RHEL 2.1 / 3 : krb5 (RHSA-2008:0181)

This script is Copyright (C) 2008-2014 Tenable Network Security, Inc.


Synopsis :

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

Description :

Updated krb5 packages that fix multiple security issues are now
available for Red Hat Enterprise Linux 2.1 and 3.

This update has been rated as having critical security impact by the
Red Hat Security Response Team.

Kerberos is a network authentication system which allows clients and
servers to authenticate to each other through use of symmetric
encryption and a trusted third party, the KDC.

A flaw was found in the way the MIT Kerberos Authentication Service
and Key Distribution Center server (krb5kdc) handled Kerberos v4
protocol packets. An unauthenticated remote attacker could use this
flaw to crash the krb5kdc daemon, disclose portions of its memory, or
possibly execute arbitrary code using malformed or truncated Kerberos
v4 protocol requests. (CVE-2008-0062, CVE-2008-0063)

This issue only affected krb5kdc with Kerberos v4 protocol
compatibility enabled, which is the default setting on Red Hat
Enterprise Linux 4. Kerberos v4 protocol support can be disabled by
adding 'v4_mode=none' (without the quotes) to the '[kdcdefaults]'
section of /var/kerberos/krb5kdc/kdc.conf.

A flaw was found in the RPC library used by the MIT Kerberos kadmind
server. An unauthenticated remote attacker could use this flaw to
crash kadmind. This issue only affected systems with certain resource
limits configured and did not affect systems using default resource
limits used by Red Hat Enterprise Linux 2.1 or 3. (CVE-2008-0948)

Red Hat would like to thank MIT for reporting these issues.

All krb5 users are advised to update to these erratum packages which
contain backported fixes to correct these issues.

See also :

https://www.redhat.com/security/data/cve/CVE-2008-0062.html
https://www.redhat.com/security/data/cve/CVE-2008-0063.html
https://www.redhat.com/security/data/cve/CVE-2008-0948.html
http://rhn.redhat.com/errata/RHSA-2008-0181.html

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.8
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 31618 ()

Bugtraq ID: 28302
28303

CVE ID: CVE-2008-0062
CVE-2008-0063
CVE-2008-0947
CVE-2008-0948