RHSA-2011:1853Critical

Red Hat Security Advisory: krb5 security update

Published
December 28, 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 products69

  • Red Hat Enterprise Linux AS (v. 3 ELS)
  • Red Hat Enterprise Linux ES (v. 3 ELS)
  • Red Hat Enterprise Linux EUS (v. 5.6 server)
  • Red Hat Enterprise Linux Long Life (v. 5.3 server)
  • krb5-0:1.2.7-73.src as a component of Red Hat Enterprise Linux AS (v. 3 ELS)
  • krb5-0:1.2.7-73.src as a component of Red Hat Enterprise Linux ES (v. 3 ELS)
  • krb5-0:1.6.1-31.el5_3.5.src as a component of Red Hat Enterprise Linux Long Life (v. 5.3 server)
  • krb5-0:1.6.1-55.el5_6.3.src as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-debuginfo-0:1.2.7-73.i386 as a component of Red Hat Enterprise Linux AS (v. 3 ELS)
  • krb5-debuginfo-0:1.2.7-73.i386 as a component of Red Hat Enterprise Linux ES (v. 3 ELS)
  • krb5-debuginfo-0:1.6.1-31.el5_3.5.i386 as a component of Red Hat Enterprise Linux Long Life (v. 5.3 server)
  • krb5-debuginfo-0:1.6.1-31.el5_3.5.ia64 as a component of Red Hat Enterprise Linux Long Life (v. 5.3 server)
  • krb5-debuginfo-0:1.6.1-31.el5_3.5.x86_64 as a component of Red Hat Enterprise Linux Long Life (v. 5.3 server)
  • krb5-debuginfo-0:1.6.1-55.el5_6.3.i386 as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-debuginfo-0:1.6.1-55.el5_6.3.ia64 as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-debuginfo-0:1.6.1-55.el5_6.3.ppc as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-debuginfo-0:1.6.1-55.el5_6.3.ppc64 as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-debuginfo-0:1.6.1-55.el5_6.3.s390 as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-debuginfo-0:1.6.1-55.el5_6.3.s390x as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-debuginfo-0:1.6.1-55.el5_6.3.x86_64 as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-devel-0:1.2.7-73.i386 as a component of Red Hat Enterprise Linux AS (v. 3 ELS)
  • krb5-devel-0:1.2.7-73.i386 as a component of Red Hat Enterprise Linux ES (v. 3 ELS)
  • krb5-devel-0:1.6.1-31.el5_3.5.i386 as a component of Red Hat Enterprise Linux Long Life (v. 5.3 server)
  • krb5-devel-0:1.6.1-31.el5_3.5.ia64 as a component of Red Hat Enterprise Linux Long Life (v. 5.3 server)
  • krb5-devel-0:1.6.1-31.el5_3.5.x86_64 as a component of Red Hat Enterprise Linux Long Life (v. 5.3 server)
  • krb5-devel-0:1.6.1-55.el5_6.3.i386 as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-devel-0:1.6.1-55.el5_6.3.ia64 as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-devel-0:1.6.1-55.el5_6.3.ppc as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-devel-0:1.6.1-55.el5_6.3.ppc64 as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • krb5-devel-0:1.6.1-55.el5_6.3.s390 as a component of Red Hat Enterprise Linux EUS (v. 5.6 server)
  • +39 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)