krb5: multi-realm KDC null dereference leads to crash

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • CVE-2013-1418
  • krb5

Issue

  • If a KDC serves multiple realms, certain requests can cause setup_server_realm() to dereference a null pointer, crashing the KDC.

  • Is there a fix available for this vulnerability (CVE-2013-1418) in RHEL?

Resolution

  • The issue has been fixed in RHEL 5/6.

  • Refer following page regarding RHSA release information.

  • This vulnerability has a moderate impact score.

  • This only affects deployments of multiple realms from a single KDC. If your deployment matches this description and you know you are vulnerable, please open a new support case.

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