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AUSCERT External Security Bulletin Redistribution
ESB-2018.0314
Ruby vulnerabilities
1 February 2018
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AusCERT Security Bulletin Summary
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Product: Ruby
Publisher: Ubuntu
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
Resolution: Patch/Upgrade
CVE Names: CVE-2017-0903 CVE-2017-0902 CVE-2017-0901
Reference: ASB-2017.0137
ESB-2017.2520
ESB-2017.2224
Original Bulletin:
http://www.ubuntu.com/usn/usn-3553-1
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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
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