Researchers detail a bug they found in some of Microsoft's OAuth 2.0 applications.

Dark Reading Staff, Dark Reading

December 3, 2019

1 Min Read

Researchers from CyberArk today outlined a vulnerability they discovered this fall in some Microsoft OAuth 2.0 applications that could allow an attacker to hijack Azure accounts. Microsoft fixed the flaw late last month.

The weaknesses lie in OAuth settings in Microsoft's Portfolios, O365 Secure Score, and Microsoft Service Trust applications, and could be abused by an attacker to grab admin accounts and basically "own" Azure accounts. OAuth is a popular authorization protocol that allows users to share information about their accounts among third-party applications and websites.

"The OAuth applications trust domains and sub-domains are not registered by Microsoft, so they can be registered by anyone (including an attacker). These apps are approved by default and are allowed to ask for 'access_token,'" CyberArk said in a blog post about the vuln. "The combination of these two factors makes it possible to produce an action with the user's permissions – including gaining access to Azure resources, AD resources and more."

Read more here.

Edgepromohorizontal.jpgCheck out The Edge, Dark Reading's new section for features, threat data, and in-depth perspectives. Today's top story: "A Cause You Care About Needs Your Cybersecurity Help."

About the Author(s)

Dark Reading Staff

Dark Reading

Dark Reading is a leading cybersecurity media site.

Keep up with the latest cybersecurity threats, newly discovered vulnerabilities, data breach information, and emerging trends. Delivered daily or weekly right to your email inbox.

You May Also Like


More Insights