Dynamics 365 8.2.6 Security Vulnerability

CVE-2019-1008 | Microsoft Dynamics On-Premise Security Feature Bypass
Security Vulnerability
Published: 05/14/2019
MITRE CVE-2019-1008

Microsoft Dynamics is prone to a security-bypass vulnerability. An attacker can exploit this issue to bypass certain security restrictions and perform unauthorized actions.

A security feature bypass vulnerability exists in Dynamics On Premise. An attacker who exploited the vulnerability could send attachment types that are blocked by the email attachment system. To exploit the vulnerability, an attacker would need to capture and edit the POST request to include a special character in the extension. The update addresses the vulnerability by blocking files with the special character in the file extension.

Microsoft has not identified any mitigating factors for this vulnerability.
Microsoft has not identified any workarounds for this vulnerability.

Recommendations:
Permit local access for trusted individuals only. Where possible, use restricted environments and restricted shells.
To exploit this vulnerability, an attacker requires local access to an affected computer. Grant local access for trusted and accountable users only.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity such as unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.
Updates are available. Please see the references or vendor advisory for more information.

References:
Microsoft: https://support.microsoft.com/en-us/help/4494412/security-dynamics-365-on-premises-update-2-6
Symantec: https://www.symantec.com/security-center/vulnerabilities/writeup/108309

The fix would be to update to 8.2.6.

We recommend performing the upgrade in the test environment and perform functional testing, prior to upgrading in Prod.