Multiple vulnerabilities in Microsoft Excel



Published: 2021-01-12
Risk High
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2021-1713
CVE-2021-1714
CWE ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Microsoft Office
Client/Desktop applications / Office applications

Microsoft Excel
Client/Desktop applications / Office applications

Excel Services on Microsoft SharePoint Server
Client/Desktop applications / Office applications

Office Online Server
Server applications / Other server solutions

Microsoft Office Web Apps Server
Server applications / Application servers

Microsoft SharePoint Server
Server applications / Application servers

Vendor Microsoft

Security Advisory

1) Input validation error

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-2021-1713

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in Microsoft Excel. A remote attacker can pass specially crafted input to the application and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2019, 2019 for Mac

Office Online Server : 2016

Microsoft Excel: 2010, 2013, 2013 RT Service Pack 1, 2016

Microsoft Office Web Apps Server: 2013 Service Pack 1

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1713

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 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.

2) Input validation error

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-2021-1714

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in Microsoft Excel. A remote attacker can pass specially crafted input to the application and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft SharePoint Server: 2013

Microsoft Office: 2010 Service Pack 2, 2013, 2013 RT, 2016, 2019, 2019 for Mac

Office Online Server : 2016

Microsoft Excel: 2010, 2013, 2013 RT Service Pack 1, 2016

Microsoft Office Web Apps Server: 2013 Service Pack 1

Excel Services on Microsoft SharePoint Server: 2013 Service Pack 1

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1714

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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