USN-3553-1: Ruby vulnerabilities

Ubuntu Security Notice USN-3553-1

31st January, 2018

ruby2.3 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 17.10
• Ubuntu 16.04 LTS

Summary

Several security issues were fixed in Ruby.

Software description

• ruby2.3 - Interpreter of object-oriented scripting language Ruby

Details

It was discovered that Ruby failed to validate specification names.
An attacker could possibly use a maliciously crafted gem to potentially
overwrite any file on the filesystem. (CVE-2017-0901)

It was discovered that Ruby was vulnerable to a DNS hijacking vulnerability.
An attacker could use this to possibly force the RubyGems client to download
and install gems from a server that the attacker controls. (CVE-2017-0902)

It was discovered that Ruby incorrectly handled certain YAML files. An attacker could
use this to possibly execute arbitrary code. (CVE-2017-0903)

Update instructions

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

Ubuntu 17.10:

libruby2.3 2.3.3-1ubuntu1.3

ruby2.3 2.3.3-1ubuntu1.3

Ubuntu 16.04 LTS:

libruby2.3 2.3.1-2~16.04.6

ruby2.3 2.3.1-2~16.04.6

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2017-0901, CVE-2017-0902, CVE-2017-0903

from Ubuntu Security Notices http://ift.tt/2DPXl4y