#VU75604 Improper Certificate Validation in CPAN - CVE-2023-31484

Vulnerability identifier: #VU75604

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-31484

CWE-ID: CWE-295

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
CPAN
Universal components / Libraries / Programming Languages & Components

Vendor: CPAN

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to missing verification of the TLS certificate when downloading distributions. A remote attacker can perform MitM attack and trick the application into downloading a malicious file.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

CPAN: 1.80 - 2.34

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External links
http://github.com/andk/cpanpm/pull/175
http://www.openwall.com/lists/oss-security/2023/04/18/14
http://metacpan.org/dist/CPAN/changes
http://blog.hackeriet.no/perl-http-tiny-insecure-tls-default-affects-cpan-modules/
http://www.openwall.com/lists/oss-security/2023/04/29/1

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.