How the CVE Works:
The vulnerability (CVE-2025-XXXX) in Quivr v0.0.298 arises from improper handling of multipart boundary strings in HTTP requests during file uploads. Attackers can exploit this by appending excessive characters to the boundary parameter in the `Content-Type` header of a multipart request. The server fails to validate or limit the size of the boundary string, causing it to enter an infinite loop while processing each character. This results in excessive CPU and memory consumption, leading to a Denial of Service (DoS) condition. The attack is unauthenticated, meaning no user credentials are required, making it highly exploitable.
DailyCVE Form:
Platform: Quivr
Version: v0.0.298
Vulnerability: Unauthenticated DoS
Severity: High
Date: Mar 20, 2025
What Undercode Say:
Exploitation:
1. Crafting Malicious Request:
Use tools like `curl` or Python’s `requests` library to send a multipart request with an oversized boundary string.
Example:
curl -X POST http://target.com/upload -H "Content-Type: multipart/form-data; boundary=-WebKitFormBoundary$(python3 -c 'print("A"10000)')" --data-binary @file.txt
2. Impact:
The server will consume 100% CPU and memory, rendering it unresponsive to legitimate requests.
3. Detection:
Monitor server logs for abnormally large boundary strings in `Content-Type` headers.
Protection:
1. Patch:
Update to the latest version of Quivr where the boundary string length is validated.
2. Input Validation:
Implement server-side validation to reject requests with boundary strings exceeding a reasonable length.
Example in Python:
from flask import request, abort
MAX_BOUNDARY_LENGTH = 100
boundary = request.headers.get('Content-Type', '').split('boundary=')[bash]
if len(boundary) > MAX_BOUNDARY_LENGTH:
abort(400, "Boundary string too long")
3. Rate Limiting:
Use tools like `nginx` or `fail2ban` to limit the number of requests from a single IP address.
Example `nginx` configuration:
http {
limit_req_zone $binary_remote_addr zone=upload_limit:10m rate=10r/s;
server {
location /upload {
limit_req zone=upload_limit burst=20;
}
}
}
4. Monitoring:
Set up alerts for abnormal CPU and memory usage using tools like Prometheus and Grafana.
5. WAF Rules:
Deploy a Web Application Firewall (WAF) to block requests with suspicious boundary strings.
6. Code Review:
Regularly review and test file upload handlers for similar vulnerabilities.
By following these steps, you can mitigate the risk of this vulnerability and protect your Quivr instance from exploitation.
References:
Reported By: https://github.com/advisories/GHSA-m76r-xqqj-mqmv
Extra Source Hub:
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