The kadm5_modify_policy_internal function in
lib/kadm5/srv/svr_policy.c in the Kerberos administration daemon
(kadmind) in MIT Kerberos 5 (krb5) 1.5 through 1.6.2 does not properly
check return values when the policy does not exist, which might allow
remote authenticated users with the "modify policy" privilege to
execute arbitrary code via unspecified vectors that trigger a write to
an uninitialized pointer.
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