Listen to this Post
How the Mentioned CVE Works:
The vulnerability exists in the `/api/storage/upload` endpoint of PubNet, a self-hosted package repository for Dart and Flutter. The endpoint does not require authentication or proper authorization checks. An attacker can send a direct HTTP POST request to this endpoint. Within the request, the `author-id` parameter can be manipulated to contain any arbitrary user identifier. The server blindly accepts this user-provided value without verifying if the requestor has the right to impersonate that user. This allows an unauthenticated remote attacker to upload malicious package archives that appear to be authored by any legitimate user of the system. By spoofing a trusted maintainer’s identity, the attacker can publish trojanized packages into the repository, leading to privilege escalation within PubNet and potential supply chain attacks against developers who trust and install the compromised packages.
DailyCVE form:
Platform: PubNet
Version: < 1.1.3
Vulnerability: Unauthenticated Upload
Severity: Critical
date: 2025-11-28
Prediction: Patched 2025-11-28
What Undercode Say:
curl -X POST http://[bash]/api/storage/upload \
-F "author-id=ATTACKER_INJECTED_ID" \
-F "package=@malicious_package.tar.gz"
Example server-side validation patch snippet (conceptual):
Future<Response> uploadPackage(Request request) async {
final userId = _validateSession(request); // Added authentication check
final authorId = request.body['author-id'];
if (userId != authorId) { throw AuthorizationException(); } // Added authorization check
// ... proceed with upload
}
How Exploit:
1. Craft malicious Dart package.
- Send unauthenticated POST to `/api/storage/upload` with spoofed
author-id.
3. System stores package under victim’s identity.
- Users install the compromised package, executing attacker code.
Protection from this CVE:
Upgrade to PubNet >=1.1.3.
Implement endpoint authentication.
Validate `author-id` against session.
Impact:
Identity Spoofing
Privilege Escalation
Supply Chain Compromise
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
