Type Confusion Affecting cryptography package, versions [37.0.0,43.0.1)

Affected versions of this package are vulnerable to Type Confusion in the do_x509_check() function in x509/v3_utl.c, which is responsible for certificate name checks. An application that specifies an expected DNS name, Email address or IP address that performs a name check on an otherName subject alternative name of an X.509 certificate can be made to crash when it attempts to read an invalid memory address.

Note: Users that are building cryptography source ("sdist") are responsible for upgrading their copy of OpenSSL.

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

• High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

• Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

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