CVE-2024-37865
📋 TL;DR
This vulnerability in S3Browser allows remote attackers to obtain sensitive information from S3-compatible storage systems through improper certificate validation. It affects users of S3Browser versions 11.4.5 and 10.9.9 who connect to S3-compatible storage services.
💻 Affected Systems
- S3Browser
📦 What is this software?
S3 Browser by S3browser
⚠️ Risk & Real-World Impact
Worst Case
Attackers could intercept and decrypt sensitive data transmitted between S3Browser and S3-compatible storage, potentially exposing credentials, configuration details, and stored data.
Likely Case
Information disclosure of S3 storage credentials, bucket contents, or configuration data when connecting to malicious or compromised S3 endpoints.
If Mitigated
Limited impact if using only trusted S3 endpoints with proper network segmentation and monitoring.
🎯 Exploit Status
Exploitation requires user to connect to a malicious S3 endpoint; proof-of-concept demonstrates certificate validation bypass.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 11.5.7
Vendor Advisory: https://s3browser.com/changelog.aspx
Restart Required: Yes
Instructions:
1. Download S3Browser v11.5.7 or later from official website. 2. Run installer. 3. Restart S3Browser. 4. Verify version in Help > About.
🔧 Temporary Workarounds
Restrict S3 Endpoints
allConfigure firewall rules to only allow connections to trusted S3 endpoints
Use Alternative Clients
allTemporarily use alternative S3 clients like AWS CLI, Cyberduck, or rclone
🧯 If You Can't Patch
- Monitor network traffic for connections to unknown S3 endpoints
- Implement strict outbound firewall rules limiting S3 connections to approved endpoints only
🔍 How to Verify
Check if Vulnerable:
Check S3Browser version in Help > About menu; if version is 11.4.5 or 10.9.9, system is vulnerable.Check Version:
Not applicable - check via S3Browser GUI Help > About menuVerify Fix Applied:
Verify version is 11.5.7 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Failed SSL/TLS certificate validation attempts
- Connections to unusual S3 endpoints
Network Indicators:
- Outbound connections to non-standard S3 endpoints on port 443
- SSL/TLS handshakes with self-signed certificates to S3 services
SIEM Query:
destination_port:443 AND (destination_ip NOT IN [trusted_s3_ips]) AND protocol:ssl