Multiple vulnerabilities in Microsoft Office



Published: 2021-09-14
Risk High
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2021-38659
CVE-2021-38650
CWE ID CWE-94
CWE-451
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Microsoft 365 Apps for Enterprise
Client/Desktop applications / Other client software

Microsoft Office
Client/Desktop applications / Office applications

Vendor Microsoft

Security Advisory

1) Code Injection

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-38659

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation in Microsoft Office. A remote attacker can execute arbitrary code on the target system.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft 365 Apps for Enterprise: 32-bit Systems, 64-bit Systems

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38659

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.

2) Spoofing attack

Risk: Medium

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-38650

CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data in Microsoft Office. A remote authenticated attacker can spoof page content.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2013, 2013 RT, 2016, 2019, 2019 for Mac

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38650

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open an attachment in an e-mail message.

Is there known malware, which exploits this vulnerability?

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



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