CVE-2020-8631

Publication date 5 February 2020

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
cloud-init	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Not affected
	19.10 eoan	Ignored end of life
	18.04 LTS bionic	Fixed 20.2-45-g5f7825e2-0ubuntu1~18.04.1
	16.04 LTS xenial	Ignored patched version in updates pocket
	14.04 LTS trusty	Not in release

Notes

ccdm94

This CVE has been patched in Xenial ESM. The patch, however, has been added only to the updates pocket, and since cloud-init is only used during first boot (pulling from updates), there should not be a need to add this to the security pocket.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
cloud-init	Upstream: https://github.com/canonical/cloud-init/blob/3e2f7356effc9e9cccc5ae945846279804eedc46

Severity score breakdown

Parameter	Value
Base score	5.5 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N