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Arbitrary Code Injection The advisory has been revoked - it doesn't affect any version of package puma  (opens in a new tab)

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EPSS
2.55% (84th percentile)

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  • Snyk IDSNYK-UBUNTU2004-PUMA-610892
  • published10 Sept 2020
  • disclosed28 Feb 2020
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Introduced: 28 Feb 2020

CVE-2020-5247  (opens in a new tab)
CWE-74  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:20.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream puma package and not the puma package as distributed by Ubuntu.

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