CVE-2025-48637 Android内核mem_protect.c整数溢出导致本地权限提升漏洞

/* * CVE-2025-48637 PoC - Integer Overflow in mem_protect.c * This is a conceptual PoC demonstrating the vulnerability pattern. * Actual exploitation requires specific kernel conditions and offsets. * * WARNING: This code is for educational purposes only. * Do not use for malicious purposes. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> /* Simulated vulnerable function pattern from mem_protect.c */ void vulnerable_mem_protect(unsigned long size, unsigned long count) { unsigned long total_size; void *buffer; /* VULNERABLE: Integer overflow in size calculation */ /* In real kernel code, this could wrap around due to overflow */ total_size = size * count; /* If integer overflow occurs, total_size becomes small */ printf("Calculated size: %lu\n", total_size); /* Allocating based on potentially overflowed size */ buffer = malloc(total_size); if (buffer == NULL) { printf("Allocation failed\n"); return; } /* VULNERABLE: Writing more data than allocated buffer */ /* This simulates out-of-bounds write due to overflow */ memset(buffer, 0x41, size * count * 2); // Write double the allocated size printf("Out-of-bounds write triggered!\n"); free(buffer); } /* Example trigger - in real attack, this would be done via syscall/ioctl */ int main(int argc, char *argv[]) { unsigned long size = 0xFFFFFFFF; /* Max uint32 value */ unsigned long count = 2; printf("CVE-2025-48637 - Integer Overflow PoC\n"); printf("Simulating mem_protect.c vulnerability...\n\n"); /* Trigger the vulnerable code path */ vulnerable_mem_protect(size, count); printf("\nIn real exploitation:\n"); printf("- Attacker would trigger via kernel interface\n"); printf("- Overflow allows writing beyond allocated buffer\n"); printf("- Could lead to privilege escalation\n"); return 0; } /* * For actual kernel exploitation: * 1. Identify vulnerable syscall/ioctl interface * 2. Craft specific size/count values to trigger overflow * 3. Use heap grooming to control overflow target * 4. Overwrite function pointers or metadata * 5. Achieve arbitrary code execution as root * * Note: Modern kernel protections (SMEP, SMAP, KASLR, CFI) * may require additional bypass techniques. */