Arbitrary Code Injection Affecting ruby package, versions [,2.3.1)[2.4.0,2.4.8)[2.5.0,2.5.7)[2.6.0,2.6.5)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Not Defined
EPSS
1.03% (84th percentile)

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  • Snyk IDSNYK-UNMANAGED-RUBY-2370216
  • published26 Jan 2022
  • disclosed28 Feb 2020
  • creditUnknown

Introduced: 28 Feb 2020

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

How to fix?

Upgrade ruby to version 2.3.1, 2.4.8, 2.5.7, 2.6.5 or higher.

Overview

Affected versions of this package are vulnerable to Arbitrary Code Injection. 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.

CVSS Scores

version 3.1