USN-4882-1: Ruby vulnerabilities

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

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)

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

• libruby2.7 - 2.7.0-5ubuntu1.3
• ruby2.7 - 2.7.0-5ubuntu1.3

Ubuntu 18.04

• libruby2.5 - 2.5.1-1ubuntu1.8
• ruby2.5 - 2.5.1-1ubuntu1.8

Ubuntu 16.04

• 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.

References

• CVE-2020-10663
• CVE-2020-10933
• CVE-2020-25613