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CVE-2016-20013

Date: February 18, 2022

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.

Severity Score

Related Resources (6)

https://nvd.nist.gov/vuln/detail/CVE-2016-20013
https://twitter.com/solardiz/status/795601240151457793
https://pthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous/
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-20013
https://akkadia.org/drepper/SHA-crypt.txt
https://www.mend.io/vulnerability-database/CVE-2016-20013

Severity Score

Weakness Type (CWE)

Allocation of Resources Without Limits or Throttling

CWE-770

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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