Package Instance

NULL Pointer Dereference
An invalid pointer dereference on read can be triggered when an application tries to load malformed PKCS7 data with the d2i_PKCS7(), d2i_PKCS7_bio() or d2i_PKCS7_fp() functions. The result of the dereference is an application crash which could lead to a denial of service attack. The TLS implementation in OpenSSL does not call this function however third party applications might call these functions on untrusted data.

Loop with Unreachable Exit Condition ('Infinite Loop')
Internally libssl in OpenSSL calls X509_verify_cert() on the client side to verify a certificate supplied by a server. The exact behaviour will depend on the application but it could result in crashes, infinite loops or other similar incorrect responses.

NULL Pointer Dereference
An invalid pointer dereference on read can be triggered when an application tries to check a malformed DSA public key by the EVP_PKEY_public_check() function. This will most likely lead to an application crash. This function can be called on public keys supplied from untrusted sources which could allow an attacker to cause a denial of service attack. The TLS implementation in OpenSSL does not call this function but applications might call the function if there are additional security requirements imposed by standards such as FIPS 140-3.