USN-4922-1: Ruby vulnerability

Releases

• Ubuntu 20.10
• 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

Juho Nurminen discovered that the REXML gem bundled with Ruby incorrectly
parsed and serialized XML documents. A remote attacker could possibly use
this issue to perform an XML round-trip attack.

Update instructions

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

Ubuntu 20.10

• libruby2.7 - 2.7.1-3ubuntu1.3
• ruby2.7 - 2.7.1-3ubuntu1.3

Ubuntu 20.04

• libruby2.7 - 2.7.0-5ubuntu1.4
• ruby2.7 - 2.7.0-5ubuntu1.4

Ubuntu 18.04

• libruby2.5 - 2.5.1-1ubuntu1.9
• ruby2.5 - 2.5.1-1ubuntu1.9

Ubuntu 16.04

• libruby2.3 - 2.3.1-2~ubuntu16.04.16
• ruby2.3 - 2.3.1-2~ubuntu16.04.16

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

References

• CVE-2021-28965

Related notices

• USN-4922-2: ruby2.7-dev, libruby2.7, ruby2.7, ruby2.7-doc