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All about unix linux freebsd and FAQ for Packetlove.com Web hosting , Mail hosting , VoIP + IP PBX server => All Security via cyber space relate golfreeze task. => Topic started by: golfreeze on กุมภาพันธ์ 11, 2015, 11:40:37 pm
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very serious security problem has been found in the GNU C Library (Glibc) called GHOST.
How can I fix GHOST vulnerability and protect my Linux server against the attack?
How do I verify that my server has been fixed against the Glibc GHOST vulnerability?
A very serious security problem has been found and patched in the GNU C Library called Glibc. It was announced on 27th January 2015.
http://www.cyberciti.biz/faq/cve-2015-0235-patch-ghost-on-debian-ubuntu-fedora-centos-rhel-linux/ (http://www.cyberciti.biz/faq/cve-2015-0235-patch-ghost-on-debian-ubuntu-fedora-centos-rhel-linux/)
http://www.openwall.com/lists/oss-security/2015/01/27/9 (http://www.openwall.com/lists/oss-security/2015/01/27/9)
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/* ghosttest.c: GHOST vulnerability tester */
/* Credit: http://www.openwall.com/lists/oss-security/2015/01/27/9 (http://www.openwall.com/lists/oss-security/2015/01/27/9) */
#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);
}
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#gcc ghosttest.c -o ghosttest
#./ghosttest