Question

Where can vulnerabilities occur in a computer system?

Answer 1

 computer security, a vulnerability is a weakness which can be exploited by a Threat Actor, such as an attacker, to perform unauthorised actions within a computer system. Vulnerabilities are the intersection of three elements: a system susceptibility or flaw, attacker access to the flaw, and attacker capability to exploit the flaw.[1] To exploit a vulnerability, an attacker must have at least one applicable tool or technique that can connect to a system weakness. In this frame, vulnerability is also known as the attack surface.

Vulnerability management is the cyclical practice of identifying, classifying, remediating, and mitigating vulnerabilities.[2]This practice generally refers to software vulnerabilities in computing systems.

A security risk is often incorrectly classified as a vulnerability. The use of vulnerability with the same meaning of risk can lead to confusion. The risk is the potential of a significant impact resulting from the exploit of a vulnerability. Then there are vulnerabilities without risk: for example when the affected asset has no value. A vulnerability with one or more known instances of working and fully implemented attacks is classified as an exploitable vulnerability — a vulnerability for which an exploit exists. The window of vulnerability is the time from when the security hole was introduced or manifested in deployed software, to when access was removed, a security fix was available/deployed, or the attacker was disabled—see zero-day attack.

Security bug (security defect) is a narrower concept: there are vulnerabilities that are not related to software: hardware, site, personnel vulnerabilities are examples of vulnerabilities that are not software security bugs.

Constructs in programming languages that are difficult to use properly can be a large source of vulnerabilities.

Answer 2

Spam, Phishing attacksD. End UsersReason: The biggest vulnerability to computer information security is the end user. Unlike applications that can be patched or systems that can be hardened, end users through unawareness and carelessness can expose IT sources to security threats.