Detections
Analytics
CVE-2019-16764
medium
Description
The use of `String.to_atom/1` in PowAssent is susceptible to denial of service attacks. In `PowAssent.Phoenix.AuthorizationController` a value is fetched from the user provided params, and `String.to_atom/1` is used to convert the binary value to an atom so it can be used to fetch the provider configuration value. This is unsafe as it is user provided data, and can be used to fill up the whole atom table of ~1M which will cause the app to crash.
References
https://hex.pm/packages/pow_assent
https://github.com/pow-auth/pow_assent/security/advisories/GHSA-368c-xvrv-x986
https://github.com/pow-auth/pow_assent/commit/026105eeecc0e3c2f807e7109e745ea93c0fd9cf
http://erlang.org/doc/efficiency_guide/commoncaveats.html#list_to_atom-1