CVE-2024-39767
📋 TL;DR
Mattermost mobile apps up to version 2.16.0 fail to properly validate push notification origins, allowing malicious servers to impersonate legitimate servers. This affects all Mattermost mobile app users connecting to potentially compromised or malicious Mattermost server instances.
💻 Affected Systems
- Mattermost Mobile App
📦 What is this software?
Mattermost Mobile by Mattermost
⚠️ Risk & Real-World Impact
Worst Case
Attackers could send deceptive push notifications appearing to come from legitimate servers, potentially tricking users into revealing credentials or performing unauthorized actions.
Likely Case
Users receive misleading notifications from spoofed servers, causing confusion and potential information disclosure through social engineering.
If Mitigated
With proper server validation, only legitimate servers can send notifications, maintaining notification integrity and user trust.
🎯 Exploit Status
Requires control of a malicious Mattermost server instance that users connect to. Exploitation depends on social engineering users to interact with spoofed notifications.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.16.1
Vendor Advisory: https://mattermost.com/security-updates
Restart Required: Yes
Instructions:
1. Update Mattermost mobile app to version 2.16.1 or later from official app stores. 2. Restart the mobile app after update. 3. Verify the update was successful by checking app version in settings.
🔧 Temporary Workarounds
Disable Push Notifications
allTemporarily disable push notifications in the Mattermost mobile app settings to prevent exploitation.
Open Mattermost app > Settings > Notifications > Push Notifications > Turn Off
🧯 If You Can't Patch
- Educate users to be cautious of unexpected push notifications and verify server URLs before interacting
- Monitor for unusual notification patterns or user reports of suspicious notifications
🔍 How to Verify
Check if Vulnerable:
Check the Mattermost mobile app version in app settings. If version is 2.16.0 or earlier, the app is vulnerable.Check Version:
Open Mattermost app > Settings > About > VersionVerify Fix Applied:
Verify the app version is 2.16.1 or later in the app settings after updating.📡 Detection & Monitoring
Log Indicators:
- User reports of unexpected push notifications
- Notifications from unfamiliar server URLs
Network Indicators:
- Unusual push notification traffic patterns from non-standard servers
SIEM Query:
Search for user reports containing 'unexpected notification', 'spoofed notification', or 'wrong server' in Mattermost logs