BITS Persistence for Script Kiddies

June 29, 2021

Introduction Using and abusing the BITS service is a lot of fun. I can’t believe Windows just gives away this hacker tool for free. But wait, wait, are you telling me that there’s more? Does it come with a free blender? What else can this service do for me? In the last installment, we covered…

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Simple Data Exfiltration Through XSS

May 11, 2021

During a recent engagement, I found a cross-site scripting (XSS) vulnerability in a legal document management application and created a quick and dirty document exfiltration payload. Unfortunately, this discovery and coding happened on the final day of the engagement (*cough* reporting bonus hacking day), and I didn’t have a chance to actually put the exfiltrated…

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More Options for Response Modification -With ResponseTinker

March 25, 2021

As the web application footprint migrates client-side, tools to thoroughly analyze and test client behavior are becoming increasingly important. Burp Suite has made some great strides in this direction with their browser-based enhancements to crawling and scanning, but when it comes time to really dig into the particulars for research, we are still very much…

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What Spring Data can teach us about API misconfiguration

January 22, 2021

A security researcher (Joel Noguera @niemand_sec) discovered a ‘critical’ misconfiguration bug in Spring Data’s Application Level Profile Semantics (ALPS). This bug allows unauthenticated users to perform an Application Programming Interface (API) request, which responds with sensitive user data that can be utilized, manipulated, or even deleted. What is ALPS? “ALPS [is] a data format for defining…

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Intro to Web App Security Testing: Logging

October 1, 2020

A Brief Look at Approaches to Logging and Pitfalls to Avoid TL;DR The Logger++ extension is a great tool for recording requests and responses across all of Burp Suite. However, it is important to ensure enough log entries are retained from the tools you expect and that logs are exported if you want to keep…

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Setting the ‘Referer’ Header Using JavaScript

September 29, 2020

Or, “I’m Sorry, You Said You’re from Where Again?” In a prior webinar on creating weaponized Cross-Site Scripting (XSS) payloads, I mentioned that XSS payloads (written in JavaScript) could not change the HTTP Referer header. Malicious requests made through an XSS payload will often have an unexpected Referer header that does not generally make sense…

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Azure Account Hijacking using mimikatz’s lsadump::setntlm

September 23, 2020

Not long ago, I was on an engagement where the client made use of a hybrid Office 365 environment. In their setup, authentication credentials were managed by the on-premises Active Directory (AD) Domain Controller and then synced to Azure AD via Azure AD Connect. We were tasked with gaining access to sensitive customer information. And…

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Fuzzing the Front End!

September 8, 2020

So, who is testing the client-side components of Single Page Applications (SPAs)? What are you doing exactly, dropping a few cross-site scripting (XSS) polyglots into boxes like you used to do with “<ScRiPt>alert(123)</sCrIpT>” for traditional apps back in 2001?  Are you mostly holding out hope that all big problems will be in the back-end APIs?…

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So, You Got Access to a *nix system… Now What?

September 1, 2020

Note to Reader: For simplicity, I will be referring to all Unix, Linux, and other Unix-like systems simply as *nix, unless a specific distinction needs to be made. As a pentester, you will likely come across a *nix system at some point. If you are like many of the people I have worked with and…

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A Discussion on Serverless Application Vulnerabilities

August 6, 2020

The main advantage of utilizing serverless architecture, such as Amazon Web Services (AWS), is that it is a great way to build applications without having to manage the infrastructure. The provider will provision, scale, and maintain the servers to run applications, databases, and storage systems. Naturally, this offloads the risk of server-side insecurities to the…

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