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How the CVE Works
The vulnerability (CVE-2025-XXXX) in Redoc <= 2.2.0 stems from insecure object merging in the `Module.mergeObjects` function (redoc/bundles/redoc.lib.js:2). Attackers can exploit prototype pollution by injecting a malicious payload containing specially crafted `__proto__` properties. When merged, these properties modify the base Object.prototype, leading to Denial of Service (DoS) or potential remote code execution. The flaw occurs due to improper input sanitization in the object deep-merge logic, allowing attackers to pollute global prototypes and disrupt application behavior.
DailyCVE Form
Platform: Redoc
Version: <= 2.0.0
Vulnerability: Prototype Pollution
Severity: High
Date: Mar 28, 2025
What Undercode Say:
Exploitation:
1. Craft Payload:
{"<strong>proto</strong>":{"polluted":"true"}}
2. Send Payload:
curl -X POST -H "Content-Type: application/json" --data '{"<strong>proto</strong>":{"isAdmin":true}}' http://redoc-server/
3. Verify Pollution:
console.log({}.isAdmin); // Returns 'true' if exploited
Protection:
1. Update Redoc:
npm update redoc@latest
2. Sanitize Inputs:
const mergeSafe = (target, source) => {
if (source.<strong>proto</strong> === Object.prototype) throw "Blocked!";
return Object.assign(target, source);
};
3. Freeze Prototypes:
Object.freeze(Object.prototype);
Detection:
1. Scan Dependencies:
npm audit
2. Static Analysis:
grep -r "mergeObjects" ./node_modules/redoc/
Mitigation Commands:
1. Patch Workaround:
delete Object.prototype.polluted;
2. Log Monitoring:
tail -f /var/log/redoc.log | grep "proto"
References:
References:
Reported By: https://github.com/advisories/GHSA-9rhg-254w-fh9x
Extra Source Hub:
Undercode
