Bug 2275280 (CVE-2024-1135) - CVE-2024-1135 python-gunicorn: HTTP Request Smuggling due to improper validation of Transfer-Encoding headers
Summary: CVE-2024-1135 python-gunicorn: HTTP Request Smuggling due to improper validat...
Keywords:
Status: NEW
Alias: CVE-2024-1135
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
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Whiteboard:
Depends On: 2275348 2275349 2275350 2275351 2275352 2275353 2275354 2275355 2275356 2277405 2277406 2277407 2277408 2275357 2275358
Blocks: 2275366
TreeView+ depends on / blocked
 
Reported: 2024-04-16 12:32 UTC by Mauro Matteo Cascella
Modified: 2024-04-26 20:11 UTC (History)
59 users (show)

Fixed In Version: gunicorn 22.0.0
Doc Type: ---
Doc Text:
An HTTP Request Smuggling vulnerability was found in Gunicorn. 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.
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Description Mauro Matteo Cascella 2024-04-16 12:32:26 UTC 
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.

Huntr security advisory:
https://huntr.com/bounties/22158e34-cfd5-41ad-97e0-a780773d96c1
Comment 1 Mauro Matteo Cascella 2024-04-16 12:37:23 UTC 
Upstream fix:
https://github.com/benoitc/gunicorn/commit/ac29c9b0a758d21f1e0fb3b3457239e523fa9f1d
Comment 2 Mauro Matteo Cascella 2024-04-16 20:37:55 UTC 
Created graphite-web tracking bugs for this issue:

Affects: epel-all [bug 2275349]


Created python-gunicorn tracking bugs for this issue:

Affects: epel-all [bug 2275350]
Affects: fedora-all [bug 2275348]


Created python3-gunicorn tracking bugs for this issue:

Affects: epel-all [bug 2275351]
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