OR message="*deeplink*")