Security restrictions bypass in Microsoft Edge

1) Security restrictions bypass

EUVDB-ID: #VU10652

Risk: Medium

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: N/A

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists in Arbitrary Code Guard (ACG) technology for Windows 10 Creators Update due to an error when data is writtent in the process of content during Just-in-time compilation. A remote attacker can compromise the content process that allows to predict on which address JIT process is going to call VirtualAllocEx() next, unmap the shared memory mapped above using UnmapViewOfFile(), allocate a writable memory region on the same address JIT server is going to write and write a soon-to-be-executable payload there and cause the memory protection to be set to PAGE_EXECUTE_READ when JIT process calls VirtualAllocEx().

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Edge: All versions

CPE2.3

• cpe:2.3:a:microsoft:edge:*:*:*:*:*:*:*:*

External links

https://bugs.chromium.org/p/project-zero/issues/detail?id=1435

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.