| Description: | Kerberos is a networked authentication system which allows clients andservers to authenticate to each other with the help of a trusted thirdparty, the Kerberos KDC.It was found that if a KDC served multiple realms, certain requests couldcause the setup_server_realm() function to dereference a NULL pointer.A remote, unauthenticated attacker could use this flaw to crash the KDCusing a specially crafted request. (CVE-2013-1418, CVE-2013-6800)A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGOacceptor for continuation tokens. A remote, unauthenticated attacker coulduse 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 arbitrarycode on the system running kadmind. (CVE-2014-4345)Two buffer over-read flaws were found in the way MIT Kerberos handledcertain requests. A remote, unauthenticated attacker who is able to injectpackets into a client or server application's GSSAPI session could useeither 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 anGSSAPI acceptor could use this flaw to crash a client application that usesMIT Kerberos. (CVE-2014-4343)These updated krb5 packages also include several bug fixes. Space precludesdocumenting all of these changes in this advisory. Users are directed tothe Red Hat Enterprise Linux 6.6 Technical Notes, linked to in theReferences section, for information on the most significant of thesechanges.All krb5 users are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues. |