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AUSCERT Security Bulletin
ASB-2013.0082
Multiple vulnerabilities have been identified in Ruby.
28 June 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: Ruby
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote with User Interaction
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-4073 CVE-2013-1821
Member content until: Sunday, July 28 2013
OVERVIEW
Vulnerabilities have been identified in Ruby versions prior to
2.0.0-p247, 1.9.3-p448, Ruby 1.8.7-p374. [1, 2, 3]
IMPACT
The following information concerning these vulnerabilities is from the
vendor's website:
"A vulnerability in Ruby's SSL client that could allow
man-in-the-middle attackers to spoof SSL servers via valid
certificate issued by a trusted certification authority.
This vulnerability has been assigned the CVE identifier
CVE-2013-4073." [4]
"Unrestricted entity expansion can lead to a DoS vulnerability in
REXML.
This vulnerability has been assigned the CVE identifier CVE-2013-1821."
[5]
MITIGATION
All users should upgrade to the latest versions. [1, 2, 3]
REFERENCES
[1] Ruby 2.0.0-p247 is released
http://www.ruby-lang.org/en/news/2013/06/27/ruby-2-0-0-p247-is-released/
[2] Ruby 1.9.3-p448 is released
http://www.ruby-lang.org/en/news/2013/06/27/ruby-1-9-3-p448-is-released/
[3] Ruby 1.8.7-p374 is released
http://www.ruby-lang.org/en/news/2013/06/27/ruby-1-8-7-p374-is-released/
[4] Hostname check bypassing vulnerability in SSL client
(CVE-2013-4073)
http://www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/
[5] Entity expansion DoS vulnerability in REXML (XML bomb,
CVE-2013-1821)
http://www.ruby-lang.org/en/news/2013/02/22/rexml-dos-2013-02-22/
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.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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