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AUSCERT Security Bulletin
ASB-2012.0032.2
Two vulnerabilities corrected in Ruby on Rails
14 March 2012
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AusCERT Security Bulletin Summary
---------------------------------
Product: Ruby on Rails
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2012-1098 CVE-2012-1099
Member content until: Wednesday, April 4 2012
Revision History: March 14 2012: Added CVE's
March 5 2012: Initial Release
OVERVIEW
Two vulnerabilities have been identified in Ruby on Rails prior to
versions 3.2.2, 3.1.4, 3.0.12 [1,2]
IMPACT
The vendor has provided the following description of the
vulnerabilities:
"Due side effects of some optimizations in the String class, users
that directly manipulate SafeBuffer objects via `[]` and other
methods that return new instances of SafeBuffer may be inadvertently
marked as HTML safe." [1]
"When developers generate html options tags manually, user input
concatenated with manually built tags may not be escaped and an
attacker can inject arbitrary HTML in to the document. Only manually
generated select tag options are impacted" [2]
MITIGATION
Ruby on Rails versions 3.2.2, 3.1.4 and 3.0.12 have been released
correcting these vulnerabilities. [3]
REFERENCES
[1] Possible XSS Security Vulnerability in SafeBuffer#[] Options
http://groups.google.com/group/rubyonrails-security/browse_thread/thread/edd28f1e3d04e913?pli=1
[2] XSS Vulnerability in the select helper
http://groups.google.com/group/rubyonrails-security/browse_thread/thread/9da0c515a6c4664?pli=1
[3] [ANN] Rails 3.2.2 has been released!
http://weblog.rubyonrails.org/2012/3/1/ann-rails-3-2-2-has-been-released
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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