Remote code execution in Microsoft Scripting Engine



Published: 2021-07-13
Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-34448
CWE-ID CWE-119
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
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Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Microsoft Internet Explorer
Client/Desktop applications / Web browsers

Vendor Microsoft

Security Bulletin

This security bulletin contains one critical risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU54721

Risk: Critical

CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-34448

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing HTML content in Microsoft scripting engine. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 7, 8.1, 10, 10 20H2, 10 21H1, 10 1507, 10 1511, 10 1607, 10 1703, 10 1709, 10 1803, 10 1809, 10 1903, 10 1909, 10 2004, 10 Gold, 10 Mobile, 10 S, RT 8.1

Windows Server: 2008 R2, 2012, 2012 R2, 2016, 2019, 2019 20H2, 2019 1709, 2019 1803, 2019 1903, 2019 1909, 2019 2004

Microsoft Internet Explorer: 11

CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34448

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?

Yes. This vulnerability is being exploited in the wild.



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