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Which of the following BEST describes this type of attack?

An attacker used an undocumented and unknown application exploit to gain access to a file server. Which of
the following BEST describes this type of attack?

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A.
Integer overflow

B.
Cross-site scripting

C.
Zero-day

D.
Session hijacking

E.
XML injection

Explanation:
The vulnerability is undocumented and unknown. This is zero-day vulnerability.
A zero-day vulnerability refers to a hole in software that is unknown to the vendor. This security hole is then
exploited by hackers before the vendor becomes aware and hurries to fix it—this exploit is called a zero-day
attack. Uses of zero day attacks can include infiltrating malware, spyware or allowing unwanted access to user
information. The term “zero day” refers to the unknown nature of the hole to those outside of the hackers,
specifically, the developers. Once the vulnerability becomes known, a race begins for the developer, who must
protect users.

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