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AA-2007.0112                  AUSCERT Advisory

                             [Win][UNIX/Linux]
              Session fixation vulnerability in Ruby on Rails
                             26 November 2007
- ---------------------------------------------------------------------------

        AusCERT Advisory Summary
        ------------------------

Product:              Ruby on Rails
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Inappropriate Access
                      Provide Misleading Information
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-6077 CVE-2007-5380
Member content until: Monday, December 24 2007

Ref:                  ESB-2007.0935

OVERVIEW:

       Due to an incomplete fix for CVE-2007-5380, CVE-2007-6077 has been
       assigned to detail a session fixation vulnerability in Ruby on 
       Rails prior to 1.2.6.


IMPACT:

       The National Vulnerability Database [1], gives the following
       information regarding this vulnerability:

       o CVE-2007-6077: "The session fixation protection mechanism in 
         cgi_process.rb in Rails 1.2.4, as used in Ruby on Rails, removes 
         the :cookie_only attribute from the DEFAULT_SESSION_OPTIONS 
         constant, which effectively causes :cookie_only to only be applied 
         to the first instantiation of CgiRequest, which allows remote 
         attackers to conduct session fixation attacks." [2]


MITIGATION:

       Ruby on Rails 1.2.6 has been released to resolve this vulnerability
       [3] and is available for download from the vendors website. [4]


REFERENCES:

       [1] National Vulnerability Database
           http://nvd.nist.gov/

       [2] National Vulnerability Database CVE-2007-6077
           http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-6077

       [3] Riding Rails
           http://weblog.rubyonrails.org/

       [4] RubyForge: Rails: Project Filelist
           http://rubyforge.org/frs/?group_id=307


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.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
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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