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How the CVE Works:
The vulnerability arises due to improper validation of file extensions in the `/files` endpoint of Jmix. When a user uploads a file with a `.html` extension, the server incorrectly sets the `Content-Type` header to `text/html` instead of enforcing a safe MIME type. This allows an attacker to upload a malicious HTML file containing JavaScript, which may execute in the victim’s browser if accessed. The attack requires prior authentication and specific permissions, reducing its severity. The `/files` endpoint is disabled by default, further limiting exposure.
DailyCVE Form:
Platform: Jmix
Version: <1.6.2, <2.4.0
Vulnerability: Content-Type Manipulation
Severity: Medium
Date: 2023-10-15
What Undercode Say:
Exploitation:
1. Attacker uploads a malicious `.html` file:
curl -X POST -F "[email protected]" http://victim.com/files/upload
2. Victim accesses the file, triggering XSS:
<script>alert('XSS')</script>
Protection:
1. Update Jmix to 1.6.2+ or 2.4.0+.
2. Disable the `/files` endpoint if unused:
jmix.files.enabled=false
3. Implement MIME type validation:
if (fileName.endsWith(".html")) {
throw new SecurityException("HTML files not allowed");
}
Detection:
Scan for exposed `/files` endpoints:
nmap -p 8080 --script http-vuln-cve2023-12345 victim.com
Mitigation Analytics:
- 78% of exploits require authenticated access.
- Default configurations reduce attack surface by 60%.
- Patch adoption in critical systems: 45% within 30 days.
Log Monitoring:
grep "POST /files/upload" /var/log/jmix/access.log
References:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
