Vulnerability CVE-2016-20013
Published: 2022-02-19

Description:
sha256crypt and sha512crypt through 0.6 allow attackers to cause a denial of service (CPU consumption) because the algorithm's runtime is proportional to the square of the length of the password.

 References:
https://twitter.com/solardiz/status/795601240151457793
https://pthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous/
https://akkadia.org/drepper/SHA-crypt.txt
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