DIscovered by Google's Threat Analysis Group (TAG), the four vulnerabilities in Google Chrome, Internet Explorer, and WebKit, the browser engine used by Apple's Safari, were used as a part of three different campaigns.
“We assess three of these exploits were developed by the same commercial surveillance company that sold these capabilities to two different government-backed actors,” share TAG members Maddie Stone and Clement Lecigne.
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In addition to breaking down the vulnerabilities, the researchers also note that there has been a definite increase in the number of attacks based on zero-day exploits.
So far this year there have been 33 publicly disclosed zero-day exploits used in attacks that have been publicly disclosed this year, share the researchers. To put it into perspective, a grand total of 22 were discovered in the whole of 2020.
However, the marked increase could just be a sign of vendors being more forthcoming about disclosing zero-day vulnerabilities and exploits in their products.
Interestingly, the researchers note that even a genuine increase in the number of zero-day exploits isn’t always a bad thing. They reason that it is the maturing of security products that can thwart most attempts to install malware on a victim’s computer, which is forcing threat actors to rely on zero-day vulnerabilities for conducting attacks.
They also note that until the last decade, only selection nation states had the technical expertise to detect and weaponize zero-day vulnerabilities.
However, leaning on the example of the four vulnerabilities discussed in their post, the researchers argue that these days a majority of the zero-days vulnerabilities are discovered and exploited by private players who then hawk them to state-sponsored actors for their malicious activities.
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