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HTTP Request Smuggling Affecting gunicorn package, versions [,22.0.0)

0.0
high

Snyk CVSS

    Attack Complexity Low
    Integrity High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.04% (9th percentile)
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Red Hat
7.5 high
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SUSE
7.4 high

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  • Snyk ID SNYK-PYTHON-GUNICORN-6615672
  • published 16 Apr 2024
  • disclosed 16 Apr 2024
  • credit Yadhu Krishna M
Report a new vulnerability Found a mistake?

Introduced: 16 Apr 2024

New CVE-2024-1135 Open this link in a new tab
CWE-444 Open this link in a new tab

How to fix?

Upgrade gunicorn to version 22.0.0 or higher.

Overview

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.

References