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CVE-2023-36884 – OFFICE AND WINDOWS HTML REMOTE CODE EXECUTION VULNERABILITY
July 14, 2023 KS Threat Research Security Advisory Leave a comment
Written by Yann Lehmann and Harish Segar of the Kudelski Security Threat
Detection & Research Team
--------------------------------------------------------------------------------
SUMMARY
On July 11th, Microsoft disclosed a remote code execution (RCE) vulnerability
affecting Windows and Office product, CVE-2023-36884, with a CVSS score of 8.3.
At the time of writing the vulnerability is unpatched, exploited and Microsoft
is investigating the next steps.
Microsoft reads, “An attacker could create a specially crafted Microsoft Office
document that enables them to perform remote code execution in the context of
the victim. However, an attacker would have to convince the victim to open the
malicious file.“
This implies that user interaction is required before the RCE. Also, Crowdstrike
confirmed that they have detection and prevention logic that targets those
behaviours and Microsoft stated that customers with Microsoft Defender for
Office are protected from attachments that attempt to exploit this
vulnerability.
AFFECTED APPLICATIONS
Microsoft suggested that the following applications would be impacted:
* Excel.exe
* Graph.exe
* MSAccess.exe
* MSPub.exe
* Powerpnt.exe
* Visio.exe
* WinProj.exe
* WinWord.exe
* Wordpad.exe
TECHNICAL DETAILS
The technical details of the vulnerability are not extremely detailed publicly
but they leverage an abuse of URL handlers native to Microsoft Windows by
crafting specific documents from the list of affected applications.
TEMPORARY WORKAROUNDS AND MITIGATIONS
Microsoft recommends the following workarounds. While these compensating
controls can mitigate exploitation, they could also affect regular functionality
for certain use cases related to these applications. Therefore, it’s important
to test before deploying changes widely.
* Leverage attack surface reduction rule to block all office applications from
creating child processes
* Set the FEATURE_BLOCK_CROSS_PROTOCOL_FILE_NAVIGATION registry key to 1 for
the affected applications to avoid exploitation.
You can use the following PowerShell code to edit the registry keys.
$registryPath = "HKLM:\SOFTWARE\Policies\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BLOCK_CROSS_PROTOCOL_FILE_NAVIGATION"
$applications = @("Excel.exe", "Graph.exe", "MSAccess.exe", "MSPub.exe", "PowerPnt.exe", "Visio.exe", "WinProj.exe", "WinWord.exe", "Wordpad.exe")
if (!(Test-Path -Path $registryPath)) {
New-Item -Path $registryPath -Force | Out-Null
}
foreach ($app in $applications) {
Set-ItemProperty -Path $registryPath -Name $app -Value 1 -Type DWord
}
Because user interaction is required, the best is to raise awareness of your
users towards that risk, so they do not interact with malicious samples.
DETECTION GUIDANCE
The earliest samples were writing Word documents to disk with a .url extension,
which can be used because it is uncommon.
Observations showed that fully exploited payloads were also writing strange RTF,
CHM or ZIP files to disk which can also be hunted on.
WHAT THE CYBER FUSION CENTER (CFC) IS DOING
The CFC is investigating the possibility of a threat hunting campaign to
identify successful exploitation of this vulnerability, using internal queries
and methodology available for our clients. You will see it appear in your
customer portal as soon as it is launched.
SOURCES
* https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36884
* https://www.reddit.com/r/crowdstrike/comments/14y1yei/20230712_situational_awareness_microsoft_office/
* https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/attack-surface-reduction-rules-reference?view=o365-worldwide#block-all-office-applications-from-creating-child-processes
* https://www.microsoft.com/en-us/security/blog/2023/07/11/storm-0978-attacks-reveal-financial-and-espionage-motives/
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CATEGORIES
Categories Select Category AI (5) Audit (2) Authentication (1)
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