| Description: | Description:
The remote host is missing updates announced in
advisory RHSA-2011:1854.
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.
Solution:
Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date
http://rhn.redhat.com/errata/RHSA-2011-1854.html
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-008.txt
Risk factor : High
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