Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Cloud

1/30/2020
05:45 PM
Connect Directly
Twitter
LinkedIn
RSS
E-Mail
50%
50%

Two Vulnerabilities Found in Microsoft Azure Infrastructure

Researchers detail the process of finding two flaws in the Azure Stack architecture and Azure App Service, both of which have been patched.

Check Point Research analysts who discovered two vulnerabilities in the Microsoft Azure cloud infrastructure have published the details of how these flaws were found and how attackers could potentially use them.

The research team began exploring Azure infrastructure in an effort "to disprove the assumption that cloud infrastructures are secure," says security researcher Ronen Shustin in a blog post. Check Point informed Microsoft of the vulnerabilities as they were discovered throughout 2019; security patches were deployed for both flaws by the end of the year.

CVE-2019-1234 is a server-side request forgery bug in an on-prem Azure environment called Azure Stack, a hybrid cloud tool for enterprise use. A spoofing flaw exists when Azure Stack fails to validate certain requests. Attackers could exploit this by sending a crafted request to the Azure Stack portal; if successful, they could make requests to internal Azure Stack resources.

Researchers conducted this investigation by first installing the Azure Stack Development Kit (ASDK) on their own servers and mapping areas they thought they might find vulnerabilities. ASDK comes with a set of core components that can be extended via features like App Service and SQL Providers, among others. It has a limited number of features compared to the Azure cloud and usually runs software that's a couple of versions behind, researchers explain. Azure Stack shares similar features with the Azure public cloud, so they focused on those vectors.

One Azure Stack service they investigated was called DataService, which didn't require any authentication. This flaw could enable an attacker to obtain sensitive data belonging to any business with its machine running on Azure, whether it's on a shared or isolated machine. They would first have to gain access to Azure Stack Portal and then send unauthenticated HTTP requests, which could provide screenshots and data about the tenants and infrastructure machines.

This vulnerability is only valid to the Azure Stack, which is also "a very valid attack vector," said Yaniv Balmas, head of security research, in a meeting with reporters at last week's CPX 360 event. "Practically, if someone has a big Azure Stack with a lot of tenants, I can take screenshots of other machines. It could be dangerous; it could not be. It depends."

Remote code execution vulnerability CVE-2019-1372 is in Azure App Service, which lets users build and host Web apps, mobile backends, and restful APIs in a programming language they choose without managing infrastructure. The bug exists when Azure Stack fails to check the length of a buffer before copying memory to it. An attacker could let an unprivileged function, run by the user, execute code in the context of NT AUTHORITY/system and escape the sandbox.

Attackers could use this vulnerability to compromise tenant applications, data, and accounts by creating a free user in the Azure Cloud and running malicious Azure functions. Alternatively, they could send unauthenticated HTTP requests to the Azure Stack user portal. If successful, they could potentially take control over the entire Azure server and the business code it holds.

"[This] can give complete visibility into every workload running on the same server," said Balmas. "[I] can modify them, I can delete them, I can do whatever I want."

In its research, Check Point only used this vulnerability to demonstrate how it could be exploited to crash the Dynamic WAS Service (DWASSVC). However, it could also be used for privilege escalation, they explain in a blog post about CVE-2019-1372.

Related Content:

Check out The Edge, Dark Reading's new section for features, threat data, and in-depth perspectives. Today's top story: "7 Steps to IoT Security in 2020."

Kelly Sheridan is the Staff Editor at Dark Reading, where she focuses on cybersecurity news and analysis. She is a business technology journalist who previously reported for InformationWeek, where she covered Microsoft, and Insurance & Technology, where she covered financial ... View Full Bio
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
dendavis15012
50%
50%
dendavis15012,
User Rank: Apprentice
1/31/2020 | 10:59:51 AM
Re: More worried about *1372
These vulnerabilities should be addressed as soon as possible. 
Overcoming the Challenge of Shorter Certificate Lifespans
Mike Cooper, Founder & CEO of Revocent,  10/15/2020
US Counterintelligence Director & Fmr. Europol Leader Talk Election Security
Kelly Sheridan, Staff Editor, Dark Reading,  10/16/2020
7 Tips for Choosing Security Metrics That Matter
Ericka Chickowski, Contributing Writer,  10/19/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Special Report: Computing's New Normal
This special report examines how IT security organizations have adapted to the "new normal" of computing and what the long-term effects will be. Read it and get a unique set of perspectives on issues ranging from new threats & vulnerabilities as a result of remote working to how enterprise security strategy will be affected long term.
Flash Poll
How IT Security Organizations are Attacking the Cybersecurity Problem
How IT Security Organizations are Attacking the Cybersecurity Problem
The COVID-19 pandemic turned the world -- and enterprise computing -- on end. Here's a look at how cybersecurity teams are retrenching their defense strategies, rebuilding their teams, and selecting new technologies to stop the oncoming rise of online attacks.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-26895
PUBLISHED: 2020-10-21
Prior to 0.10.0-beta, LND (Lightning Network Daemon) would have accepted a counterparty high-S signature and broadcast tx-relay invalid local commitment/HTLC transactions. This can be exploited by any peer with an open channel regardless of the victim situation (e.g., routing node, payment-receiver,...
CVE-2020-26896
PUBLISHED: 2020-10-21
Prior to 0.11.0-beta, LND (Lightning Network Daemon) had a vulnerability in its invoice database. While claiming on-chain a received HTLC output, it didn't verify that the corresponding outgoing off-chain HTLC was already settled before releasing the preimage. In the case of a hash-and-amount collis...
CVE-2020-5790
PUBLISHED: 2020-10-20
Cross-site request forgery in Nagios XI 5.7.3 allows a remote attacker to perform sensitive application actions by tricking legitimate users into clicking a crafted link.
CVE-2020-5791
PUBLISHED: 2020-10-20
Improper neutralization of special elements used in an OS command in Nagios XI 5.7.3 allows a remote, authenticated admin user to execute operating system commands with the privileges of the apache user.
CVE-2020-5792
PUBLISHED: 2020-10-20
Improper neutralization of argument delimiters in a command in Nagios XI 5.7.3 allows a remote, authenticated admin user to write to arbitrary files and ultimately execute code with the privileges of the apache user.