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Microsoft Teams services forwarding to untrusted domain

Medium

Synopsis

A number of subdomains of teams.microsoft.com were forwarding to invalidlearningpath.com, a domain which at the time was available for purchase.

     

A malicious attacker could purchase the domain and use this to trick unsuspecting users into visiting a malicious site, leveraging the trust inherent in the teams.microsoft.com domain.

The domain was purchased by a researcher at Tenable when the issue was discovered.

Solution

Microsoft has fixed the issue. The affected subdomains no longer forward to invalidlearningpath.com

Disclosure Timeline

March 2, 2021 - Tenable discovers issue, purchases invalidlearningpath.com
March 4, 2021 - Issue reported to MSRC
March 10, 2021 - Issue fixed by Microsoft

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

Tenable Advisory ID: TRA-2021-09
Credit:
Evan Grant
CVSSv2 Base / Temporal Score:
4.3
CVSSv2 Vector:
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSSv3 Base / Temporal Score:
4.3
CVSSv3 Vector:
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Affected Products:
Microsoft Teams subdomains
Risk Factor:
Medium

Advisory Timeline

March 12, 2021 - Initial Release