Microsoft Office up to 2019 JavaScript input validation

Summaryinfo

A vulnerability was found in Microsoft Office 365 ProPlus/2013 RT SP1/2013 SP1/2016/2019. It has been classified as critical. This vulnerability affects unknown code of the component JavaScript Handler. This manipulation causes input validation. The identification of this vulnerability is CVE-2019-1109. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in Microsoft Office 365 ProPlus/2013 RT SP1/2013 SP1/2016/2019 (Office Suite Software) and classified as critical. Affected by this vulnerability is an unknown code block of the component JavaScript Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A spoofing vulnerability exists when Microsoft Office Javascript does not check the validity of the web page making a request to Office documents.An attacker who successfully exploited this vulnerability could read or write information in Office documents.The security update addresses the vulnerability by correcting the way that Microsoft Office Javascript verifies trusted web pages., aka 'Microsoft Office Spoofing Vulnerability'.

The weakness was shared 07/09/2019 as confirmed security update guide (Website). The advisory is shared at portal.msrc.microsoft.com. The vendor cooperated in the coordination of the public release. This vulnerability is known as CVE-2019-1109 since 11/26/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The advisory points out:

A spoofing vulnerability exists when Microsoft Office Javascript does not check the validity of the web page making a request to Office documents.

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Office Suite Software

Vendor

• Microsoft

Name

• Office

Version

• 365 ProPlus
• 2013 RT SP1
• 2013 SP1
• 2016
• 2019

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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