For enterprises using Windows Server, the update brings new Windows Server containers including support for Windows Server containers in Kubernetes. Bad actors cannot use LPE's to access a system, but they can elevate access once a host has been compromised. In lack of a DACL, the system grants any user full access to the file. If you recall, SandboxEscaper doesn't think too highly Microsoft and has published other zero-day vulnerabilities affecting the company's software dating back to the summer of 2018.
You may see this screen when you visit the Windows Update screen and have the May 2019 Update waiting for you.
If you don't opt for the download, it's a good idea to review our tutorial on how to manage Windows updates. As Windows restarts, the system restore process should resume and finish. To prove the validity of her work, she shared a video showing the PoC in action on Windows x86. Apparently, the exploit has serious security implications in Windows 10.
"The exploit calls the code once, deletes the file, and then calls it again with an NTFS hard link pointing to the file that gets permissions clobbered with SetSecurityInfo ()", the security professional told BleepingComputer.
This latest one works by abusing Windows' schtasks tool, created to run programs at scheduled times, along with quirks in the operating system. Three of them being local privilege escalation (LPE) vulnerabilities leading to code execution and fourth that is a sandbox escape.
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He added, "It would be a lofty goal to say we're following in their footsteps, but certainly we're taking inspiration from that". Rather than shop that IP out to other studios, Layden says that it's better to, "develop and produce for ourselves".
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The hacker, SandboxEscaper, has released the exploit on GitHub and is known not to warn Microsoft first.
She's also rather peeved at the West and society in general, and hopes to sell some of her exploits to non-Western miscreants, though she did not specify a currency: "If any non-western people want to buy LPEs, let me know".
The researcher named this bug "AngryPolarBearBug2" after a similar zero-day she discovered in the same Windows Error Reporting service last December, and named "AngryPolarBearBug". Won't sell for less then 60k for an LPE.
And it will likely be patching more still - SandboxEscaper apparently has more zero-days up her sleeve aside from this latest vulnerability: "I have four more unpatched bugs where that one came from".