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CISAnalyis 18 July 2022

CVE-2022-22047, an actively exploited zero-day affecting a range of Microsoft Windows and Windows Server versions, was added to CISA’s Known Exploited Vulnerabilities list with an order to all US agencies to patch by the 2nd of August.

Understandably, there’s a dearth of information regarding this new vulnerability’s scope and use cases, but Microsoft released a patch along with 83 others in their July 2022 Patch Tuesday update.

What we do know is that CVE-2022-22047 is an elevation of privilege bug in Windows’ Client/Server Runtime Subsystem (CSRSS). It was given a CVSSv3 score of 7.8 and a rating of Important. If exploited, the vulnerability gives SYSTEM privileges, allowing an attacker full control of a Microsoft endpoint.

Given the potential repercussions of this exploit, one might wonder why it hasn’t been deemed critical. According to Mike Walters of Action1, it can only be executed locally. But he also adds that “vulnerabilities of this type are great for taking control over a workstation or server when they are paired with phishing attacks that use Office documents with macros. This vulnerability can likely be paired with Follina to gain full control over a Windows endpoint.”

On 11 July 2022, Microsoft also released an article stating that VBA macros from the internet will be blocked by default.

#cisa_analysis #vicarius_blog

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