Oracle Linux 5 : krb5 (ELSA-2014-1245)

This script is Copyright (C) 2014-2016 Tenable Network Security, Inc.


Synopsis :

The remote Oracle Linux host is missing one or more security updates.

Description :

From Red Hat Security Advisory 2014:1245 :

Updated krb5 packages that fix multiple security issues and two bugs
are now available for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

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.

See also :

https://oss.oracle.com/pipermail/el-errata/2014-September/004455.html

Solution :

Update the affected krb5 packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 5.8
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Oracle Linux Local Security Checks

Nessus Plugin ID: 77738 ()

Bugtraq ID: 63555
63770
68909
69160

CVE ID: CVE-2013-1418
CVE-2013-6800
CVE-2014-4341
CVE-2014-4344

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