Microsoft SharePoint Server 2010 SP2/2013 SP1/2016/2019 Markup Application Package code download

Summaryinfo

A vulnerability was found in Microsoft SharePoint Server 2010 SP2/2013 SP1/2016/2019. It has been classified as critical. This impacts an unknown function of the component Markup Handler. Performing a manipulation as part of Application Package results in code download. This vulnerability is identified as CVE-2020-1453. The attack can be initiated remotely. There is not any exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as critical, was found in Microsoft SharePoint Server 2010 SP2/2013 SP1/2016/2019 (Groupware Software). This affects an unknown code block of the component Markup Handler. The manipulation as part of a Application Package leads to a code download vulnerability. CWE is classifying the issue as CWE-494. The product downloads source code or an executable from a remote location and executes the code without sufficiently verifying the origin and integrity of the code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

<p>A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account.</p> <p>Exploitation of this vulnerability requires that a user uploads a specially crafted SharePoint application package to an affected version of SharePoint.</p> <p>The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages.</p>

The weakness was released 09/08/2020 as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The public release was coordinated with Microsoft. This vulnerability is uniquely identified as CVE-2020-1453. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1495 according to MITRE ATT&CK. The advisory points out:

A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

Entries connected to this vulnerability are available at VDB-160854 and VDB-160850. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Groupware Software

Vendor

• Microsoft

Name

• SharePoint Server

Version

• 2010 SP2
• 2013 SP1
• 2016
• 2019

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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