CVE-2024-1135

Gunicorn fails to properly validate Transfer-Encoding headers, leading to
HTTP Request Smuggling (HRS) vulnerabilities. By crafting requests with
conflicting Transfer-Encoding headers, attackers can bypass security
restrictions and access restricted endpoints. This issue is due to
Gunicorn’s handling of Transfer-Encoding headers, where it incorrectly
processes requests with multiple, conflicting Transfer-Encoding headers,
treating them as chunked regardless of the final encoding specified. This
vulnerability allows for a range of attacks including cache poisoning,
session manipulation, and data exposure.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1069126&gt;