![]() ![]() ![]() Three notable SMB vulnerabilities - EternalBlue, EternalRomance, and EternalChampion - made headlines when a hacker group called The Shadow Brokers released a collection of vulnerabilities that they claimed to have stolen from Equation Group, which is suspected by many to be part of the U.S. Because SMB is often part of an intranet, attackers will use various techniques to get through defenses in an attempt to exploit SMB. With EternalBlue specifically, the entire system, and potentially even the network it resides on, may become compromised. ![]() Successful exploitation can have a range of consequences. In addition, other vulnerabilities may exist in more modern versions of SMB, and attackers are continually trying to find ones they can exploit. While outdated and disabled by default in newer operating systems, enough legacy machines are out there to make exploits against SMB v1 still worth the effort. One such vulnerability, EternalBlue, made the news in 2017, and attempts (and possibly successes) in exploiting this vulnerability continue to this day. Several vulnerabilities exist and are exploited in the wild against the SMB protocol and its implementations. For example, in a recent analysis of attacks over a three-month period, Barracuda researchers found that 91.88% of the attacks on port 445 (the most common SMB port) attempted to use the EternalBlue exploit. Further, newer vulnerabilities have been found that make this protocol a viable target for attackers. When systems support these older versions of the protocol, they can be susceptible to attacks that exploit these vulnerabilities. This backwards compatibility is significant because older versions of the protocol, especially SMB v1, have been found over the years to have serious vulnerabilities. While the current version of the protocol is 3.1.1, backwards compatibility remains a feature in even modern Windows systems, which was enabled by default for years. The Server Message Block (SMB) protocol facilitates shared access to files and printers, and it has been widely used on Windows systems for years, as well as on Linux and Apple systems connecting to networks utilizing SMB. ![]()
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