CVE-2021-41280
📋 TL;DR
CVE-2021-41280 is a critical command injection vulnerability in Sharetribe Go marketplace software that allows attackers to execute arbitrary operating system commands. This affects installations that don't have the AWS SNS notification token configured, which is the default configuration. Attackers can potentially gain full control of affected systems.
💻 Affected Systems
- Sharetribe Go
📦 What is this software?
Sharetribe by Sharetribe
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, steal data, install malware, pivot to other systems, and maintain persistent access.
Likely Case
Remote code execution leading to data theft, system takeover, and potential ransomware deployment on vulnerable installations.
If Mitigated
No impact if proper configuration is applied or patched version is installed.
🎯 Exploit Status
Command injection vulnerabilities are typically easy to exploit once the attack vector is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.2.1
Vendor Advisory: https://github.com/sharetribe/sharetribe/security/advisories/GHSA-hjjc-p9hr-424c
Restart Required: Yes
Instructions:
1. Backup your Sharetribe Go installation and database. 2. Update to version 10.2.1 or later using your package manager or by downloading from GitHub. 3. Restart the application server. 4. Verify the update was successful.
🔧 Temporary Workarounds
Configure SNS Notification Token
allSet a secret AWS SNS notification token to prevent exploitation
Set configuration parameter: sns_notification_token = 'your_secret_token_here'
🧯 If You Can't Patch
- Immediately configure the sns_notification_token parameter with a strong secret value
- Implement network segmentation and restrict access to Sharetribe Go instances
🔍 How to Verify
Check if Vulnerable:
Check if sns_notification_token is unset in configuration and version is below 10.2.1Check Version:
Check Sharetribe Go version in admin panel or application configurationVerify Fix Applied:
Verify version is 10.2.1 or higher and sns_notification_token is configured📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns
- Suspicious AWS SNS notification attempts
- Error logs containing command injection attempts
Network Indicators:
- Unexpected outbound connections from Sharetribe Go server
- Traffic to unexpected AWS SNS endpoints
SIEM Query:
Search for command injection patterns in web application logs: *cmd* OR *exec* OR *system* OR *shell*🔗 References
- https://github.com/sharetribe/sharetribe/commit/5b844f8108c5458d89f0d7ba974f42d7917b5f80
- https://github.com/sharetribe/sharetribe/releases/tag/v10.2.1
- https://github.com/sharetribe/sharetribe/security/advisories/GHSA-hjjc-p9hr-424c
- https://github.com/sharetribe/sharetribe/commit/5b844f8108c5458d89f0d7ba974f42d7917b5f80
- https://github.com/sharetribe/sharetribe/releases/tag/v10.2.1
- https://github.com/sharetribe/sharetribe/security/advisories/GHSA-hjjc-p9hr-424c
