Ubuntu 21.04: USN-5020-1 Critical: Ruby Code Execution Risks

ubuntu

July 21, 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 Ruby incorrectly handled certain inputs.

An attacker could possibly use this issue to execute arbitrary code.

(CVE-2021-31799)

It was discovered that Ruby incorrectly handled certain inputs.

An attacker could possibly use this issue to conduct

port scans and service banner extractions. This issue only affected

Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2021-31810)

It was discovered that Ruby incorrectly handled certain inputs.

An attacker could possibly use this issue to perform

man-in-the-middle attackers to bypass the TLS protection.

(CVE-2021-32066)

Topics Covered

security advisory code execution update instructions arbitrary code ubuntu ruby input handling

Update Instructions

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

Ubuntu 21.04:
  libruby2.7                      2.7.2-4ubuntu1.2
  ruby2.7                         2.7.2-4ubuntu1.2

Ubuntu 20.10:
  libruby2.7                      2.7.1-3ubuntu1.4
  ruby2.7                         2.7.1-3ubuntu1.4

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

Ubuntu 18.04 LTS:
  libruby2.5                      2.5.1-1ubuntu1.10
  ruby2.5                         2.5.1-1ubuntu1.10

Ubuntu 16.04 ESM:
  libruby2.3                      2.3.1-2~ubuntu16.04.16+esm1
  ruby2.3                         2.3.1-2~ubuntu16.04.16+esm1

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