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AUSCERT External Security Bulletin Redistribution
Moderate: ruby193-ruby security update
16 October 2013
AusCERT Security Bulletin Summary
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Red Hat Enterprise Linux WS/Desktop 6
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2013-4287
Comment: This advisory references vulnerabilities in products which run on
platforms other than Red Hat. It is recommended that administrators
running ruby193-ruby check for an updated version of the software
for their operating system.
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Red Hat Security Advisory
Synopsis: Moderate: ruby193-ruby security update
Advisory ID: RHSA-2013:1427-01
Product: Red Hat Software Collections
Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-1427.html
Issue date: 2013-10-15
CVE Names: CVE-2013-4287
Updated ruby193-ruby packages that fix one security issue are now available
for Red Hat Software Collections 1.
The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.
2. Relevant releases/architectures:
Red Hat Software Collections for RHEL 6 Server - noarch, x86_64
Red Hat Software Collections for RHEL 6 Workstation - noarch, x86_64
Ruby is an extensible, interpreted, object-oriented, scripting language. It
has features to process text files and to do system management
tasks. RubyGems is the Ruby standard for publishing and managing
It was discovered that the rubygems API validated version strings using an
unsafe regular expression. An application making use of this API to process
a version string from an untrusted source could be vulnerable to a denial
of service attack through CPU exhaustion. (CVE-2013-4287)
Red Hat would like to thank Rubygems upstream for reporting
CVE-2013-4287. Upstream acknowledges Damir Sharipov as the original
All ruby193-ruby users are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue.
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
5. Bugs fixed (http://bugzilla.redhat.com/):
1002364 - CVE-2013-4287 rubygems: version regex algorithmic complexity vulnerability
6. Package List:
Red Hat Software Collections for RHEL 6 Server:
Red Hat Software Collections for RHEL 6 Workstation:
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2013 Red Hat, Inc.
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