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AUSCERT External Security Bulletin Redistribution
1 February 2018
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Overwrite Arbitrary Files -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
CVE Names: CVE-2017-0903 CVE-2017-0902 CVE-2017-0901
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USN-3553-1: Ruby vulnerabilities
Ubuntu Security Notice USN-3553-1
31st January, 2018
A security issue affects these releases of Ubuntu and its derivatives:
Ubuntu 16.04 LTS
Several security issues were fixed in Ruby.
ruby2.3 - Interpreter of object-oriented scripting language Ruby
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)
The problem can be corrected by updating your system to the following package
Ubuntu 16.04 LTS:
To update your system, please follow these instructions:
In general, a standard system update will make all the necessary changes.
CVE-2017-0901, CVE-2017-0902, CVE-2017-0903
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