Information disclosure in Microsoft Excel



Published: 2021-05-11
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-31174
CWE-ID CWE-125
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Microsoft Office
Client/Desktop applications / Office applications

Microsoft Excel
Client/Desktop applications / Office applications

Office Online Server
Server applications / Other server solutions

Microsoft Office Web Apps Server
Server applications / Application servers

Vendor Microsoft

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Out-of-bounds read

EUVDB-ID: #VU53112

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-31174

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: Yes

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in Microsoft Excel. A local user can trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2013 - 2019

Office Online Server : 2016

Microsoft Excel: 2013 - 2016

Microsoft Office Web Apps Server: 2013 Service Pack 1

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31174


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

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

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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