Type confusion

Overview

In mpath before 0.8.4 a type confusion vulnerability can lead to a bypass of CVE-2018-16490. In particular, the condition ignoreProperties.indexOf(parts[i]) !== -1 returns -1 if parts[i] is [‘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 the input.

Recommendation

Upgrade to version 0.8.4 or later

References

• CVE
• GitHub Advisory