USN-5235-1: Ruby vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• ruby2.3 - Object-oriented scripting language
• ruby2.5 - Object-oriented scripting language
• ruby2.7 - 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)

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

• ruby2.7 - 2.7.0-5ubuntu1.6

Ubuntu 18.04

• ruby2.5 - 2.5.1-1ubuntu1.11

Ubuntu 16.04

• ruby2.3 - 2.3.1-2~ubuntu16.04.16+esm2
  Available with Ubuntu Pro

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

References

• CVE-2021-41816
• CVE-2021-41819
• CVE-2021-41817