Name XML Parser Attack
Summary Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. These adverse effects may include the parser crashing, consuming too much of a resource, executing too slowly, executing code supplied by an attacker, allowing usage of unintended system functionality, etc. An attacker's goal is to leverage parser failure to his or her advantage. In some cases it may be possible to jump from the data plane to the control plane via bad data being passed to an XML parser. [R.99.1]
Prerequisites An application uses an XML parser to perform transformation on user-controllable data. An application does not perform sufficient validation to ensure that user-controllable data is safe for an XML parser.
Solutions Carefully validate and sanitize all user-controllable data prior to passing it to the XML parser routine. Ensure that the resultant data is safe to pass to the XML parser. Perform validation on canonical data. Pick a robust implementation of an XML parser. Validate XML against a valid schema or DTD prior to parsing.
Related Weaknesses
CWE ID Description
CWE-20 Improper Input Validation
CWE-112 Missing XML Validation
CWE-674 Uncontrolled Recursion
CWE-770 Allocation of Resources Without Limits or Throttling
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