Published: 08/01/2024 Updated: 11/01/2024

CVSS v3 Base Score: 7.5 | Impact Score: 3.6 | Exploitability Score: 3.9

VMScore: 0

Puma is a web server for Ruby/Rack applications built for parallelism. Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling. Fixed versions limits the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. This vulnerability has been fixed in versions 6.4.2 and 5.6.8.

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Debian Bug report logs - #1060345 puma: CVE-2024-21647: Invalid parsing of chunked encoding in HTTP/11 allows DoS attacks Package: src:puma; Maintainer for src:puma is Debian Ruby Team <pkg-ruby-extras-maintainers@listsaliothdebianorg>; Reported by: Salvatore Bonaccorso <carnil@debianorg> Date: Tue, 9 Jan 2024 2 ...

DescriptionA flaw was found in Puma rubygem Versions prior 642 are susceptible to a HTTP smuggling attack when parsing chunked transfer encoding bodies on HTTP messages, which don't limit the size of the message chunk extensions This issue may lead to uncontrolled resource consumption, possibly resulting in a denial of service of the att ...

CWE-444 https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2 https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1060345 https://nvd.nist.gov https://access.redhat.com/security/cve/cve-2024-21647

CVE-2024-21647

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