Ubuntu 20.10 LTS: USN-4882-1 Critical: Ruby Code Execution Issue

ubuntu

March 18, 2021

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 the Ruby JSON gem incorrectly handled certain JSON

files. If a user or automated system were tricked into parsing a specially

crafted JSON file, a remote attacker could use this issue to execute

arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04

LTS. (CVE-2020-10663)

It was discovered that Ruby incorrectly handled certain socket memory

operations. A remote attacker could possibly use this issue to obtain

sensitive information. This issue only affected Ubuntu 18.04 LTS and

Ubuntu 20.04 LTS. (CVE-2020-10933)

It was discovered that Ruby incorrectly handled certain transfer-encoding

headers when using Webrick. A remote attacker could possibly use this issue

to bypass a reverse proxy. (CVE-2020-25613)

Topics Covered

security advisory code execution remote access Ubuntu Ruby

Update Instructions

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

Ubuntu 20.10:
  libruby2.7                      2.7.1-3ubuntu1.2
  ruby2.7                         2.7.1-3ubuntu1.2

Ubuntu 20.04 LTS:
  libruby2.7                      2.7.0-5ubuntu1.3
  ruby2.7                         2.7.0-5ubuntu1.3

Ubuntu 18.04 LTS:
  libruby2.5                      2.5.1-1ubuntu1.8
  ruby2.5                         2.5.1-1ubuntu1.8

Ubuntu 16.04 LTS:
  libruby2.3                      2.3.1-2~ubuntu16.04.15
  ruby2.3                         2.3.1-2~ubuntu16.04.15

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