CVE-2021-47841
📋 TL;DR
SnipCommand 0.1.0 contains a persistent cross-site scripting (XSS) vulnerability that allows attackers to inject malicious JavaScript payloads into command snippets. When users view these compromised snippets, the malicious code executes in their browser, potentially leading to remote command execution. This affects all users of SnipCommand 0.1.0 who have not applied security controls.
💻 Affected Systems
- SnipCommand
⚠️ 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 gain remote code execution on the server, compromise user sessions, steal credentials, and pivot to other systems in the network.
Likely Case
Attackers steal session cookies, perform actions as authenticated users, and potentially execute commands through the web interface.
If Mitigated
Limited to client-side script execution with proper input validation and output encoding preventing payload execution.
🎯 Exploit Status
Exploit requires authentication to create/modify snippets. Public exploit code exists on Exploit-DB (ID 49829).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/gurayyarar/SnipCommand
Restart Required: No
Instructions:
1. Check the GitHub repository for any security updates. 2. If no patch exists, consider alternative software or implement workarounds. 3. Monitor the repository for security fixes.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side input validation and output encoding for all user inputs, especially file and title fields.
Content Security Policy
allImplement a strict Content Security Policy header to prevent inline script execution.
Content-Security-Policy: default-src 'self'; script-src 'self'
🧯 If You Can't Patch
- Disable or restrict access to SnipCommand application
- Implement web application firewall rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Test by attempting to inject JavaScript payloads into file or title fields and checking if they execute when viewing snippets.Check Version:
Check package.json or application metadata for version informationVerify Fix Applied:
Attempt the same injection tests after implementing fixes; payloads should be sanitized and not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript payloads in file/title fields
- Multiple failed login attempts followed by snippet creation
Network Indicators:
- HTTP requests containing script tags or JavaScript in POST parameters
- Unusual outbound connections from the application server
SIEM Query:
source="snipcommand.log" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")