Ubuntu 19.10: USN-4201-1 Moderate: Ruby Denial of Service Issues

ubuntu

November 26, 2019

Several security issues were fixed in Ruby.

Summary

Several security issues were fixed in Ruby.

Software Description:

- ruby2.5: Interpreter of object-oriented scripting language Ruby

- ruby2.3: Object-oriented scripting language

Details:

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)

Topics Covered

security advisory denial of service unauthorized access code execution ubuntu ruby

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 19.10:
  libruby2.5                      2.5.5-4ubuntu2.1
  ruby2.5                         2.5.5-4ubuntu2.1

Ubuntu 19.04:
  libruby2.5                      2.5.5-1ubuntu1.1
  ruby2.5                         2.5.5-1ubuntu1.1

Ubuntu 18.04 LTS:
  libruby2.5                      2.5.1-1ubuntu1.6
  ruby2.5                         2.5.1-1ubuntu1.6

Ubuntu 16.04 LTS:
  libruby2.3                      2.3.1-2~ubuntu16.04.14
  ruby2.3                         2.3.1-2~ubuntu16.04.14

In general, a standard system update will make all the necessary changes.