noreply • November 22, 2022

MadPCRepairMobile LLC

Microsoft patches Windows DogWalk zero-day exploited in attacks

By Sergiu Gatlan

Microsoft has released security updates to address a high severity Windows zero-day vulnerability with publicly available exploit code and abused in attacks.

Fixed as part of the August 2022 Patch Tuesday, this security flaw is now tracked CVE-2022-34713 and has been jokingly named  DogWalk.

It is due to a path traversal weakness in the Windows Support Diagnostic Tool (MSDT) that attackers can exploit to gain remote code execution on compromised systems.

They can do that by adding maliciously crafted executables to the Windows Startup when the target opens a maliciously crafted .diagcab file (received via email or downloaded from the web).

The planted executables would then automatically be executed the next time the victims restart their Windows device to perform various tasks such as downloading additional malware payloads.

DogWalk  was publicly  disclosed  by security researcher  Imre Rad  more than two years ago, in January 2020, after Microsoft replied to his report saying it won't provide a fix because this isn't a security issue. 

However, the Microsoft Support Diagnostics Tool bug was recently re-discovered and brought back to  public attention  by security researcher  j00sean.

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