CVE:CVE-2010-2693
CNNVD:CNNVD-201007-131
FreeBSD是一种运行在Intel平台上、可以自由使用的开放源码Unix类系统，其中FreeBSD 4.5支持了SYN cache (syncache)和SYN cookies (syncookies)机制，提供对FLOOD拒绝服务攻击的保护功能。
FreeBSD 7.1至8.1-PRERELEASE版本在创建一个复制的mbuf缓存引用时不能复制只读标志，本地用户可以借助sendfile system call导致服务拒绝(系统文件损坏)和获取特权。
solution:Upgrade freebsd freebsd to a higher version than 7.1,7.1:pre-release,7.1:rc1,7.1:release-p1,7.1:release-p2,7.1:release-p4,7.1:release-p5,7.1:release-p6,7.2,7.2:pre-release,7.2:stable,7.3,8.0,8.1:pre-release,and avoid the version 7.1,7.1:pre-release,7.1:rc1,7.1:release-p1,7.1:release-p2,7.1:release-p4,7.1:release-p5,7.1:release-p6,7.2,7.2:pre-release,7.2:stable,7.3,8.0,8.1:pre-release