What is a Zero-day vulnerability?
A zero-day vulnerability is explained as an unknown flaw which can be occurred when developer created the software. The term zero-day refers to as the developers have zero-day to fix the loophole or else the hackers can have the access and exploit the situation. If the developer fails to fix the problem there can be a zero-day attack.
This is an excellent opportunity for the hackers, with the loophole unrepaired the hacker can attack which can vary from malware, spyware or restricted information access.
How does it possess risk?
Hackers are on edge to crack open vulnerability in the computer system. The security weakness allows to compromise the computer system with malicious software or cause the unintended behavior to occur in the software. If the hacker gets away from the system, it could get the system infected with virus or malware or take an unauthorized control of the computer. It can also sneak out data which is under strict surveillance.
For everyday computer/phone user, a zero-day exploit can be harmful to the system or corrupt files, including the transferring data, opening a web browser, downloading files from unknown source.
A zero-day attack is a serious threat to the web security resulting in potential damage to your computer data. The first line of defense is to be aware of all possible threats, web security such as anti-virus to protect against malicious virus attack is an excellent choice for such attacks. The second line of defense is responding to a threat. Software updates, installing a newer version of the operating system which can be helping in fixing bugs, removing outdated features increases the better performance of the operating system.
Zeus and Heartbleed vulnerability
Among all the known and unknown computer threat of zero-day exploits; Zeus and Heartbleed vulnerability are the most known to the humankind. The Heartbleed bug is a serious vulnerability in the popular OpenSSL cryptographic software library. This loophole allows stealing the secret information under normal conditions which are used to encrypt for secured internet use. The SSL provides communication security and privacy over internet bound applications such as email, instant messaging and other virtual private networks. In a simpler language, the bug allows anyone on the internet to read into your system memory, compromising with data encryption, web traffic, passwords, and logins.
While on other hand Zeus is a malware-based threat runs on Microsoft Windows. It is mainly used to make malicious and criminal tasks such as bank fraud, money laundering, etc. Zeus is mainly spread through downloads and phishing acts. It has exploited much-renowned companies such as Bank of America, Amazon, NASA, etc. Zeus tricks victims into opening pop-up messages which are loaded with a malicious threat. A single click allows the hacker to either spread a malicious malware attack or steal the information needed.