Microsoft Office up to 2019 Word memory corruption

Summaryinfo

A vulnerability classified as critical has been found in Microsoft Office 365 ProPlus/2010 SP2/2013 SP1/2016/2019. This affects an unknown function of the component Word. The manipulation leads to memory corruption. This vulnerability is documented as CVE-2019-1034. 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 was found in Microsoft Office 365 ProPlus/2010 SP2/2013 SP1/2016/2019 (Office Suite Software). It has been rated as critical. This issue affects some unknown processing of the component Word. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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-2019-1035.

The weakness was released 06/11/2019 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. The identification of this vulnerability is CVE-2019-1034 since 11/26/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not 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.

Entries connected to this vulnerability are available at VDB-136327, VDB-136328, VDB-136329 and VDB-136330. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Office Suite Software

Vendor

• Microsoft

Name

• Office

Version

• 365 ProPlus
• 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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