7.8 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
Kerberos is an authentication system which allows clients and services to authenticate to each other with the help of a trusted third party, a Kerberos Key Distribution Center (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 over-read flaw was found in the way MIT Kerberos handled certain requests. A man-in-the-middle attacker with a valid Kerberos ticket who is able to inject packets into a client or server application’s GSSAPI session could use this flaw to crash the application. (CVE-2014-4341) This update also fixes the following bugs: * Prior to this update, the libkrb5 library occasionally attempted to free already freed memory when encrypting credentials. As a consequence, the calling process terminated unexpectedly with a segmentation fault. With this update, libkrb5 frees memory correctly, which allows the credentials to be encrypted appropriately and thus prevents the mentioned crash. (BZ#1004632) * Previously, when the krb5 client library was waiting for a response from a server, the timeout variable in certain cases became a negative number. Consequently, the client could enter a loop while checking for responses. With this update, the client logic has been modified and the described error no longer occurs. (BZ#1089732) All krb5 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, the krb5kdc daemon will be restarted automatically.
advisories.mageia.org/MGASA-2014-0345.html
aix.software.ibm.com/aix/efixes/security/nas_advisory1.asc
krbdev.mit.edu/rt/Ticket/Display.html?id=7970
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rhn.redhat.com/errata/RHSA-2015-0439.html
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secunia.com/advisories/60082
secunia.com/advisories/60448
secunia.com/advisories/61051
support.f5.com/kb/en-us/solutions/public/15000/500/sol15561.html
www.debian.org/security/2014/dsa-3000
www.mandriva.com/security/advisories?name=MDVSA-2014:165
www.osvdb.org/109389
www.securityfocus.com/bid/69160
www.securitytracker.com/id/1030706
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=1121877
exchange.xforce.ibmcloud.com/vulnerabilities/95210
github.com/krb5/krb5/commit/524688ce87a15fc75f87efc8c039ba4c7d5c197b
github.com/krb5/krb5/commit/a7886f0ed1277c69142b14a2c6629175a6331edc
rhn.redhat.com/errata/RHSA-2014-1245.html