Microsoft Excel CVE-2018-0920 Remote Code Execution

Authors:Kaspersky/360          Risk:High
 
CVE:CVE-2018-0920             0day:Remote Code Execution  

0day-id:0DAY-0920              Date:2018-04-12

Description

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.

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.

The security update addresses the vulnerability by correcting how Microsoft Excel handles objects in memory.

Exploitability Assessment

The following table provides an exploitability assessment for this vulnerability at the time of original publication.

Publicly Disclosed Exploited Latest Software Release Older Software Release Denial of Service
No No 1 – Exploitation More Likely 1 – Exploitation More Likely Not Applicable

Affected Products

The following software versions or editions are affected. Versions or editions that are not listed are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see the Microsoft Support Lifecycle.

Product
Platform
Article
Download
Impact
Severity
Supersedence
Microsoft Excel 2010 Service Pack 2 (32-bit editions) 4018362 Security Update Remote Code Execution Important 4011675
Microsoft Excel 2010 Service Pack 2 (64-bit editions) 4018362 Security Update Remote Code Execution Important 4011675

Mitigations

Microsoft has not identified any mitigating factors for this vulnerability.

 

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Acknowledgements

Vladislav Stolyarov of Kaspersky Lab

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