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Disable XML entity loader by default in libphutil

Authored by epriestley on Jan 23 2014, 9:32 PM.
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See and

By default, SimpleXMLElement will pretty much just run whatever code you want when handed a specially crafted document. We currently load XML only from trusted (S3, EC2, git/svn/hg) or local sources (unit test runners) so there are no concrete vulnerabilities in Phabricator, but this behavior is incredibly dangerous, surprising, and highly undesirable.

Test Plan

There's an example of a document which does bad things on I verified that SimpleXMLElement reads /etc/passwd when handed this document, then applied the fix. It no longer reads arbitrary files off disk.

Diff Detail

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