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Access of Resource Using Incompatible Type ('Type Confusion')

CVE-2021-23438

High
9.8/10

Summary

A Type Confusion vulnerability was present in the mpath package versions prior to 0.8.4 that could lead to a bypass of CVE-2018-16490. In particular, the condition "ignoreProperties.indexOf(parts[i]) !== -1" returns "-1" "if parts[i] are ['__proto__']". This is because the method that has been called if the input is an array is "Array.prototype.indexOf()" and not "String.prototype.indexOf()". They behave differently depending on the type of input.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • NONE
  • HIGH
  • HIGH

CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')

The program allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

References

Advisory Timeline

  • Published