[RHSA-2011:1854-01] Critical: krb5-appl security update

[news 28]

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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

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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 . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2011 Red Hat, Inc.

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