CVE-2023-49799
📋 TL;DR
This vulnerability in nuxt-api-party allows attackers to bypass URL validation by adding leading whitespace before absolute URLs, enabling Server-Side Request Forgery (SSRF). Attackers can force the server to make unauthorized requests to external systems, potentially leaking credentials or accessing internal resources. All users of vulnerable versions are affected.
💻 Affected Systems
- nuxt-api-party
📦 What is this software?
Nuxt Api Party by Johannschopplich
⚠️ Risk & Real-World Impact
Worst Case
Complete credential leakage from internal systems, access to cloud metadata services, or internal network reconnaissance leading to further compromise.
Likely Case
Unauthorized data exfiltration from internal APIs, access to internal services, or credential harvesting from vulnerable endpoints.
If Mitigated
Limited impact if proper network segmentation and egress filtering are in place, though SSRF vectors remain dangerous.
🎯 Exploit Status
Exploitation requires the ability to control URL parameters passed to nuxt-api-party endpoints. The bypass technique is simple and well-documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.22.1
Vendor Advisory: https://github.com/johannschopplich/nuxt-api-party/security/advisories/GHSA-3wfp-253j-5jxv
Restart Required: Yes
Instructions:
1. Update package.json to use nuxt-api-party version 0.22.1 or higher. 2. Run npm update nuxt-api-party or yarn upgrade nuxt-api-party. 3. Restart the Nuxt application server.
🔧 Temporary Workarounds
Revert to previous URL validation
allManually revert to the previous absolute URL detection method before the vulnerable regex change
Check commit history and manually apply previous validation logic
🧯 If You Can't Patch
- Implement strict input validation that trims whitespace before URL validation
- Deploy network egress filtering to restrict outbound connections from the application server
🔍 How to Verify
Check if Vulnerable:
Check package.json for nuxt-api-party version. If version is below 0.22.1, the system is vulnerable.Check Version:
npm list nuxt-api-party or check package.jsonVerify Fix Applied:
After updating, verify the version is 0.22.1 or higher and test that URLs with leading whitespace are properly rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from the application server
- Requests to unexpected domains or internal IP ranges
Network Indicators:
- HTTP requests with leading whitespace in URLs
- Outbound connections to non-whitelisted domains from the app server
SIEM Query:
source="application_logs" AND (url CONTAINS "\nhttp" OR url CONTAINS "\rhttp" OR url CONTAINS " http")🔗 References
- https://fetch.spec.whatwg.org/
- https://fetch.spec.whatwg.org/#http-whitespace-byte
- https://github.com/johannschopplich/nuxt-api-party/blob/777462e1e3af1d9f8938aa33f230cd8cb6e0cc9a/src/runtime/server/handler.ts#L31
- https://github.com/johannschopplich/nuxt-api-party/security/advisories/GHSA-3wfp-253j-5jxv
- https://infra.spec.whatwg.org/#byte-sequence
- https://fetch.spec.whatwg.org/
- https://fetch.spec.whatwg.org/#http-whitespace-byte
- https://github.com/johannschopplich/nuxt-api-party/blob/777462e1e3af1d9f8938aa33f230cd8cb6e0cc9a/src/runtime/server/handler.ts#L31
- https://github.com/johannschopplich/nuxt-api-party/security/advisories/GHSA-3wfp-253j-5jxv
- https://infra.spec.whatwg.org/#byte-sequence
