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Category: Security

Accessing Network Shares from SQL Server

Published 2021-09-02 by Kevin Feasel

Daniel Hutmacher engages in chicanery:

Using a local service account for your SQL Server service, your server won’t automatically have permissions to access to other network resources like UNC paths. Most commonly, this is needed to be able to perform backups directly to a network share.

Using a domain account as your SQL Server service account will allow the server to access a network share on the same domain, but if the network share is not on your domain, like an Azure File Share, you need a different solution.

There’s a relatively easy way to make all of this work, though.

Click through to see how, as well as several methods to make it work within SQL Server.

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Github Autopilot and Insecure Code Suggestions

Published 2021-08-30 by Kevin Feasel

Mayank Sharma reviews an article:

Academic researchers discover that nearly 40% of the code suggestions by GitHub’s Copilot tool are erroneous, from a security point of view.

Developed by GitHub in collaboration with OpenAI, and currently in private beta testing, Copilot leverages artificial intelligence (AI) to make relevant coding suggestions to programmers as they write code.

To help quantify the value-add of the system, the academic researchers created 89 different scenarios for Copilot to suggest code for, which produced over 1600 programs. Reviewing them, the researchers discovered that almost 40% were vulnerable in one way or another. 

Click through to learn more, as well as a link to the article itself. I would be interested in reading GitHub’s thoughts on this.

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Connecting to REST APIs via OAuth2 in Power BI

Published 2021-08-30 by Kevin Feasel

Chris Webb has an answer, but you may not like it:

There are a lot of articles and blog posts out there on how to handle OAuth2 authentication when connecting to REST APIs from Power Query in Power BI. However there is also a lot of confusion and contradictory information too so in this post I want to give you the definitive, Microsoft-endorsed answer to this question, which is:

If want to connect from Power BI to a REST API that uses OAuth2 authentication then you need to build a custom connector.

Read on for documentation showing how to implement and the big risk you’re taking if you don’t use a custom connector.

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Security Breach in Cosmos DB: ChaosDB

Published 2021-08-27 by Kevin Feasel

Nir Ohfeld and Sagi Tzadik discovered a flaw in Azure Cosmos DB:

Nearly everything we do online these days runs through applications and databases in the cloud. While leaky storage buckets get a lot of attention, database exposure is the bigger risk for most companies because each one can contain millions or even billions of sensitive records. Every CISO’s nightmare is someone getting their access keys and exfiltrating gigabytes of data in one fell swoop.

So you can imagine our surprise when we were able to gain complete unrestricted access to the accounts and databases of several thousand Microsoft Azure customers, including many Fortune 500 companies. Wiz’s security research team (that’s us) constantly looks for new attack surfaces in the cloud, and two weeks ago we discovered an unprecedented breach that affects Azure’s flagship database service, Cosmos DB.

Read on for details about the attack. Microsoft has already mitigated the issue by disabling the functionality necessary to pull off the attack. H/T Ben Stegink.

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The Cost of a Checkbox: Power Apps Edition

Published 2021-08-24 by Kevin Feasel

Paul Thurrott looks at a security issue:

Over 1000 web apps created with Microsoft’s Power Apps inadvertently exposed the data from over 38 million users thanks to a misconfiguration, according to a new report in Wired. The good news? The issue has been fixed and no customers are known to have been compromised.

“We found [a web app created with Power Apps] that was misconfigured to expose data and we thought, we’ve never heard of this, is this a one-off thing or is this a systemic issue?” UpGuard vice president Greg Pollock told Wired. “Because of the way the Power Apps portals product works, it’s very easy to quickly do a survey. And we discovered there are tons of these exposed. It was wild.”

“Known to have been compromised” probably needs a “yet” in there somewhere. Read the whole thing.

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Kafka and SIEM/SOAR Tools

Published 2021-08-12 by Kevin Feasel

Kai Waehner wraps up a series on Apache Kafka and network security:

SIEM combines security information management (SIM) and security event management (SEM). They provide analysis of security alerts generated by applications and network hardware. Vendors sell SIEM as software, as appliances, or as managed services; these products are also used for logging security data and generating reports for compliance purposes.

SOAR tools automate security incident management investigations via a workflow automation workbook. The cyber intelligence API enables the playbook to automate research related to the ticket (lookup potential phishing URL, suspicious hash, etc.). The first responder determines the criticality of the event. At this level, it is either a normal or an escalation event. SOAR includes security incident response platforms (SIRPs), Security orchestration and automation (SOA), and threat intelligence platforms (TIPs).

In summary, SIEM and SOAR are key pieces of a modern cybersecurity infrastructure. The capabilities, use cases, and architectures are different for every company.

Click through to see where Kafka can fit in all of this.

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Row Level Security in Azure Analysis Services and Power BI PPU

Published 2021-08-11 by Kevin Feasel

Gilbert Quevauvilliers continues a series on moving from Azure Analysis Services to Power BI Premium Per User:

In this blog post I am going to cover how to implement Row Level Security (RSL) when using AAS and how this can be done on PPU.

In my example below I am going to show creating to simple RLS roles which will limit data for the users who belong to 2 roles.

Despite the simplification, we can see how row-level security applies to both products and how the two differ.

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Finding and Removing Custom Roles, Schemas, and Users from a Database

Published 2021-08-05 by Kevin Feasel

Thomas Williams wants to go back to square one:

I’m a fan of the built-in database roles like db_datareader to standardise & simplify permissions (sorry Dr. Greg Low!) and recently I needed to do just that in a database created using SQL Server 2000, and remove old defaults and a lot of custom roles, schemas and users.

I wrote the set of queries below to generate scripts to remove non-built-in roles, schemas and users, when compared to the model database on a new SQL Server 2019 server.

After running the script generated by the queries, I added back users and gave appropriate roles (like db_datareader).

Read on for the script.

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Executing T-SQL with a Proxy Account

Published 2021-08-04 by Kevin Feasel

Tom Collins answers a question:

I have some t-sql code added to a job step on a SQL Server Agent job. The problem is I need to run the code as RUNAS . I though of executing the job with a proxy account – so progressed with the Credential & proxy set up.    But I still can’t view the Proxy\Credential in the RunAs list . Is there a way around this problem?

Read on to learn why and for the answer.

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