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2014-07-24 Instructure Advisory IAC01792 - Boundary issues with rubyzip gem

jordan
Community Champion
0 0 169

    SECURITY UPDATE

Canvas + Logo transparent (WHITE)- 300px.png

  Release Date:2014-07-24  (Last update can be found below the document title)
  Description:

Boundary issues with rubyzip gem

  Criticality Level:Moderately Critical ( Less Critical < Critical < Moderately Critical < Highly Critical )
  Impact:
  • Possible unauthorized access to filesystem and files
  • Possible escalation of privileges
  • Possible execution of arbitrary code
  Systems Affected:Canvas LMS
  Solution Status:Patched
  Discovered By:Internal audit
  Relevant Changesets:

https://github.com/instructure/canvas-lms/commit/a6e104a20b0e6da4251cf7ed90b4eecea0937130


Summary:

A vulnerability was discovered within the rubyzip gem used by Canvas which could allow an attacker to gain access to the filesystem, directories, files and/or execute arbitrary code via symbolic links.

Status:

Fixed in Canvas Cloud as of 7/24/2014. Users of Canvas CV are encouraged to either update to the most recent stable code or apply the patch manually.


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