#VU107611 Inconsistent interpretation of HTTP requests in Gunicorn - CVE-2024-6827

Vulnerability identifier: #VU107611

Vulnerability risk: High

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2024-6827

CWE-ID: CWE-444

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Gunicorn
Server applications / File servers (FTP/HTTP)

Vendor: Gunicorn

Description

The vulnerability allows a remote attacker to perform HTTP request smuggling attacks.

The vulnerability exists due to Gunicorn does not properly validate the value of the 'Transfer-Encoding' header as specified in the RFC standards, which leads to the default fallback method of 'Content-Length,' making it vulnerable to TE.CL request smuggling. A remote attacker can send a specially crafted HTTP request to the server and initiate cache poisoning, data exposure, session manipulation, SSRF, XSS, DoS, data integrity compromise, security bypass, information leakage, and business logic abuse.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Gunicorn: 21.2.0

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External links
https://huntr.com/bounties/1b4f8f38-39da-44b6-9f98-f618639d0dd7

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.