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HTTP Response Splitting The advisory has been revoked - it doesn't affect any version of package rubygem-puma-debugsource  (opens in a new tab)

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EPSS
2.55% (84th percentile)

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  • Snyk IDSNYK-RHEL8-RUBYGEMPUMADEBUGSOURCE-4415131
  • published26 Mar 2023
  • disclosed2 Mar 2020
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Introduced: 2 Mar 2020

CVE-2020-5247  (opens in a new tab)
CWE-113  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:8.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rubygem-puma-debugsource package and not the rubygem-puma-debugsource package as distributed by RHEL.

In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. CR, LF or/r, /n) to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2019-16254, which fixed this vulnerability for the WEBrick Ruby web server. This has been fixed in versions 4.3.2 and 3.12.3 by checking all headers for line endings and rejecting headers with those characters.

References