Exploit/Advisories

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Ubuntu Security Notice USN-5462-1
June 06, 2022

ruby2.5, ruby2.7, ruby3.0 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Ruby.

Software Description:
- ruby3.0: Interpreter of object-oriented scripting language Ruby
- ruby2.7: Object-oriented scripting language
- ruby2.5: Object-oriented scripting language

Details:

It was discovered that Ruby incorrectly handled certain regular expressions.
An attacker could possibly use this issue to execute arbitrary code. This
issue only affected Ubuntu 22.04 LTS. (CVE-2022-28738)

It was discovered that Ruby incorrectly handled certain inputs.
An attacker could possibly use this issue to expose sensitive information.
(CVE-2022-28739)

Update instructions:

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

Ubuntu 22.04 LTS:
libruby3.0 3.0.2-7ubuntu2.1
ruby3.0 3.0.2-7ubuntu2.1

Ubuntu 21.10:
libruby2.7 2.7.4-1ubuntu3.2
ruby2.7 2.7.4-1ubuntu3.2

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

Ubuntu 18.04 LTS:
libruby2.5 2.5.1-1ubuntu1.12
ruby2.5 2.5.1-1ubuntu1.12

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

References:
https://ubuntu.com/security/notices/USN-5462-1
CVE-2022-28738, CVE-2022-28739

Package Information:
https://launchpad.net/ubuntu/+source/ruby3.0/3.0.2-7ubuntu2.1
https://launchpad.net/ubuntu/+source/ruby2.7/2.7.4-1ubuntu3.2
https://launchpad.net/ubuntu/+source/ruby2.7/2.7.0-5ubuntu1.7
https://launchpad.net/ubuntu/+source/ruby2.5/2.5.1-1ubuntu1.12

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