Published | JUMPSEC LABS

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

by lrckt | Jan 26, 2022 | Research, Security Bug, Vulnerability

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...

Advisory CVE-2021-41550 Leostream Connection Broker – Authenticated Remote Code Execution

Software: Leostream Connection BrokerAffected Versions: 9.0.40.17Vendor page: https://leostream.com/CVE Reference: CVE-2021-41550Published: 25/01/2022Attack Vector: Remote,...

No Logs? No Problem! Incident Response without Windows Event Logs

In this article, we discuss some Digital Forensics and Incident Response (DFIR) techniques you can leverage when you encounter an environment without Windows event logs.

PowerShell Jobs

by editor | Oct 7, 2021 | Detection, Incident Response, Monitoring, Windows

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.

Burp Suite and Beyond: Exploring non-HTTP protocols using MITM_RELAY

by editor | Aug 24, 2021 | Application Security, burpsuite, network, Network Tools, Research

In this article, Muhammet takes us on a deep technical journey to persevere beyond the limitations of the proxy tool Burpsuite, and explore non-HTTP, application-layer protocols using ‘MITM RELAY’.

Running Once, Running Twice, Pwned! Windows Registry Run Keys

by editor | Aug 11, 2021 | Detection, Incident Response, Monitoring, Windows

The Windows registry is a vast and complex topic and cannot be understood and defended in one article. One particular area of interest from a security perspective is registry run keys. In this article, we discuss who uses them, how to uncover abuse, and how to eradicate evil from them.

Can Depix deobfuscate your data?

by editor | Aug 3, 2021 | Jumpsec, Obfuscation, Password Cracking, Uncategorized

In this post, Caleb explores Depix and its potential to recover sensitive text from reports that were redacted by the original authors.

Car Hacking – Manual Bypass of Modern Rolling Code Implementations

by 0x5c4r3 | Jul 22, 2021 | Exploitation, Social Engineering

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...

Obfuscating C2 During a Red Team Engagement

by editor | Jul 16, 2021 | Uncategorized

Command-and-Control (C2) infrastructure is one the most important tools in a red teamer’s arsenal. In this article, we introduce a few simple methods that red teams use to harden their C2 infrastructure.

PRINTNIGHTMARE NETWORK ANALYSIS

by editor | Jul 7, 2021 | Detection, Uncategorized

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...

Securing against new offensive techniques abusing active directory certificate service

by editor | Jul 6, 2021 | Detection, Vulnerability

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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JUMPSEC LABS

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

Advisory CVE-2021-41550 Leostream Connection Broker – Authenticated Remote Code Execution

No Logs? No Problem! Incident Response without Windows Event Logs

PowerShell Jobs

Burp Suite and Beyond: Exploring non-HTTP protocols using MITM_RELAY

Running Once, Running Twice, Pwned! Windows Registry Run Keys

Can Depix deobfuscate your data?

Obfuscating C2 During a Red Team Engagement

PRINTNIGHTMARE NETWORK ANALYSIS

Securing against new offensive techniques abusing active directory certificate service

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