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Microsoft Confirms Exploitation of Two Trade Server Zero-Days

By Eduard Kovacs on September 30, 2022

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Microsoft has confirmed that it’s conscious of two Trade Server zero-day vulnerabilities which have been exploited in focused assaults. The tech big is engaged on patches.

GTSC, a cybersecurity firm primarily based in Vietnam, reported seeing assaults exploiting two new Microsoft Trade zero-day vulnerabilities. The agency believes the assaults, which had been first seen in August and aimed toward vital infrastructure, had been launched by a Chinese language risk group.

Technical particulars on the vulnerabilities haven’t been made public, however GTSC did say that the risk actor’s post-exploitation actions included the deployment of backdoors, lateral motion, and the supply of malware.

The vulnerabilities had been reported to Microsoft via Development Micro’s Zero Day Initiative (ZDI). Microsoft has now revealed a weblog put up to tell prospects that it’s investigating two reported zero-day flaws.

The tech big says one of many flaws is a server-side request forgery (SSRF) concern tracked as CVE-2022-41040 and the second is a distant code execution vulnerability tracked as CVE-2022-41082. The safety holes have been discovered to impression Trade Server 2013, 2016 and 2019.

“At the moment, Microsoft is conscious of restricted focused assaults utilizing the 2 vulnerabilities to get into customers’ methods. In these assaults, CVE-2022-41040 can allow an authenticated attacker to remotely set off CVE-2022-41082. It ought to be famous that authenticated entry to the susceptible Trade Server is important to efficiently exploit both of the 2 vulnerabilities,” Microsoft mentioned.

The corporate is engaged on an accelerated timeline to patch the vulnerabilities. Within the meantime, it has offered detailed steerage on how exploitation might be prevented. Microsoft says its safety merchandise ought to detect post-exploitation malware and exercise related to these assaults. Microsoft Trade On-line prospects don’t must take any motion.

Safety researcher Kevin Beaumont has named the vulnerabilities ProxyNotShell attributable to similarities with the outdated ProxyShell flaw, which has been exploited within the wild for greater than a yr. The truth is, earlier than Microsoft confirmed the zero-days, Beaumont believed it’d simply be a brand new and more practical variant of the ProxyShell exploit, fairly than an precise new vulnerability.

Different researchers additionally consider the vulnerabilities might be associated to Microsoft not utterly killing ProxyShell.

Associated: Hackers Deploying Backdoors on Trade Servers by way of ProxyShell Vulnerabilities

Associated: Zero-Days Below Assault: Microsoft Plugs Trade Server, Excel Holes

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