1. 代码编辑
#include <netdb.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #define CANARY "in_the_coal_mine" struct { char buffer[1024]; char canary[sizeof(CANARY)]; } temp = { "buffer", CANARY }; int main(void) { struct hostent resbuf; struct hostent *result; int herrno; int retval; /*** strlen (name) = size_needed -sizeof (*host_addr) - sizeof (*h_addr_ptrs) - 1; ***/ size_t len = sizeof(temp.buffer) -16*sizeof(unsigned char) - 2*sizeof(char *) - 1; char name[sizeof(temp.buffer)]; memset(name, ‘0‘, len); name[len] = ‘\0‘; retval = gethostbyname_r(name,&resbuf, temp.buffer, sizeof(temp.buffer), &result, &herrno); if (strcmp(temp.canary, CANARY) !=0) { puts("vulnerable"); exit(EXIT_SUCCESS); } if (retval == ERANGE) { puts("notvulnerable"); exit(EXIT_SUCCESS); } puts("should nothappen"); exit(EXIT_FAILURE); }
2. 编译代码
$gcc GHOST.c -o GHOST
3. 漏洞检测:
$./GHOST
vulnerable
表示存在漏洞,需要进行修复。
$./GHOST
notvulnerable
表示修复成功。
4. 漏洞修复
建议修补方案
Centos 5/6/7:
yum update glibc
Ubuntu 12/14
apt-get update
apt-get install libc6
Debian 6
wget -O /etc/apt/sources.list.d/debian6-lts.list http://mirrors.aliyun.com/repo/debian6-lts.list
apt-get update
apt-get install libc6
Debian 7
apt-get update
apt-get install libc6
Opensuse 13
zypper refresh
zypper update glibc*
原文地址:http://blog.csdn.net/jiazhen/article/details/43647057