Ubuntu 21.10 USN-5235-1 Moderate: Ruby Denial Of Service Risk

ubuntu

January 18, 2022

Several security issues were fixed in Ruby.

Summary

Several security issues were fixed in Ruby.

Software Description:

- ruby2.7: Object-oriented scripting language

- ruby2.5: Object-oriented scripting language

- ruby2.3: Object-oriented scripting language

Details:

It was discovered that Ruby incorrectly handled certain HTML files.

An attacker could possibly use this issue to cause a crash. This

issue only affected Ubuntu 20.04 LTS, Ubuntu 21.04, and Ubuntu 21.10.

(CVE-2021-41816)

It was discovered that Ruby incorrectly handled certain regular expressions.

An attacker could possibly use this issue to cause a regular expression

denial of service. (CVE-2021-41817)

It was discovered that Ruby incorrectly handled certain cookie names.

An attacker could possibly use this issue to access or expose

sensitive information. (CVE-2021-41819)

Topics Covered

security advisory denial of service software update security fix Ubuntu Ruby

Update Instructions

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

Ubuntu 21.10:
  ruby2.7                         2.7.4-1ubuntu3.1

Ubuntu 21.04:
  ruby2.7                         2.7.2-4ubuntu1.3

Ubuntu 20.04 LTS:
  ruby2.7                         2.7.0-5ubuntu1.6

Ubuntu 18.04 LTS:
  ruby2.5                         2.5.1-1ubuntu1.11

Ubuntu 16.04 ESM:
  ruby2.3                         2.3.1-2~ubuntu16.04.16+esm2

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