Main Vulnerability Database Vulnerabilities #VU32983

Improper Certificate Validation in LibreSSL - CVE-2017-8301

Published: August 3, 2020

Vulnerability identifier: #VU32983

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-8301

CWE-ID: CWE-295

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to improper TLS certificate validation in the SSL_get_verify_result() function in LibreSSL. A remote attacker can bypass certificate validation process and perform MitM attack.

Affected software

LibreSSL
libressl (Alpine package)

How to mitigate CVE-2017-8301

Install updates from vendor's website.

LibreSSL - update to 2.5.4
libressl (Alpine package) - update to 2.5.3-r1

External References

http://seclists.org/oss-sec/2017/q2/145
http://www.securityfocus.com/bid/98076
https://github.com/libressl-portable/portable/issues/307
https://trac.nginx.org/nginx/ticket/1257

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