CVE-2021-41136
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
12/10/2021
Last modified:
27/05/2025
Description
Puma is a HTTP 1.1 server for Ruby/Rack applications. Prior to versions 5.5.1 and 4.3.9, using `puma` with a proxy which forwards HTTP header values which contain the LF character could allow HTTP request smugggling. A client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. The only proxy which has this behavior, as far as the Puma team is aware of, is Apache Traffic Server. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client. This vulnerability was patched in Puma 5.5.1 and 4.3.9. As a workaround, do not use Apache Traffic Server with `puma`.
Impact
Base Score 3.x
3.70
Severity 3.x
LOW
Base Score 2.0
3.60
Severity 2.0
LOW
Vulnerable products and versions
CPE | From | Up to |
---|---|---|
cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:* | 4.3.8 (including) | |
cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:* | 5.0.0 (including) | 5.5.0 (including) |
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | ||
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
To consult the complete list of CPE names with products and versions, see this page
References to Advisories, Solutions, and Tools
- https://github.com/puma/puma/commit/436c71807f00e07070902a03f79fd3e130eb6b18
- https://github.com/puma/puma/commit/acdc3ae571dfae0e045cf09a295280127db65c7f
- https://github.com/puma/puma/commit/fb6ad8f8013ab5cdbb2f444cbfabd0b4fde71139
- https://github.com/puma/puma/security/advisories/GHSA-48w2-rm65-62xx
- https://github.com/puma/puma/commit/acdc3ae571dfae0e045cf09a295280127db65c7f
- https://github.com/puma/puma/security/advisories/GHSA-48w2-rm65-62xx
- https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html
- https://security.gentoo.org/glsa/202208-28
- https://www.debian.org/security/2022/dsa-5146