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There are other ways for a string to enter the system, it could be
inferred from something that is user controlled, or it could come from
config files, for example.

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https://bugs.launchpad.net/bugs/1367022

Title:
  Un-sanitized eval may have security impact

Status in OpenStack Telemetry (Ceilometer):
  New
Status in OpenStack Security Advisories:
  Incomplete

Bug description:
  On this line:
  https://github.com/openstack/ceilometer/blob/master/ceilometer/transformer/conversions.py#L62
  eval is used for some transformation.  The comments near by suggest
  that it is used for a 'multiplicative factor or else a string to be
  eval'd'.

  If an attacker is able to provide an input like
  "__import__('os').system('rm -rf /etc')" the process will delete the
  etc directory with the privileges of the user that is running
  Ceilometer.

  Eval input should always be sanitized.  I was unable to find any
  places that this is actually used, but this should definitely be
  hardened.

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