The remote Redhat Enterprise Linux 4 / 5 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2011:1851 advisory.

    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-workstation package, have enabled the     telnet daemon, and have it accessible remotely, this update should be     applied immediately.

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

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

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RHEL 4 / 5 : krb5 (RHSA-2011:1851)

critical Nessus Plugin ID 57408

Version 1.25