CVE-2024-21647

Summary

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.

Affected Software

Weaknesses

• CWE-444: CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2
• https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93
• https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2
• https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93

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