CVE-2026-5448 wolfSSL X.509日期缓冲区溢出漏洞

#include <wolfssl/ssl.h> #include <wolfssl/wolfcrypt/asn1.h> // Conceptual PoC for CVE-2026-5448 // This demonstrates the vulnerable function call flow. // Actual exploitation requires a crafted certificate DER blob. int main() { WOLFSSL_CERT* cert; // Assume 'malicious_cert_der' contains a crafted certificate // with an excessively long date field in the validity structure. const unsigned char* malicious_cert_der = ...; long der_len = ...; // Load the certificate (simulated) cert = wolfSSL_X509_d2i(malicious_cert_der, der_len); if (cert) { char buffer[260]; // Target buffer to overflow // Trigger the vulnerability in compatibility layer // This call copies the date string without proper length check const char* date_str = wolfSSL_X509_notAfter(cert); if (date_str) { // If the date string is longer than the destination buffer in the // internal implementation or if the function itself overflows // internal stack, a crash occurs. printf("Date: %s\n", date_str); } wolfSSL_X509_free(cert); } return 0; }