CVE-2020-28942

Description

An issue exists in PrimeKey EJBCA before 7.4.3 when enrolling with EST while proxied through an RA over the Peers protocol. As a part of EJBCA's domain security model, the peer connector allows the restriction of client certificates (for the RA, not the end user) to a limited set of allowed CAs, thus restricting the accessibility of that RA to the rights it has within a specific role. While this works for other protocols such as CMP, it was found that the EJBCA enrollment over an EST implementation bypasses this check, allowing enrollment with a valid client certificate through any functioning and authenticated RA connected to the CA. NOTE: an attacker must already have a trusted client certificate and authorization to enroll against the targeted CA.

How to fix CVE-2020-28942

To remediate CVE-2020-28942, upgrade the affected package to a fixed version below.

• —upgrade to 7.4.3 or later

Is CVE-2020-28942 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 7.4.3

CVSS scores

References (2)

• WEBnvd.nist.gov/vuln/detail/CVE-2020-28942
• WEBsupport.primekey.com/news/posts/40