RHSA-2011:1851Critical

Red Hat Security Advisory: krb5 security update

Published
December 27, 2011
Last Modified
June 27, 2026

🔗 CVE IDs covered (1)

CVE-2011-4862 →

📋 Description

CVE-2011-4862 — krb5: telnet client and server encrypt_keyid heap-based buffer overflow

🎯 Affected products136

  • RHEL Desktop Workstation (v. 5 client)
  • Red Hat Enterprise Linux (v. 5 server)
  • Red Hat Enterprise Linux AS version 4
  • Red Hat Enterprise Linux Desktop (v. 5 client)
  • Red Hat Enterprise Linux Desktop version 4
  • Red Hat Enterprise Linux ES version 4
  • Red Hat Enterprise Linux WS version 4
  • krb5-0:1.3.4-65.el4.src as a component of Red Hat Enterprise Linux AS version 4
  • krb5-0:1.3.4-65.el4.src as a component of Red Hat Enterprise Linux Desktop version 4
  • krb5-0:1.3.4-65.el4.src as a component of Red Hat Enterprise Linux ES version 4
  • krb5-0:1.3.4-65.el4.src as a component of Red Hat Enterprise Linux WS version 4
  • krb5-0:1.6.1-63.el5_7.src as a component of RHEL Desktop Workstation (v. 5 client)
  • krb5-0:1.6.1-63.el5_7.src as a component of Red Hat Enterprise Linux (v. 5 server)
  • krb5-0:1.6.1-63.el5_7.src as a component of Red Hat Enterprise Linux Desktop (v. 5 client)
  • krb5-debuginfo-0:1.3.4-65.el4.i386 as a component of Red Hat Enterprise Linux AS version 4
  • krb5-debuginfo-0:1.3.4-65.el4.i386 as a component of Red Hat Enterprise Linux Desktop version 4
  • krb5-debuginfo-0:1.3.4-65.el4.i386 as a component of Red Hat Enterprise Linux ES version 4
  • krb5-debuginfo-0:1.3.4-65.el4.i386 as a component of Red Hat Enterprise Linux WS version 4
  • krb5-debuginfo-0:1.3.4-65.el4.ia64 as a component of Red Hat Enterprise Linux AS version 4
  • krb5-debuginfo-0:1.3.4-65.el4.ia64 as a component of Red Hat Enterprise Linux ES version 4
  • krb5-debuginfo-0:1.3.4-65.el4.ia64 as a component of Red Hat Enterprise Linux WS version 4
  • krb5-debuginfo-0:1.3.4-65.el4.ppc as a component of Red Hat Enterprise Linux AS version 4
  • krb5-debuginfo-0:1.3.4-65.el4.ppc64 as a component of Red Hat Enterprise Linux AS version 4
  • krb5-debuginfo-0:1.3.4-65.el4.s390 as a component of Red Hat Enterprise Linux AS version 4
  • krb5-debuginfo-0:1.3.4-65.el4.s390x as a component of Red Hat Enterprise Linux AS version 4
  • krb5-debuginfo-0:1.3.4-65.el4.x86_64 as a component of Red Hat Enterprise Linux AS version 4
  • krb5-debuginfo-0:1.3.4-65.el4.x86_64 as a component of Red Hat Enterprise Linux Desktop version 4
  • krb5-debuginfo-0:1.3.4-65.el4.x86_64 as a component of Red Hat Enterprise Linux ES version 4
  • krb5-debuginfo-0:1.3.4-65.el4.x86_64 as a component of Red Hat Enterprise Linux WS version 4
  • krb5-debuginfo-0:1.6.1-63.el5_7.i386 as a component of RHEL Desktop Workstation (v. 5 client)
  • +106 more not shown

✅ Remediation

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 commands 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

🔗 References (5)