JUMPSEC LABS

The JUMPSEC Lab is a place where the the technical team get creative and showcase their latest security research, publications, interesting news and general thoughts!  We love what we do and are passionate about security, with some great upcoming projects planned, bookmark our site and stick around to see what we are working on.

Advisory CVE-2021-41551 Leostream Connection Broker – Authenticated Zip Slip

Software: Leostream Connection BrokerAffected Versions: 9.0.40.17Vendor page: https://leostream.com/CVE Reference: CVE-2021-41551Published: 25/01/2022Attack Vector: path traversal, authenticatedCredits: Andrei Constantin Scutariu, Lenk Ratchakrit Seriamnuai, Andrea Malusardi Summary Leostream Connection Broker 9.0.40.17 allows administrators to conduct directory traversal attacks by uploading a ZIP file that contains a symbolic link. Mitigation The Leostream has released a patch for this vulnerability, JUMPSEC recommend upgrading the affected versions to this new version as soon as possible. Leostream's advice and release notes can be found here. Technical details For achieving local file inclusion, an attacker with administrator access to the application - or access as a custom role allowing TPC uploads - can upload zip files to be extracted in the web server directory. The attackers...

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PowerShell Jobs

JUMPSEC investigators recently observed an adversary weaponising PowerShell Jobs to schedule their attack whilst responding to an incident. We discuss what PowerShell Jobs are, how they can be leveraged for malicious purposes, and how defenders can protect, detect, and respond to neutralise the threat.

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Car Hacking – Manual Bypass of Modern Rolling Code Implementations

Introduction I recently researched modern algorithms used by keyfobs to open cars. Since most of the blogs online talking about the topic are unfortunately quite old and in general and do not precisely describe the exact path followed in detail, nor the code used. I thought that talking about my experience could be interesting and inspiring for other researchers. I won’t go in depth on certain...

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PRINTNIGHTMARE NETWORK ANALYSIS

By Dray Agha The infosec community has been busy dissecting the PrintNightmare exploit. There are now variations of the exploit that can have various impacts on a target machine. When we at JUMPSEC saw that Lares had captured some network traffic of the PrintNightmare exploit in action, I wondered if there was an opportunity to gather network-level IoCs...

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Securing against new offensive techniques abusing active directory certificate service

SpecterOps recently released an offensive security research paper that details techniques enabling an adversary to abuse insecure functionality in Active Directory Certificate Service. SpecterOps reports that abusing the legitimate functionality of Active Directory Certificate Service will allow an adversary to forge the elements of a certificate to authenticate as any user or administrator in...

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GitHub Activity

 

Twitter

How can you investigate an incident if the logs have been deleted by an attacker?! 🙉😟

In our latest article, Dray ( @Purp1eW0lf) offers some digital forensics techniques you can use when the Windows event logs have been wiped! 🕵️‍♂️🕵️‍♀️

https://t.co/g4z12irzQB
What's your controversial cyber security opinion? #infosec #cybersecurity

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