CVE-2024-21647
Prior to version 6.4.2, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies in a way that allowed HTTP request smuggling.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.96%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.96% probability · 60th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- puma/puma
- Source
- security-advisories@github.com
References
- https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93Patch
- https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2Vendor Advisory
- https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93Patch
- https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.