Vulnerability identifier: #VU82971

Vulnerability risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-40175

CWE-ID: CWE-444

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Puma
Server applications / Web servers

Vendor: Evan Phoenix

Description

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

The vulnerability exists due to improper validation of HTTP requests when parsing chunked transfer encoding bodies and zero-length Content-Length headers. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Puma: 6.3.0, 6.2.0 - 6.2.2, 6.1.0 - 6.1.1, 6.0.0 - 6.0.2, 5.6.0 - 5.6.6, 5.5.0 - 5.5.2, 5.4.0, 5.3.0 - 5.3.2, 5.2.0 - 5.2.2, 5.1.0 - 5.1.1, 5.0.0 - 5.0.4

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External links
http://github.com/puma/puma/commit/690155e7d644b80eeef0a6094f9826ee41f1080a
http://github.com/puma/puma/security/advisories/GHSA-68xg-gqqm-vgj8

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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.