CVE-2020-1335: Microsoft Excel Remote Code Execution Vulnerability
First published: Fri Sep 11 2020(Updated: )
<p>A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.</p> <p>Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Excel. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) containing a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Excel handles objects in memory.</p>
Credit: secure@microsoft.com secure@microsoft.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft 365 Apps | ||
| Microsoft Excel | =2010-sp2 | |
| Microsoft Excel | =2013-sp1 | |
| Microsoft Excel | =2013-sp1 | |
| Microsoft Excel | =2016 | |
| Microsoft Office | =2010-sp2 | |
| Microsoft Office | =2013-sp1 | |
| Microsoft Office | =2013-sp1 | |
| Microsoft Office | =2016 | |
| Microsoft Office | =2019 | |
| Microsoft Office Online Server | =1.0 | |
| Microsoft Office Web Apps | =2013-sp1 | |
| Microsoft SharePoint Server | =2019 |
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Frequently Asked Questions
What is CVE-2020-1335?
CVE-2020-1335 is a remote code execution vulnerability in Microsoft Excel software.
How does the vulnerability in CVE-2020-1335 occur?
The vulnerability occurs when the software fails to properly handle objects in memory.
What is the severity of CVE-2020-1335?
The severity of CVE-2020-1335 is high with a CVSS score of 8.8.
Which software versions are affected by CVE-2020-1335?
Microsoft Excel versions 2010, 2013, 2016, and various versions of Microsoft Office and Office Online Server are affected.
How can I fix CVE-2020-1335?
Microsoft has released a security update to address this vulnerability. It is recommended to install the latest update from Microsoft.
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