CVE-2025-61114
📋 TL;DR
This vulnerability allows attackers to bypass authentication in the 2nd Line Android app by brute-forcing user tokens, since the server only validates the first character. All users of affected app versions are at risk of having their accounts compromised, leading to unauthorized access to personal data.
💻 Affected Systems
- 2nd Line Android App
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all user accounts, exposing sensitive personal data, messages, and potentially financial information to attackers.
Likely Case
Targeted account takeovers leading to privacy breaches, unauthorized access to conversations, and potential identity theft.
If Mitigated
Limited exposure if strong network segmentation and monitoring are in place, but authentication bypass remains possible.
🎯 Exploit Status
Attack requires network access to the app's API endpoints but no authentication. Token brute-forcing is trivial due to single-character validation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Check Google Play Store for app updates 2. Update to latest version if available 3. Restart the app after update
🔧 Temporary Workarounds
Disable App Usage
androidTemporarily disable or uninstall the vulnerable app until a patch is available
adb uninstall com.mysecondline.app
🧯 If You Can't Patch
- Monitor network traffic for unusual authentication attempts or token brute-forcing patterns
- Implement rate limiting and IP blocking for failed authentication attempts at network perimeter
🔍 How to Verify
Check if Vulnerable:
Check app version in Android Settings > Apps > 2nd Line > App info. If version is 1.2.92 or lower, you are vulnerable.Check Version:
adb shell dumpsys package com.mysecondline.app | grep versionNameVerify Fix Applied:
Verify app version is higher than 1.2.92. Test authentication with invalid tokens to ensure proper validation.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts with varying tokens
- Successful logins from unusual IP addresses
Network Indicators:
- High volume of authentication requests to app API endpoints
- Pattern of requests with systematically changing token values
SIEM Query:
source="app_server" AND (event_type="auth_failure" AND token LIKE "?%") | stats count by src_ip