CVE:CVE-2013-7423
CNNVD:CNNVD-201502-362
GNU C Library（又名glibc，libc6）是一种按照LGPL许可协议发布的开源免费的C语言编译程序。
GNU C Library 2.20及之前版本的resolv/res_send.c文件中的‘send_dg’函数存在安全漏洞，该漏洞源于程序没有正确重用文件描述符。远程攻击者可借助大量请求利用该漏洞向任意位置发送DNS查询。
solution:Upgrade redhat enterprise_linux_server_aus to a higher version than 6.5,and avoid the version 6.5; Upgrade canonical ubuntu_linux to a higher version than 10.04,12.04,14.04,14.10,and avoid the version 10.04,12.04,14.04,14.10; Upgrade opensuse opensuse to a higher version than 13.1,13.2,and avoid the version 13.1,13.2; Upgrade gnu glibc to a higher version than 2.20,and avoid the version (,2.20)