session_close(Session *s)
{
	struct ssh *ssh = active_state; /* XXX */
	u_int i;

	verbose("Close session: user %s from %.200s port %d id %d",
	    s->pw->pw_name,
	    ssh_remote_ipaddr(ssh),
	    ssh_remote_port(ssh),
	    s->self);

	if (s->ttyfd != -1)
		session_pty_cleanup(s);
	free(s->term);
	free(s->display);
	free(s->x11_chanids);
	free(s->auth_display);
	free(s->auth_data);
	free(s->auth_proto);
	free(s->subsys);
	if (s->env != NULL) {
		for (i = 0; i < s->num_env; i++) {
			free(s->env[i].name);
			free(s->env[i].val);
		}
		free(s->env);
	}
	session_proctitle(s);
	session_unused(s->self);
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.