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gunicorn@21.2.0 vulnerabilities

WSGI HTTP Server for UNIX

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Direct Vulnerabilities

Known vulnerabilities in the gunicorn package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • H
HTTP Request Smuggling

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:

  1. This is only exploitable if users have a network path which does not filter out invalid requests;

  2. Users are advised to block access to restricted endpoints via a firewall or other mechanism until a fix can be developed.

  3. 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.

How to fix HTTP Request Smuggling?

Upgrade gunicorn to version 22.0.0 or higher.

[,22.0.0)
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