CVE-2020-7675
📋 TL;DR
CVE-2020-7675 is a critical vulnerability in cd-messenger that allows arbitrary code execution via the 'color' argument due to improper use of the eval() function. This affects users of cd-messenger versions up to 2.7.26, potentially enabling attackers to run malicious code on the system.
💻 Affected Systems
- cd-messenger
📦 What is this software?
Cd Messenger by Cd Messenger Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise, allowing attackers to execute arbitrary commands, steal data, or deploy ransomware.
Likely Case
Remote code execution leading to unauthorized access, data exfiltration, or service disruption.
If Mitigated
Limited impact if input validation or sandboxing is implemented, but still poses a risk if exploited.
🎯 Exploit Status
Exploitation is straightforward as it involves injecting malicious code into the 'color' parameter, with public proof-of-concept available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 2.7.26 (check for updates beyond this version)
Vendor Advisory: https://snyk.io/vuln/SNYK-JS-CDMESSENGER-571493
Restart Required: Yes
Instructions:
1. Update cd-messenger to the latest version. 2. Verify the update by checking the version number. 3. Restart the application to apply changes.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation to block malicious code in the 'color' argument.
Implement code to sanitize user input before processing, e.g., using regex to allow only safe characters.
Disable or Replace eval() Usage
allModify the code to avoid using eval() for the 'color' argument, using safer alternatives like JSON parsing.
Replace eval() with a secure function, e.g., use a predefined color map or validation library.
🧯 If You Can't Patch
- Isolate the affected system from the network to limit attack surface.
- Implement strict access controls and monitor for suspicious activity related to the 'color' parameter.
🔍 How to Verify
Check if Vulnerable:
Check the cd-messenger version; if it is 2.7.26 or earlier, it is vulnerable.Check Version:
npm list cd-messenger (for Node.js environments) or check package.json for version.Verify Fix Applied:
Update to a version after 2.7.26 and confirm the version number has increased.📡 Detection & Monitoring
Log Indicators:
- Unusual eval() calls or errors in application logs, especially with suspicious 'color' parameter values.
Network Indicators:
- Unexpected outbound connections or data exfiltration from the system running cd-messenger.
SIEM Query:
Example: search for 'eval' AND 'color' in application logs or network traffic to detect exploitation attempts.