Xxe.ql

/**
 * @name XML external entity expansion
 * @description Parsing user input as an XML document with external
 *              entity expansion is vulnerable to XXE attacks.
 * @kind path-problem
 * @problem.severity error
 * @security-severity 9.1
 * @precision high
 * @id py/xxe
 * @tags security
 *       external/cwe/cwe-611
 *       external/cwe/cwe-827
 */

import python
import semmle.python.security.dataflow.XxeQuery
import DataFlow::PathGraph

from Configuration cfg, DataFlow::PathNode source, DataFlow::PathNode sink
where cfg.hasFlowPath(source, sink)
select sink.getNode(), source, sink,
  "XML parsing depends on a $@ without guarding against external entity expansion.",
  source.getNode(), "user-provided value"