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Home > Cybersecurity > New vulnerabilities found in Microsoft Azure

New vulnerabilities found in Microsoft Azure

Intezer announced that they have discovered two vulnerabilities in Azure App Services, impacting Linux servers.

Erdem Yasar by Erdem Yasar
October 9, 2020
in Cloud Computing, Cybersecurity
2 min read
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Intezer announced that the company discovered two vulnerabilities in Microsoft Azure. According to the announcement, vulnerabilities exist in Azure App Services and specifically impacts Linux servers. App Services’ administration page is provided by a Microsoft open-source project called Kudu. For Linux, it’s a lesser-known project called KuduLite.

Vulnerability 1: KuduLite Takeover/EoP

Intezer noticed that the application node’s SSH service uses hardcoded credentials “root:Docker!” to access the application node when investigating webssh connection. The application node’s SSH port is not accessible from the internet so it poses no danger. However, Intezer noticed that earlier the KuduLite instance also ran SSH. Thus when they used the same credentials on the KuduLite instance and they were able to log in as root. It grants complete control over the SCM web server. It also allows listening to HTTP requests to the SCM web page, adding pages, and injecting malicious Javascript into the user’s web page.

Vulnerability 2: Lack of Access Checks in KuduLite

The second vulnerability was found in the KuduLite API. Intezer discovered that the application node sends requests to the KuduLite API without requiring any access validation. This can allow an attacker who manages to forge a GET request accessing the application node’s file system. Thus, the attacker can steal source code and other assets. It also allows forging a POST request to achieve remote code execution on the application node.

Intezer team also stated that,

“Finally, these two vulnerabilities can be chained together, since once an attacker achieves code execution with the second vulnerability, provided they have an SSRF vulnerability, they can exploit the first one. We reached out to Microsoft with our findings as part of the responsive disclosure process and the vulnerabilities were quickly acknowledged and fixed.”

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Tags: Microsoft AzureVulnerability
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Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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