Updated rhpki-common packages that fix a security issue are now available
for Red Hat Certificate System 7.2.
This update has been rated as having important security impact by the Red
Hat Security Response Team.
Red Hat Certificate System (RHCS) is an enterprise software system designed
to manage enterprise Public Key Infrastructure (PKI) deployments.
rhpki-common -- the Red Hat PKI Common Framework -- is required by the
following four RHCS subsystems: the Red Hat Certificate Authority; the Red
Hat Data Recovery Manager; the Red Hat Online Certificate Status Protocol
Manager; and the Red Hat Token Key Service.
A flaw was found in the way Red Hat Certificate System handled Extensions
in the certificate signing requests (CSR). All requested Extensions were
added to the issued certificate even if constraints were defined in the
Certificate Authority (CA) profile. An attacker could submit a CSR for a
subordinate CA certificate even if the CA configuration prohibited
subordinate CA certificates. This lead to a bypass of the intended security
policy, possibly simplifying man-in-the-middle attacks against users that
trust Certificate Authorities managed by Red Hat Certificate System.
All users of Red Hat Certificate System 7.2 should upgrade to these updated
packages, which resolves this issue.