Threats affecting pkg:github/Crypt-OpenSSL-PKCS12

Crypt::OpenSSL::PKCS12 versions before 1.98 for Perl allow a NULL pointer dereference in print_attribute via a zero length BMPSTRING attribute. print_attribute() sizes the destination buffer for a BMPSTRING attribute from its declared byte length with `Renew(*attribute, length, char)`. A zero length attribute makes that a zero size reallocation, which Perl implements as a free returning NULL, so the buffer pointer becomes NULL, the following `strncpy` copies nothing, and the caller dereferences NULL in the `strlen()` it passes to `newSVpvn()`. A zero length BMPSTRING is even length, so the ASN.1 decoder accepts it and the value reaches this code. The UTF8STRING, OCTET STRING and BIT STRING arms size on `length + 1` or `length * 4 + 1` and are unaffected. Any caller that passes an untrusted PKCS#12 file to info_as_hash() can crash the process. info() prints attribute values directly without sizing a buffer and is unaffected.

Crypt::OpenSSL::PKCS12 versions before 1.96 for Perl permits a heap OOB read in print_attribute UTF8STRING path. print_attribute() copies a UTF8STRING ASN.1 attribute value into a heap buffer sized exactly to its declared length via strncpy, leaving no NUL terminator. Downstream callers run strlen() on the result and pass the inflated length to newSVpvn(), copying attacker-influenced adjacent heap bytes into a Perl scalar.

Crypt::OpenSSL::PKCS12 versions through 1.94 for Perl improperly handle passwords containing embedded NULL bytes by truncating them at the first NULL character. This occurs because the password parameter is treated as a null-terminated C string, causing loss of entropy in binary or derived passwords without any warning. This vulnerability can lead to compromised confidentiality, integrity, and availability of cryptographic operations relying on these passwords.

Crypt::OpenSSL::PKCS12 versions through 1.94 for Perl contain a critical out-of-bounds write vulnerability triggered when parsing a specially crafted PKCS12 file with a large OCTET STRING or BIT STRING attribute. This flaw arises from a signed integer overflow during size calculation, potentially allowing remote code execution. The vulnerability has a CVSS score of 9.8, indicating critical severity. A patch is available, and since this is a cloud service, the vendor typically manages remediation server-side. No known exploits are reported in the wild at this time.