CVE:CVE-2001-1155
CNNVD:CNNVD-200108-140
启用PARANOID ACL选项的FreeBSD 4.1.1到4.3版本的TCP Wrappers (tcp_wrappers)不正确监测DNS反向查找，远程攻击者可以借助DNS欺骗绕过原有访问限制。
solution:Upgrade freebsd freebsd to a higher version than 4.1.1,4.2,4.3,and avoid the version 4.1.1,4.2,4.3