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Hacker Leaked New Windows 10 Zero-day Exploit Online To Bypass Already Patched Bug
SanboxEscaper, an anonymous hacker came back and leaked an another Windows zero-day PoC that exploits already patched (CVE-2019-0841) local privilege escalation vulnerability that resides in Windows 10.
This is a second zero-day that bypass CVE-2019-0841, An elevation of privilege vulnerability exists when Windows AppX Deployment Service improperly handles hard links. and the vulnerability has been already patched by Microsoft in April.
SandboxEscaper, a pseudonym of a widely known anonymous hacker who has actively leak windows based zero-day exploit online since August 2018 (1, 2, 3, 4, 5, 6), and this is ninth zero-day leak since August 2018.
An attacker who successfully exploited this vulnerability (CVE-2019-0841) could run processes in an elevated context., In result, threat actor installs malicious programs view, change or delete data.
Exploit The 0day with Edge
SanboxEscaper explains (GitHub repository removed now), the vulnerability can be triggered by deleting all files and subfolders within the location of Edge browser where she pointed below. "c:\\users\\%username%\\appdata\\local\\packages\\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\\" Firstly, we need to perform the deleting process as a local user account. so, when user launch the Edge, it will end up to crash the browser. but, when a local user launches it a second time, it causes to write the Discretionary Access Control List (DACL) while impersonating “SYSTEM.” Arbitrary DACL writes allow a low-privileged user to change the system permissions, eventually gains complete control of the systems admin access.
SandboxEscaper explains the following process via her GitHub repository.
The trick here is to launch edge by clicking it on the taskbar or desktop, using “start microsoft-edge:” seems to result in correct impersonation.\par
You can still do this completely programmatically.. since edge will always be in the same position in the task bar.. *cough* sendinput *cough*. There is probably other ways too.\par \b Another note, this bug is most definitely not restricted to edge. .
Author: Balaji
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