==========================================================================
Ubuntu Security Notice USN-3553-1
January 31, 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 versions:
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
In general, a standard system update will make all the necessary
changes.
References:
https://www.ubuntu.com/usn/usn-3553-1
CVE-2017-0901, CVE-2017-0902, CVE-2017-0903
Package Information:
https://launchpad.net/ubuntu/+source/ruby2.3/2.3.3-1ubuntu1.3
https://launchpad.net/ubuntu/+source/ruby2.3/2.3.1-2~16.04.6
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