What is Supply Chain Attack in software security? Please provide some examples of such cases from the recent years.
A Supply Chain Attack is a type of cyber-attack that targets a vulnerability within the supply chain of a software development process. Rather than attacking the end product or the end user directly, the attacker infiltrates the system at an earlier stage, such as during the development, distribution, or even the update phase. This allows the attacker to compromise the software or hardware before it even reaches the end user, making it a particularly insidious form of attack.

Examples of Recent Supply Chain Attacks:
SolarWinds Attack (2020): This was a large-scale, sophisticated supply chain attack. Malicious actors compromised the infrastructure of SolarWinds, a company that creates software for businesses and government agencies. The attackers inserted a vulnerability into the software updates, affecting thousands of customers.

Codecov Breach (2021): Codecov, a code coverage solution provider, suffered a supply chain attack where unauthorized changes were made to its Bash Uploader script, potentially affecting its clients.

Kaseya VSA Attack (2021): Kaseya, an IT solutions provider, was targeted in a ransomware attack that affected its VSA software. The attackers exploited vulnerabilities in the software to deploy ransomware on the systems of Kaseya's clients.

Npm 'fallguys' Package (2020): A malicious package was published to the npm registry, mimicking a popular game. The package contained a script designed to steal sensitive files from the users' systems.

ASUS Live Update Utility (2019): ASUS's software update utility was compromised, and a malicious update was pushed to thousands of computers, aiming to target a specific list of users based on their network adapters' MAC addresses.
How can one protect themselves from this attack?
Here are some ways to protect yourself from a supply chain attack:

* **Do your due diligence on third-party vendors.** Before you work with a third-party vendor, make sure to do your research and understand their security practices. Ask them about their security policies, procedures, and training.
* **Use security tools to scan for vulnerabilities.** There are a number of security tools available that can scan for vulnerabilities in your software supply chain. These tools can help you identify and fix vulnerabilities before they can be exploited by attackers.
* **Keep your software up to date.** Software vendors often release security updates to fix vulnerabilities. Make sure to install these updates as soon as they are available.
* **Use a zero-trust architecture.** A zero-trust architecture assumes that no user or device is trusted by default. This means that all users and devices must be authenticated and authorized before they are allowed access to your systems.
* **Educate your employees about supply chain attacks.** Make sure your employees are aware of the risks of supply chain attacks and how to protect themselves. Train them on how to identify and report suspicious activity.

By following these steps, you can help protect yourself from a supply chain attack.

Here are some additional tips:

* Use a secure software development life cycle (SDLC). A secure SDLC includes security measures throughout the software development process, from requirements gathering to deployment.
* Implement security controls in your software supply chain. These controls can help to detect and prevent malicious activity.
* Monitor your software supply chain for threats. This includes monitoring for vulnerabilities, misconfigurations, and suspicious activity.
* Have a plan for responding to a supply chain attack. This plan should include steps for identifying and containing the attack, as well as steps for recovering from the attack.

By following these tips, you can help to protect your organization from supply chain attacks.