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Reviewed:  https://reviews.mahara.org/2102
Committed: http://gitorious.org/mahara/mahara/commit/f33d4cef66356d3fd96c54bde58bee983d6e61a1
Submitter: Aaron Wells (aaronw@xxxxxxxxxxxxxxx)
Branch:    master

commit f33d4cef66356d3fd96c54bde58bee983d6e61a1
Author: Aaron Wells <aaronw@xxxxxxxxxxxxxxx>
Date:   Wed May 1 14:16:23 2013 +1200

Documenting safe usage of simplexml_load_file()

Bug1047111

Change-Id: I850603dbc1d85f4360ce227d2658e5abb51af1aa

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https://bugs.launchpad.net/bugs/1047111

Title:
  XEE possible in mahara

Status in Mahara ePortfolio:
  Fix Released
Status in Mahara 1.4 series:
  Fix Released
Status in Mahara 1.5 series:
  Fix Released

Bug description:
  There is a security issue with the default XML parser for PHP, where ENTITY fields are
  loaded and substituted in text parts. 

  This allows possible attackers to read from internal networks, or files readable by the
  web server user.

  This includes reading of the config.php file, which contains sensitive information such
  as the database password, and the password salt field.

  The fix for this was to include a call to libxml_disable_entity_loader(true) during the
  initialization of a page.

  More information can be found at the following:
   http://projects.webappsec.org/w/page/13247003/XML%20External%20Entities
   http://websec.io/2012/08/27/Preventing-XEE-in-PHP.html

  Reported by Mike Haworth.

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