Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsUpgrade gunicorn
to version 22.0.0 or higher.
gunicorn is a Python WSGI HTTP Server for UNIX
Affected versions of this package are vulnerable to HTTP Request Smuggling due to the improper validation of Transfer-Encoding
headers. An attacker can bypass security restrictions and access restricted endpoints by crafting requests with conflicting Transfer-Encoding
headers.
Notes:
This is only exploitable if users have a network path which does not filter out invalid requests;
Users are advised to block access to restricted endpoints via a firewall or other mechanism until a fix can be developed.
This issue arises from the application's incorrectly processing of requests with multiple, conflicting Transfer-Encoding
headers, treating them as chunked regardless of the final encoding specified.