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AUSCERT Security Bulletin
Multiple vulnerabilities in RubyGems
31 August 2017
AusCERT Security Bulletin Summary
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Overwrite Arbitrary Files -- Remote with User Interaction
Denial of Service -- Existing Account
Provide Misleading Information -- Remote with User Interaction
CVE Names: CVE-2017-0902 CVE-2017-0901 CVE-2017-0900
Member content until: Saturday, September 30 2017
Multiple vulnerabilities have been identified in Ruby prior to
versions 2.28, 2.3.5, 2.4.2 and Trunk revision 59673 
The vendor has provided the following details regarding the issues:
"a DNS request hijacking vulnerability. (CVE-2017-0902)
an ANSI escape sequence vulnerability. (CVE-2017-0899)
a DoS vulnerability in the query command. (CVE-2017-0900)
a vulnerability in the gem installer that allowed a malicious gem to
overwrite arbitrary files. (CVE-2017-0901)
It is strongly recommended for Ruby users to take one of the
following workarounds as soon as possible.
Ruby 2.2 series: 2.2.7 and earlier
Ruby 2.3 series: 2.3.4 and earlier
Ruby 2.4 series: 2.4.1 and earlier
prior to trunk revision 59672" 
"At this moment, there are no Ruby releases including the fix for
RubyGems. But you can upgrade RubyGems to the latest version.
RubyGems 2.6.13 or later includes the fix for the vulnerabilities."
 Multiple vulnerabilities in RubyGems
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
Australian Computer Emergency Response Team
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