RHSA-2014:1389: krb5 security and bug fix update (Moderate)
Kerberos is a networked authentication system which allows clients and servers to authenticate to each other with the help of a trusted third party the Kerberos KDC. It was found that if a KDC served multiple realms certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request. (CVE-2013-1418 CVE-2013-6800) A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO acceptor for continuation tokens. A remote unauthenticated attacker could use this flaw to crash a GSSAPI-enabled server application. (CVE-2014-4344) A buffer overflow was found in the KADM5 administration server (kadmind) when it was used with an LDAP back end for the KDC database. A remote authenticated attacker could potentially use this flaw to execute arbitrary code on the system running kadmind. (CVE-2014-4345) Two buffer over-read flaws were found in the way MIT Kerberos handled certain requests. A remote unauthenticated attacker who is able to inject packets into a client or server application's GSSAPI session could use either of these flaws to crash the application. (CVE-2014-4341 CVE-2014-4342) A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An attacker able to spoof packets to appear as though they are from an GSSAPI acceptor could use this flaw to crash a client application that uses MIT Kerberos. (CVE-2014-4343) These updated krb5 packages also include several bug fixes. Space precludes documenting all of these changes in this advisory. Users are directed to the Red Hat Enterprise Linux 6.6 Technical Notes linked to in the References section for information on the most significant of these changes. All krb5 users are advised to upgrade to these updated packages which contain backported patches to correct these issues.
- Red Hat Enterprise Linux 6
- CentOS Linux 6