Advisory Published

USN-4201-1: Ruby vulnerabilities

First published: Tue Nov 26 2019(Updated: )

It was discovered that Ruby incorrectly handled certain files. An attacker could possibly use this issue to pass path matching what can lead to an unauthorized access. (CVE-2019-15845) It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could use this issue to cause a denial of service. (CVE-2019-16201) It was discovered that Ruby incorrectly handled certain HTTP headers. An attacker could possibly use this issue to execute arbitrary code. (CVE-2019-16254) It was discovered that Ruby incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code. (CVE-2019-16255)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libruby2.5<2.5.5-4ubuntu2.1
2.5.5-4ubuntu2.1
=19.10
All of
ubuntu/ruby2.5<2.5.5-4ubuntu2.1
2.5.5-4ubuntu2.1
=19.10
All of
ubuntu/libruby2.5<2.5.5-1ubuntu1.1
2.5.5-1ubuntu1.1
=19.04
All of
ubuntu/ruby2.5<2.5.5-1ubuntu1.1
2.5.5-1ubuntu1.1
=19.04
All of
ubuntu/libruby2.5<2.5.1-1ubuntu1.6
2.5.1-1ubuntu1.6
=18.04
All of
ubuntu/ruby2.5<2.5.1-1ubuntu1.6
2.5.1-1ubuntu1.6
=18.04
All of
ubuntu/libruby2.3<2.3.1-2~ubuntu16.04.14
2.3.1-2~ubuntu16.04.14
=16.04
All of
ubuntu/ruby2.3<2.3.1-2~ubuntu16.04.14
2.3.1-2~ubuntu16.04.14
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID of this advisory?

    The vulnerability ID of this advisory is USN-4201-1.

  • What is the severity of USN-4201-1?

    The severity of USN-4201-1 is not specified in the provided information.

  • How does this vulnerability impact Ruby?

    This vulnerability in Ruby can allow an attacker to pass path matching leading to unauthorized access.

  • What versions of Ruby are affected by this vulnerability?

    Ruby versions 2.5.5, 2.5.1, and 2.3.1, along with specific Ubuntu packages, are affected by this vulnerability.

  • How can I fix this vulnerability?

    To fix this vulnerability, update to the specific remedial versions of the affected Ruby packages (libruby2.5, ruby2.5, libruby2.3, ruby2.3) provided in the Ubuntu Security Notice.

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