CVE-2025-44017
📋 TL;DR
The Gunosy mobile app contains an information disclosure vulnerability where JSON Web Tokens (JWTs) may be leaked in outbound communications. If users access a specially crafted URL, attackers could intercept these tokens. This affects all users of vulnerable Gunosy app versions.
💻 Affected Systems
- Gunosy mobile application
⚠️ 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
Attackers obtain valid JWTs and gain unauthorized access to user accounts, potentially accessing personal data, performing actions as the user, or escalating privileges within the app ecosystem.
Likely Case
Attackers capture JWTs through man-in-the-middle attacks or malicious links, leading to account compromise and unauthorized access to user-specific app functionality.
If Mitigated
With proper network segmentation and monitoring, token leakage could be detected and contained before exploitation, limiting impact to isolated incidents.
🎯 Exploit Status
Exploitation requires user interaction (clicking crafted URL) and network interception capabilities. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest app store updates for Gunosy
Vendor Advisory: https://jvn.jp/en/jp/JVN47404248/
Restart Required: No
Instructions:
1. Update Gunosy app to latest version from official app stores. 2. Ensure automatic updates are enabled. 3. Verify update completion by checking app version in settings.
🔧 Temporary Workarounds
Disable automatic URL handling
allPrevent app from automatically opening external URLs
No specific commands - configure through device/app settings
Use VPN with certificate pinning
allImplement VPN with certificate pinning to prevent MITM attacks
🧯 If You Can't Patch
- Implement network monitoring for JWT leakage in outbound traffic
- Restrict app network access to trusted domains only using firewall rules
🔍 How to Verify
Check if Vulnerable:
Check app version against latest release notes. Monitor network traffic for JWT tokens in cleartext or predictable locations.Check Version:
Check app version in device settings > Apps > Gunosy > App InfoVerify Fix Applied:
Update to latest version and test with network monitoring tools to confirm JWTs are no longer leaked in outbound communications.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication patterns
- Multiple failed login attempts from new locations
- JWTs appearing in unexpected log entries
Network Indicators:
- JWTs transmitted in URL parameters or headers to untrusted domains
- Unexpected outbound connections containing authentication tokens
SIEM Query:
source="network_traffic" AND (token="eyJ" OR "Authorization: Bearer") AND dest_ip NOT IN [trusted_domains]