A vulnerability was found in Microsoft Dynamics 365 8. It has been declared as critical. Affected by this vulnerability is an unknown functionality. The manipulation as part of a Web Request 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 remote code execution vulnerability exists in Microsoft Dynamics 365 (on-premises) version 8 when the server fails to properly sanitize web requests to an affected Dynamics server, aka "Microsoft Dynamics 365 (on-premises) version 8 Remote Code Execution Vulnerability." This affects Microsoft Dynamics 365.

The bug was discovered 11/06/2018. The weakness was shared 11/13/2018 with Microsoft as confirmed security update guide (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The vendor cooperated in the coordination of the public release. This vulnerability is known as CVE-2018-8609 since 03/14/2018. The exploitation appears to be easy. The attack can be launched remotely. The successful exploitation needs a single authentication. The technical details are unknown and an exploit is not publicly available. The advisory points out:

A remote code execution vulnerability exists in Microsoft Dynamics 365 (on-premises) version 8 when the server fails to properly sanitize web requests to an affected Dynamics server. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SQL service account. An authenticated attacker could exploit this vulnerability by sending a specially crafted request to a vulnerable Dynamics server. The security update addresses the vulnerability by correcting how Microsoft Dynamics 365 (on-premises) version 8 validates and sanitizes user input.

The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $5k-$25k.

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

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• Microsoft

Name

• Dynamics 365

Version

• 8

License

• commercial

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