RHEL 6 : krb5 (RHSA-2016:0493)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated krb5 packages that fix two security issues are now available
for Red Hat Enterprise Linux 6.

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 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.

A memory leak flaw was found in the krb5_unparse_name() function of
the MIT Kerberos kadmind service. An authenticated attacker could
repeatedly send specially crafted requests to the server, which could
cause the server to consume large amounts of memory resources,
ultimately leading to a denial of service due to memory exhaustion.
(CVE-2015-8631)

An out-of-bounds read flaw was found in the kadmind service of MIT
Kerberos. An authenticated attacker could send a maliciously crafted
message to force kadmind to read beyond the end of allocated memory,
and write the memory contents to the KDC database if the attacker has
write permission, leading to information disclosure. (CVE-2015-8629)

The CVE-2015-8631 issue was discovered by Simo Sorce of Red Hat.

All krb5 users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing
the updated packages, running Kerberos services (krb5kdc, kadmin, and
kprop) will be restarted automatically.

See also :

https://www.redhat.com/security/data/cve/CVE-2015-8629.html
https://www.redhat.com/security/data/cve/CVE-2015-8631.html
http://rhn.redhat.com/errata/RHSA-2016-0493.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.8
(CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C)
CVSS Temporal Score : 5.0
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 90116 ()

Bugtraq ID:

CVE ID: CVE-2015-8629
CVE-2015-8631

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