Hacking

Microsoft accidentally exposed Dynamics 365 TLS certificates exposing sandbox environments to MiTM attacks

Microsoft accidentally exposed a Dynamics 365 TLS certificate and private key for at least 100 days leaving the sandbox environments open to MiTM attacks.

Data leakage continues to represent a serious problem for organizations, now it’s up to Microsoft that accidentally exposed a Dynamics 365 TLS certificate and private key for at least 100 days.

The software developer Matthias Gliwka discovered the issue while working with the cloud version of the Microsoft ERP system.

Microsoft started offering the ERP product last year, it is SaaS solution hosted in Azure and accessible through a comprehensive control panel (Life Cycle Services).

According to Gliwka, the TLS certificate was exposed in the Dynamics 365 sandbox environment that is used for user acceptance testing (also referred to as “sandbox”) .

The user acceptance system mirrors the setup of the production environment with a single exception, it offers administrative RDP access.

The expert accessed a sandbox environment via RDP to learn how Microsoft would set up a server hosting such a business critical application.

“The hostname for a sandbox environment is customername.sandbox.operations.dynamics.com. A quick glance at the certificates inside the built-in “Certificate Manager” revealed something shocking” wrote Gliwka on Medium.

“Sitting there in plain sight was a valid TLS certificate for the common name *.sandbox.operations.dynamics.com and the corresponding private key — by the courtesy of Microsoft IT SSL SHA2 CA! This certificate is shared across all sandbox environments, even those hosted for other Microsoft customers.”

The certificate is used encrypt the web traffic between the users and the server, extracting the certificate an attacker could s access to any sandbox environment.

Gliwka reported the issue to Microsoft that took time to fix it, then he contacted German tech freelancer Hanno Böck to get coverage.

Böck tried filing a bug ticket with Mozilla’s bug tracker that triggered the Microsoft’s action.

The issue was solved on 5 December, months later it first notification on 17 August.

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Pierluigi Paganini

(Security Affairs – Dynamics 365 sandbox, Data Leakage)

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Pierluigi Paganini

Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer. Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US. Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines. Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.

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