CVE-2020-25493
📋 TL;DR
The Oclean mobile application version 2.1.2 transmits sensitive data over unencrypted HTTP connections, allowing attackers on the same network to intercept communications. The data is encrypted with a weak XOR cipher using a hardcoded key that can be easily decrypted, exposing user information. This affects all users of the vulnerable Oclean mobile application.
💻 Affected Systems
- Oclean Mobile Application
📦 What is this software?
Oclean by Oclean
⚠️ Risk & Real-World Impact
Worst Case
Attackers intercept and decrypt sensitive user data including personal information, device usage patterns, and authentication credentials, leading to identity theft, account compromise, and privacy violations.
Likely Case
Eavesdropping on user data transmitted between the app and servers, potentially exposing personal information and usage statistics to malicious actors on the same network.
If Mitigated
Limited exposure with proper network segmentation and monitoring, but fundamental vulnerability remains in the application's communication protocol.
🎯 Exploit Status
Public GitHub repository demonstrates traffic decryption. Exploitation requires network access but no authentication to the application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://oclean.com
Restart Required: No
Instructions:
1. Check for updates in Google Play Store or Apple App Store. 2. Update to latest version if available. 3. If no update available, consider discontinuing use until patch is released.
🔧 Temporary Workarounds
Use VPN on Mobile Device
allRoute all mobile traffic through a secure VPN to encrypt network communications end-to-end.
Avoid Untrusted Networks
allOnly use the application on trusted, secure networks to reduce exposure to man-in-the-middle attacks.
🧯 If You Can't Patch
- Discontinue use of the vulnerable application until a secure version is available
- Implement network monitoring to detect interception attempts and unusual traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check app version in mobile device settings. If version is 2.1.2, the application is vulnerable.Check Version:
On Android: Settings > Apps > Oclean > App info. On iOS: Settings > General > iPhone Storage > OcleanVerify Fix Applied:
Update application and verify version is newer than 2.1.2. Monitor network traffic to confirm HTTPS is being used instead of HTTP.📡 Detection & Monitoring
Log Indicators:
- Unusual network traffic patterns from mobile devices
- HTTP requests to oclean domains instead of HTTPS
Network Indicators:
- HTTP traffic to oclean.com domains
- XOR-encrypted payloads in network captures
SIEM Query:
source_ip IN (mobile_device_ips) AND dest_domain CONTAINS 'oclean.com' AND protocol = 'HTTP'🔗 References
- http://oclean.com
- https://github.com/c3r34lk1ll3r/decrypt-oclean-traffic
- https://play.google.com/store/apps/details?id=com.yunding.noopsychebrushforeign
- http://oclean.com
- https://github.com/c3r34lk1ll3r/decrypt-oclean-traffic
- https://play.google.com/store/apps/details?id=com.yunding.noopsychebrushforeign
