CVE-2024-1135
Gunicorn fails to properly validate Transfer-Encoding headers, leading to HTTP Request Smuggling (HRS) vulnerabilities.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.00%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 3.00% probability · 87th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Source
- security@huntr.dev
References
- https://huntr.com/bounties/22158e34-cfd5-41ad-97e0-a780773d96c1
- https://lists.debian.org/debian-lts-announce/2024/06/msg00027.html
- https://huntr.com/bounties/22158e34-cfd5-41ad-97e0-a780773d96c1
- https://lists.debian.org/debian-lts-announce/2024/06/msg00027.html
- https://lists.debian.org/debian-lts-announce/2024/12/msg00018.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.