CVE-2020-16156

Ubuntu Security Notice USN-5689-2

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

CPAN 2.28 allows Signature Verification Bypass.

CPAN versión 2.28, permite una Omisión de Verificación de Firmas

USN-5689-1 fixed a vulnerability in Perl. This update provides the corresponding update for Ubuntu 22.10. It was discovered that Perl incorrectly handled certain signature verification. An remote attacker could possibly use this issue to bypass signature verification.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-07-30 CVE Reserved
2021-12-13 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2025-04-01 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-347: Improper Verification of Cryptographic Signature

CAPEC

References (5)

URL	Tag	Source
https://metacpan.org/pod/distribution/CPAN/scripts/cpan	Product

URL	Date	SRC
http://blogs.perl.org/users/neilb/2021/11/addressing-cpan-vulnerabilities-related-to-checksums.html	2024-08-04
https://blog.hackeriet.no/cpan-signature-verification-vulnerabilities	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SD6RYOJII7HRJ6WVORFNVTYNOFY5JDXN	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SZ32AJIV4RHJMLWLU5QULGKMMIHYOMDC	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Perl Search vendor "Perl"		Comprehensive Perl Archive Network Search vendor "Perl" for product "Comprehensive Perl Archive Network"				2.28 Search vendor "Perl" for product "Comprehensive Perl Archive Network" and version "2.28"		perl		Affected
Perl Search vendor "Perl"		Comprehensive Perl Archive Network Search vendor "Perl" for product "Comprehensive Perl Archive Network"				2.28 Search vendor "Perl" for product "Comprehensive Perl Archive Network" and version "2.28"		trial, perl		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				35 Search vendor "Fedoraproject" for product "Fedora" and version "35"		-		Affected