CVE-2021-41136 (Low) detected in puma-4.3.5.gem - autoclosed

[mend-for-github-com[bot]]

CVE-2021-41136 - Low Severity Vulnerability

Vulnerable Library - puma-4.3.5.gem

Puma is a simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications. Puma is intended for use in both development and production environments. It's great for highly concurrent Ruby implementations such as Rubinius and JRuby as well as as providing process worker support to support CRuby well.

Library home page: https://rubygems.org/gems/puma-4.3.5.gem

Dependency Hierarchy: - :x: **puma-4.3.5.gem** (Vulnerable Library)

Found in HEAD commit: ef980180214dbeaba07dbfcc87752fa216d3a34f

Found in base branch: master

Vulnerability Details

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`.

Publish Date: 2021-10-12

URL: CVE-2021-41136

CVSS 3 Score Details (3.7)

Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: High - Privileges Required: Low - User Interaction: Required - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: Low - Integrity Impact: Low - Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://github.com/puma/puma/security/advisories/GHSA-48w2-rm65-62xx

Release Date: 2021-10-12

Fix Resolution: puma - 4.3.9, 5.5.1

[mend-for-github-com[bot]]

:heavy_check_mark: This issue was automatically closed by Mend because the vulnerable library in the specific branch(es) was either marked as ignored or it is no longer part of the Mend inventory.