Microsoft issues critical Exchange Server patches to thwart wave of targeted attacks

Cyber Security News

Microsoft will release patches Tuesday for 4 critical vulnerabilities Chinese hackers are making use of in specific attacks on Exchange Server.

On a collection of a few web site posts to be launched Tuesday, Microsoft said qualified hacking from a group functioning out of China that the company calls Hafnium, joined jointly chains of vulnerabilities to garner obtain.

“Historically, Hafnium mainly targets entities in the United States for the goal of exfiltrating data from a amount of industry sectors, including infectious illness researchers, legislation companies, better education and learning institutions, defense contractors, policy assume tanks, and NGOs,” Microsoft will say in a website submit that was provided to SC Media in advance of launch.

“While Hafnium is primarily based in China, it conducts its operations primarily from leased virtual private servers (VPS) in the United States.”

Microsoft was fast to warning that this hacking is unrelated to Solarigate.

Vulnerable variations of Trade Server consist of Microsoft Exchange Servers 2013, 2016 and 2019. Microsoft indicates patching these promptly.

The 4 vulnerabilities include things like CVE-2021-26855, a server-facet request forgery vulnerability that allowed Hafnium to manipulate authentication. With that authentication, Hafnium could then use either of two file generate vulnerabilities also patched these days, CVE-2021-26858 and CVE-2021-27065.

The fourth vulnerability, CVE-2021-26857, is an insecure deserialization vulnerability in the Unified Messaging service that authorized the hackers to run code on trade servers, but needed possibly an further vulnerability or an administrator’s authorization to operate.

Microsoft credited Volexity and Dubex for reporting diverse elements of the attack.