Microsoft Office 365 ProPlus/2016/2019 Word memory corruption

Summaryinfo

A vulnerability classified as critical was found in Microsoft Office 365 ProPlus/2016/2019. This impacts an unknown function of the component Word. The manipulation results in memory corruption. This vulnerability is reported as CVE-2019-1035. The attack can be launched remotely. No exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability classified as critical has been found in Microsoft Office 365 ProPlus/2016/2019 (Office Suite Software). Affected is an unknown function of the component Word. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A remote code execution vulnerability exists in Microsoft Word software when it fails to properly handle objects in memory, aka 'Microsoft Word Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-1034.

The weakness was disclosed 06/11/2019 as confirmed security update guide (Website). The advisory is shared for download at portal.msrc.microsoft.com. The public release has been coordinated in cooperation with the vendor. This vulnerability is traded as CVE-2019-1035 since 11/26/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The advisory points out:

A remote code execution vulnerability exists in Microsoft Word software when it fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. For example, the file could then take actions on behalf of the logged-on user with the same permissions as the current user.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 110335 (Microsoft Office and Microsoft Office Services and Web Apps Security Update June 2019).

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

The entries VDB-136327, VDB-136328, VDB-136329 and VDB-136330 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Office Suite Software

Vendor

• Microsoft

Name

• Office

Version

• 365 ProPlus
• 2016
• 2019

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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Once again VulDB remains the best source for vulnerability data.

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