#VU31890 Improper Certificate Validation in Go programming language - CVE-2020-14039

Vulnerability identifier: #VU31890

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-14039

CWE-ID: CWE-295

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Go programming language
Universal components / Libraries / Scripting languages

Vendor: Google

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists when "VerifyOptions.Roots" is nil, "Certificate.Verify" does not check the EKU requirements specified in "VerifyOptions.KeyUsages".

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Go programming language: 1.13 - 1.14.4

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External links
https://lists.opensuse.org/opensuse-security-announce/2020-07/msg00077.html
https://groups.google.com/forum/#!forum/golang-announce
https://groups.google.com/forum/#!topic/golang-announce/XZNfaiwgt2w

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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 Internet.

Is there known malware, which exploits this vulnerability?

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