check_1_6_dummy(kadm5_principal_ent_t entry, long mask,
                int n_ks_tuple, krb5_key_salt_tuple *ks_tuple, char **passptr)
{
    int i;
    char *password = *passptr;

    /* Old-style randkey operations disallowed tickets to start. */
    if (password == NULL || !(mask & KADM5_ATTRIBUTES) ||
        !(entry->attributes & KRB5_KDB_DISALLOW_ALL_TIX))
        return;

    /* The 1.6 dummy password was the octets 1..255. */
    for (i = 0; (unsigned char) password[i] == i + 1; i++);
    if (password[i] != '\0' || i != 255)
        return;

    /* This will make the caller use a random password instead. */
     *passptr = NULL;
 }

Focusing on credential management, this weakness arises when sensitive authentication data is improperly stored or handled, thereby exposing it to potential attackers.