Use of Insufficiently Random Values Affecting cloud-init package, versions <0:19.3-4.amzn2


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.05% (16th percentile)

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  • Snyk IDSNYK-AMZN2-CLOUDINIT-1692347
  • published27 Sept 2021
  • disclosed5 Feb 2020

Introduced: 5 Feb 2020

CVE-2020-8631  (opens in a new tab)
CWE-330  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 cloud-init to version 0:19.3-4.amzn2 or higher.
This issue was patched in ALAS2-2021-1576.

NVD Description

Note: Versions mentioned in the description apply only to the upstream cloud-init package and not the cloud-init package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

cloud-init through 19.4 relies on Mersenne Twister for a random password, which makes it easier for attackers to predict passwords, because rand_str in cloudinit/util.py calls the random.choice function.

CVSS Scores

version 3.1