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Compromise of Confidential or Sensitive Data

last modified 2008-02-25 17:23

There are essential procedures common to a data breach, although a data breach can occur in many ways. The data loss is discovered in the investigation of an incident that initially presents as theft or loss of equipment, system intrusion or hacking, malware and unintended posting to a web page. Once it has been established that a data compromise has taken place, the loss of data becomes the overriding consideration in the response.

Some example scenarios:

  • A laptop containing sensitive information is stolen (physical intrusion or theft).
  • Sensitive information is inadvertently posted on a web site without access restrictions (configuration error). 
  • Access restrictions are inadvertently changed or removed, exposing the data (configuration error).
  • A system compromise raises questions as to the continuing confidentiality of the data (intrusion).  
  • Keylogging software or other spyware is found on a host (malware). 

Recovery advice depends on the particular compromise vector.  Refer to advice on the presenting incident as well as responding to the data exposure issue.

  • Preserve any log files that show access to the sensitive data.
  • Secure all copies of the material from further compromise using the most suitable method(s):
    • Remove the sensitive data from the host or web pages
    • Disconnect the host from the network
    • Physically secure the data in a location with limited (and, if possible, logged) access.   Suggested method:
      • Place the material in an envelope
      • Seal the envelope and sign across the sealed flap
      • Secure the in a locked drawer or cabinet
  • Notify key staff.   This may include:
  • Include information as to the scope of the loss.  Suggested descriptive metrics:
    • the type of data.  Examples include:
    • estimate of the number of records exposed or lost
    • estimate of the number of individuals that may be impacted
  • If the material was on a web site:



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