RHEL 6 : krb5-appl (RHSA-2011:1852)

Critical Nessus Plugin ID 57409


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


Updated krb5-appl packages that fix one security issue are now available for Red Hat Enterprise Linux 6.

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.

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.

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.


Update the affected krb5-appl-clients, krb5-appl-debuginfo and / or krb5-appl-servers packages.

See Also




Plugin Details

Severity: Critical

ID: 57409

File Name: redhat-RHSA-2011-1852.nasl

Version: $Revision: 1.13 $

Type: local

Agent: unix

Published: 2011/12/28

Modified: 2017/01/04

Dependencies: 12634

Risk Information

Risk Factor: Critical


Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:krb5-appl-clients, p-cpe:/a:redhat:enterprise_linux:krb5-appl-debuginfo, p-cpe:/a:redhat:enterprise_linux:krb5-appl-servers, cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:6.2

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2011/12/27

Exploitable With

Core Impact

Metasploit (Linux BSD-derived Telnet Service Encryption Key ID Buffer Overflow)

ExploitHub (EH-11-760)

Reference Information

CVE: CVE-2011-4862

OSVDB: 78020

RHSA: 2011:1852