USN-3553-1: Ruby vulnerabilities

Releases

• Ubuntu 17.10
• Ubuntu 16.04 ESM

Packages

• 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 versions:

Ubuntu 17.10

• libruby2.3 - 2.3.3-1ubuntu1.3
• ruby2.3 - 2.3.3-1ubuntu1.3

Ubuntu 16.04

• libruby2.3 - 2.3.1-2~16.04.6
• ruby2.3 - 2.3.1-2~16.04.6

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

References

• CVE-2017-0901
• CVE-2017-0902
• CVE-2017-0903

Related notices

• USN-3439-1: ri1.9.1, ruby1.9.1-full, ruby1.9.1-dev, ruby1.9.3, libruby1.9.1, ruby1.9.1, ruby1.9.1-examples, libtcltk-ruby1.9.1
• USN-3685-1: ri1.9.1, ruby1.9.1-full, ruby1.9.1-dev, ruby1.9.3, libruby2.3, ruby2.3-tcltk, ruby2.0-dev, ruby2.0-tcltk, ruby2.3, ruby2.3-doc, libruby2.0, ruby2.3-dev, libruby1.9.1, ruby2.0, ruby1.9.1, ruby2.0-doc, ruby1.9.1-examples, libtcltk-ruby1.9.1
• USN-3685-2: ruby2.0-dev, libruby2.0, ruby2.0, ruby2.0-doc, ruby2.0-tcltk