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How CVE-2025-4759 Works
CVE-2025-4759 affects lockfile-lint-api versions before 5.9.2, where improper validation of the `resolved` attribute in package URLs allows attackers to bypass security checks. The vulnerability stems from early validation of package names before full URL parsing, enabling malicious actors to manipulate the package name by appending additional characters (e.g., `@evil/pkg` appended to legit-pkg). This bypass tricks the system into installing unintended npm packages, potentially leading to supply chain attacks. The flaw is exploitable remotely without authentication (CVSS:4.0 5.5 MEDIUM).
DailyCVE Form
Platform: npm
Version: <5.9.2
Vulnerability: URL validation bypass
Severity: Medium
Date: 2025-06-03
Prediction: Patch by 2025-07-15
What Undercode Say:
Exploitation
1. Malicious Package Injection:
Craft a malicious package.json with bypassed resolved URL
echo '{"resolved":"https://registry.npmjs.org/legit-pkg@evil-pkg/-/evil-pkg-1.0.0.tgz"}' > payload.json
2. Exploit via Lockfile:
const lockfile = require('lockfile-lint-api');
lockfile.validate({ resolved: 'legit-pkg@evil-pkg' }); // Bypasses validation
Protection
1. Update:
npm install [email protected] --save-exact
2. Pre-validation Sanitization:
function sanitizeResolved(url) {
return url.split('@')[bash]; // Enforce strict package name extraction
}
3. CI/CD Mitigation:
GitHub Actions step to enforce version check - name: Verify lockfile-lint-api run: npm list lockfile-lint-api | grep -q "5.9.2"
4. Network Restriction:
Use firewall rules to restrict npm registry access iptables -A OUTPUT -p tcp --dport 443 -d registry.npmjs.org -j ACCEPT iptables -A OUTPUT -p tcp --dport 443 -j DROP
5. Logging Suspicious Activity:
const fs = require('fs');
fs.watchFile('package-lock.json', (curr, prev) => {
if (curr.mtime !== prev.mtime) console.log('Lockfile modified!');
});
6. Signature Verification:
npm install --ignore-scripts --package-lock-only --audit
7. Dependency Whitelisting:
{
"dependencies": {
"lockfile-lint-api": ">=5.9.2"
}
}
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
