CVE-2022-25760
📋 TL;DR
CVE-2022-25760 is a code injection vulnerability in the accesslog npm package that allows attackers to execute arbitrary JavaScript code on the host system. The vulnerability occurs when attacker-controlled input is passed to the format option of the package's constructor function. Any application using the vulnerable accesslog package is affected.
💻 Affected Systems
- accesslog npm package
📦 What is this software?
Accesslog by Accesslog Project
⚠️ 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
Complete compromise of the host system with full remote code execution, data exfiltration, and lateral movement capabilities.
Likely Case
Server compromise allowing data theft, installation of backdoors, or use as part of a botnet.
If Mitigated
Limited impact if input validation prevents malicious format strings from reaching the vulnerable function.
🎯 Exploit Status
Exploitation is straightforward when attacker-controlled input reaches the vulnerable function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not version-specific - requires manual code review and input validation
Vendor Advisory: https://github.com/carlos8f/node-accesslog/security/advisories
Restart Required: Yes
Instructions:
1. Review code for usage of accesslog constructor with user input. 2. Implement strict input validation/sanitization. 3. Restart the application after changes.
🔧 Temporary Workarounds
Input Validation
allImplement strict validation to ensure only trusted format strings reach the accesslog constructor.
Package Replacement
allReplace accesslog package with alternative logging solutions that don't use Function constructor.
npm uninstall accesslog
npm install [alternative-package]
🧯 If You Can't Patch
- Implement strict input validation at all entry points where format strings could be supplied.
- Use network segmentation to isolate vulnerable systems and implement strict egress filtering.
🔍 How to Verify
Check if Vulnerable:
Check if your application uses the accesslog package and passes user input to the format parameter.Check Version:
npm list accesslogVerify Fix Applied:
Verify that user input is properly validated before reaching the accesslog constructor.📡 Detection & Monitoring
Log Indicators:
- Unusual format strings in accesslog configuration
- Suspicious JavaScript execution patterns
Network Indicators:
- Unexpected outbound connections from the application server
SIEM Query:
source="application_logs" AND ("accesslog" OR "Function constructor") AND suspicious_pattern