Linux glibc幽靈漏洞修復方法

關于這個漏洞網上很多介紹,在這里就不說了，想了解的童鞋點擊下面的連接

CVE-2015-0235：Linux Glibc幽靈漏洞允許黑客遠程獲取系統權限

測試漏洞是否存在: 

把下面的代碼保存為gistfile1.c

#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("not vulnerable");
    exit(EXIT_SUCCESS);
  }
  puts("should not happen");
  exit(EXIT_FAILURE);
}
#* from http://www.openwall.com/lists/oss-security/2015/01/27/9 */

然后在服務器上執行：

 gcc gistfile1.c -o CVE-2015-0235
 ./CVE-2015-0235

如果提示:vulnerable 就說明存在漏洞.

修復方法:

執行這些命令即可

yum clean all 
yum makecache
yum -y install glibc* 

來自：http://blog.csdn.net/sikers/article/details/43230503