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Hacker Discloses 3 Microsoft Unpatched 0day Exploits

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Hacker Discloses 3 Microsoft Unpatched 0day Exploits

The anonymous hacker going by online alias “SandboxEscaper” has now dropped new exploits for two more unpatched Microsoft zero-day vulnerabilities.

While releasing a Windows 10 zero-day exploit for a local privilege escalation bug in Task Scheduler utility, SandboxEscaper claimed to have discovered four more zero-day bugs, exploits for two has now been publicly released.


Microsoft zero-day vulnerabilities resides in the Windows Error Reporting service that can be exploited using a discretionary access control list (DACL) operation.

Dubbed AngryPolarBearBug2 by the hacker, the vulnerability is a successor to a previous Windows Error Reporting service vulnerability she found late last year, which was named AngryPolarBearBug and allowed a local, unprivileged attacker to overwrite any chosen file on the system.

Internet Explorer 11 Sandbox Bypass

The second Microsoft zero-day vulnerability revealed today by SandboxEscaper affects Microsoft’s web browser, Internet Explorer 11 (IE11).

The exploit note doesn’t contain any detail about this flaw, a video demonstration released by the hacker shows the vulnerability exists due to an error when the vulnerable browser handles a maliciously crafted DLL file.

Microsoft representatives have yet to comment on the disclosures this week, and researchers have yet to confirm the two exploits published Wednesday work against fully-patched Windows 10. Given SandboxEscaper’s track record, people should assume the exploits work as billed and stay apprised of any new updates or bulletins that may be published in the coming days.

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