Rapid7 Vulnerability & Exploit Database

Gentoo Linux: CVE-2021-41136: Puma: Multiple Vulnerabilities

Back to Search

Gentoo Linux: CVE-2021-41136: Puma: Multiple Vulnerabilities

Severity
4
CVSS
(AV:N/AC:H/Au:S/C:P/I:P/A:N)
Published
10/12/2021
Created
08/29/2022
Added
08/16/2022
Modified
08/16/2022

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`.

Solution(s)

  • gentoo-linux-upgrade-www-servers-puma

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;