PT-2022-7848 · Unknown · Sha256Crypt+1

Published 2022-02-19 · Updated 2022-03-03 · CVE-2016-20013

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions sha256crypt and sha512crypt versions through 0.6

Description The issue allows attackers to cause a denial of service due to CPU consumption. This is because the algorithm's runtime is proportional to the square of the length of the password.

Recommendations For versions through 0.6, consider restricting the maximum length of the password to minimize the risk of CPU consumption until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2016-20013

Affected Products

Sha256Crypt

Sha512Crypt

References · 10

• 🔥 https://pthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous · Exploit
• 🔥 https://akkadia.org/drepper/SHA-crypt.txt · Exploit
• https://cve.org/CVERecord?id=CVE-2016-20013 · Security Note
• https://ubuntu.com/security/CVE-2016-20013 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-20013 · Security Note
• https://osv.dev/vulnerability/CVE-2016-20013 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2016-20013 · Vendor Advisory
• https://t.me/cibsecurity/37818 · Telegram Post
• https://t.me/cvenotify/27509 · Telegram Post
• https://twitter.com/solardiz/status/795601240151457793 · Note