The remote Scientific Linux host is missing one or more security
A weakness was found in the way IPA clients communicated with IPA
servers when initially attempting to join IPA domains. As there was no
secure way to provide the IPA server's Certificate Authority (CA)
certificate to the client during a join, the IPA client enrollment
process was susceptible to man-in-the-middle attacks. This flaw could
allow an attacker to obtain access to the IPA server using the
credentials provided by an IPA client, including administrative access
to the entire domain if the join was performed using an
administrator's credentials. (CVE-2012-5484)
Note: This weakness was only exposed during the initial client join to
the realm, because the IPA client did not yet have the CA certificate
of the server. Once an IPA client has joined the realm and has
obtained the CA certificate of the IPA server, all further
communication is secure. If a client were using the OTP (one-time
password) method to join to the realm, an attacker could only obtain
unprivileged access to the server (enough to only join the realm).
This update must be installed on both the IPA client and IPA server.
When this update has been applied to the client but not the server,
ipa-client-install, in unattended mode, will fail if you do not have
the correct CA certificate locally, noting that you must use the
'--force' option to insecurely obtain the certificate. In interactive
mode, the certificate will try to be obtained securely from LDAP. If
this fails, you will be prompted to insecurely download the
certificate via HTTP. In the same situation when using OTP, LDAP will
not be queried and you will be prompted to insecurely download the
certificate via HTTP.
After installing the update, changes in LDAP are handled by
ipa-ldap-updater automatically and are effective immediately.
See also :
Update the affected packages.
Risk factor :
High / CVSS Base Score : 7.9