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Red Hat Security Advisory 2011-1854-01

Red Hat Security Advisory 2011-1854-01
Posted Dec 29, 2011
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2011-1854-01 - The krb5-appl packages provide Kerberos-aware telnet, ftp, rcp, rsh, and rlogin clients and servers. Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third-party, the Key Distribution Center. A buffer overflow flaw was found in the MIT krb5 telnet daemon. A remote attacker who can access the telnet port of a target machine could use this flaw to execute arbitrary code as root. Note that the krb5 telnet daemon is not enabled by default in any version of Red Hat Enterprise Linux. In addition, the default firewall rules block remote access to the telnet port. This flaw does not affect the telnet daemon distributed in the telnet-server package.

tags | advisory, remote, overflow, arbitrary, root
systems | linux, redhat
advisories | CVE-2011-4862
MD5 | 2354bff33b377bbd83053cc59dee5612

Red Hat Security Advisory 2011-1854-01

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=====================================================================
Red Hat Security Advisory

Synopsis: Critical: krb5-appl security update
Advisory ID: RHSA-2011:1854-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-1854.html
Issue date: 2011-12-28
CVE Names: CVE-2011-4862
=====================================================================

1. Summary:

Updated krb5-appl packages that fix one security issue are now available
for Red Hat Enterprise Linux 6.0 and 6.1 Extended Update Support.

The Red Hat Security Response Team has rated this update as having critical
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server EUS (v. 6.0) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server EUS (v. 6.1) - i386, ppc64, s390x, x86_64

3. Description:

The krb5-appl packages provide Kerberos-aware telnet, ftp, rcp, rsh, and
rlogin clients and servers. Kerberos is a network authentication system
which allows clients and servers to authenticate to each other using
symmetric encryption and a trusted third-party, the Key Distribution Center
(KDC).

A buffer overflow flaw was found in the MIT krb5 telnet daemon (telnetd).
A remote attacker who can access the telnet port of a target machine could
use this flaw to execute arbitrary code as root. (CVE-2011-4862)

Note that the krb5 telnet daemon is not enabled by default in any version
of Red Hat Enterprise Linux. In addition, the default firewall rules block
remote access to the telnet port. This flaw does not affect the telnet
daemon distributed in the telnet-server package.

For users who have installed the krb5-appl-servers package, have enabled
the krb5 telnet daemon, and have it accessible remotely, this update should
be applied immediately.

All krb5-appl-server users should upgrade to these updated packages, which
contain a backported patch to correct this issue.

4. Solution:

The krb5 telnet daemon is an xinetd service. You can determine if krb5
telnetd is enabled with the commands:

/sbin/chkconfig --list krb5-telnet
/sbin/chkconfig --list ekrb5-telnet

The output of these command will display "on" if krb5 telnet is enabled.
krb5 telnet daemon can be immediately disabled with the commands:

/sbin/chkconfig krb5-telnet off
/sbin/chkconfig ekrb5-telnet off

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

770325 - CVE-2011-4862 krb5: remote buffer overflow in kerberized telnet daemon

6. Package List:

Red Hat Enterprise Linux Server EUS (v. 6.0):

Source:
krb5-appl-1.0.1-1.el6_0.1.src.rpm

i386:
krb5-appl-clients-1.0.1-1.el6_0.1.i686.rpm
krb5-appl-debuginfo-1.0.1-1.el6_0.1.i686.rpm
krb5-appl-servers-1.0.1-1.el6_0.1.i686.rpm

ppc64:
krb5-appl-clients-1.0.1-1.el6_0.1.ppc64.rpm
krb5-appl-debuginfo-1.0.1-1.el6_0.1.ppc64.rpm
krb5-appl-servers-1.0.1-1.el6_0.1.ppc64.rpm

s390x:
krb5-appl-clients-1.0.1-1.el6_0.1.s390x.rpm
krb5-appl-debuginfo-1.0.1-1.el6_0.1.s390x.rpm
krb5-appl-servers-1.0.1-1.el6_0.1.s390x.rpm

x86_64:
krb5-appl-clients-1.0.1-1.el6_0.1.x86_64.rpm
krb5-appl-debuginfo-1.0.1-1.el6_0.1.x86_64.rpm
krb5-appl-servers-1.0.1-1.el6_0.1.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 6.1):

Source:
krb5-appl-1.0.1-2.el6_1.3.src.rpm

i386:
krb5-appl-clients-1.0.1-2.el6_1.3.i686.rpm
krb5-appl-debuginfo-1.0.1-2.el6_1.3.i686.rpm
krb5-appl-servers-1.0.1-2.el6_1.3.i686.rpm

ppc64:
krb5-appl-clients-1.0.1-2.el6_1.3.ppc64.rpm
krb5-appl-debuginfo-1.0.1-2.el6_1.3.ppc64.rpm
krb5-appl-servers-1.0.1-2.el6_1.3.ppc64.rpm

s390x:
krb5-appl-clients-1.0.1-2.el6_1.3.s390x.rpm
krb5-appl-debuginfo-1.0.1-2.el6_1.3.s390x.rpm
krb5-appl-servers-1.0.1-2.el6_1.3.s390x.rpm

x86_64:
krb5-appl-clients-1.0.1-2.el6_1.3.x86_64.rpm
krb5-appl-debuginfo-1.0.1-2.el6_1.3.x86_64.rpm
krb5-appl-servers-1.0.1-2.el6_1.3.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-4862.html
https://access.redhat.com/security/updates/classification/#critical
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-008.txt

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2011 Red Hat, Inc.
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