MEDIUM6.5
GHSA-5653-437f-5hmc
Denial of service
Quick fix
GHSA-5653-437f-5hmc — pow_assent: upgrade to the fixed version with the command below.
mix deps.update pow_assentDetails
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.
Are you affected?
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Affected packages
References
- https://github.com/pow-auth/pow_assent/security/advisories/GHSA-368c-xvrv-x986[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2019-16764[ADVISORY]
- https://github.com/pow-auth/pow_assent/commit/026105eeecc0e3c2f807e7109e745ea93c0fd9cf[WEB]
- https://github.com/pow-auth/pow_assent[PACKAGE]
- https://hex.pm/packages/pow_assent[WEB]
- http://erlang.org/doc/efficiency_guide/commoncaveats.html#list_to_atom-1[WEB]