Security restrictions bypass in Windows HTML Platform



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-31971
CWE-ID CWE-264
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Windows Server
Operating systems & Components / Operating system

Windows
Operating systems & Components / Operating system

Microsoft Internet Explorer
Client/Desktop applications / Web browsers

Microsoft Edge
Client/Desktop applications / Web browsers

Vendor Microsoft

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Security restrictins bypass

EUVDB-ID: #VU53914

Risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-31971

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to Windows HTML Platform does not properly impose security restrictions. A remote attacker can create a specially crafted web page, trick the victim into opening it and bypass implemented security restrictions.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows Server: 2008 R2 - 2019 10.0.17763.1

Windows: 7 - 10

Microsoft Internet Explorer: 11

Microsoft Edge: All versions

CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31971


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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



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