CVE-2020-16156

Publication date 13 December 2021

Last updated 25 August 2025

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

Description

CPAN 2.28 allows Signature Verification Bypass.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
perl	23.04 lunar	Fixed 5.36.0-4ubuntu2
	22.10 kinetic	Fixed 5.34.0-5ubuntu1.1
	22.04 LTS jammy	Fixed 5.34.0-3ubuntu1.1
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Fixed 5.30.0-9ubuntu0.3
	18.04 LTS bionic	Fixed 5.26.1-6ubuntu0.6
	16.04 LTS xenial	Fixed 5.22.1-9ubuntu0.9+esm1
	14.04 LTS trusty	Fixed 5.18.2-2ubuntu1.7+esm4

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Notes

rayveldkamp

Fix is in cpanpm 2.29

leosilva

using only ensured identified https mirrors could be a solution, as even perl modules if a trusted server is used its identity will be verified even in the absense of perl-module-signature.

Patch details

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

Package	Patch details
perl	Upstream: b27c51a Upstream: bcbf6d6 Upstream: 46fe910 Upstream: 7f9e5e8 Upstream: c03257d Upstream: 7d4d5e3 Upstream: 89b13ba

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H