Jeff's Blog

Ramblings about Python, C#, security, cryptography, and more.

[CVE-2019-12374] LANDesk Management Server - SQL Injection

May 25, 2019 | SQL Injection vulnerability found in LDMS 10.0.1.168 Service Update 5 due to improper username sanitization.

A SQL injection vulnerability has been identified in the web API endpoint located at https://<coreserver>/landesk/managementsuite/core/provisioning.secure/ProvisioningSecure.asmx.

This vulnerability is present within the Provisioning.Secure.dll utilized by this API endpoint. If we decompile this DLL, the vulnerability can be clearly seen within 2 methods.

Provisioning.Secure.ProvUserValidator.UsernameExists(string strUserName)
Provisioning.Secure.ProvUserValidator.UsernameExists.png
Provisioning.Secure.ProvUserValidator.GetUserIdn(string strUserName)
Provisioning.Secure.ProvuserValidator.GetUserIdn.png

This…

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[CVE-2019-12376] LANDesk Management Server - Hard-coded Encryption Key

May 25, 2019 | Use of a hard-coded encryption key in LDMS 10.0.1.168 Service Update 5 may lead to full managed endpoint compromise

Multiple cryptographic vulnerabilities have been identified in the web API endpoint at http://<coreserver>/landesk/managementsuite/core/cmp.secure. These vulnerabilities compromise the at-rest security model of all data protected by this module, and could lead to unauthorized device decryption, credential disclosure, and full managed endpoint compromise.

This API endpoint is used for encryption of such sensitive information as filevault credentials, administrative override credentials, Windows credent…

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[CVE-2019-12375] LANDesk Management Server - Open Directories

May 25, 2019 | Open directories in LDMS 10.0.1.168 Service Update 5 may lead to information disclosure and arbitrary code execution

By design, multiple directories on the LDMS core server are wide-open and globally readable via HTTP. For example, see the following web locations available on an LDMS core server:

  • https://<coreserver>/ldlogon
  • https://<coreserver>/upl
  • https://<coreserver/landesk

While this is by design, it is a major architectural oversight. This design played an instrumental role in the discovery of many of these vulnerabilities, and allows for information disclosure and arbitrary code execution when paired wit…

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[CVE-2019-12373] LANDesk Management Server - Administrator Password Disclosure

May 25, 2019 | Improper access control and open directories in LDMS 10.0.1.168 Service Update 5 may lead to disclosure of administrator passwords

During an imaging task, the LANDesk provisioning subsystem creates a copy of each injected file in the globally readable network share \\<coreserver>\ldlogon\provisioning\config. This share is created during the LANDesk Management Core Server installation process, and the installer automatically sets the permissions such that "Everyone" can read from this directory.

Once the imaging task is finished, the file copies are usually removed. However, if an imaging task fails, the files are stored…

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[CVE-2019-12377] LANDesk Management Server - Arbitrary File Upload

May 25, 2019 | A vulnerable web API endpoint in LDMS 10.0.1.168 Service Update 5 allows arbitrary file upload, which may lead to arbitrary remote code execution

When a LANDesk managed endpoint is reporting inventory and patch level information to the core server, it leverages a web API endpoint found at https://<coreserver>/upl/async_upload.asp. This endpoint does not properly sanitize user-provided values, which allows for an attacker to both control the uploaded file extension and the uploaded file location.

As this is an ASP.NET web page, we can simply open the file in a text editor to see the vulnerable code. I opened it using Notepad++ to take a look.

The…

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LANDesk Management Server - Multiple Vulnerabilities

May 25, 2019 | Multiple vulnerabilities of varying severity have been identified in LDMS 10.0.1.168 Service Update 5

<p>The vendor has been notified of these vulnerabilities. This version is no longer being actively developed (end of life 12/31/2018), so these vulnerabilities will not be patched. However, fixes will be released for supported versions where applicable. These vulnerabilities affect the following LDMS modules:</p><p></p><ul><li>Managed endpoint security settings</li><li>Provisioning</li><li>Endpoint encryption / Mac file vault / Device Adminsitration</li><li>Device Inventory / Vulnerability Management</li></ul><p></p><p>These vulnerabilities range in severity from inconseque…</p>

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Splunk - AES-GCM Decryption failed!

Feb. 14, 2020 | How I tracked an obscure error through a black box and back by leveraging Ghidra

The Solution

Let's start things off right. For those of you who've ended up on this page searching for a solution to this issue, I won't make you read through this entire post to find it.

To resolve this issue, simply delete your passwords.conf files from the local folder within the affected apps and reconfigure those apps.

If you want to understand what makes this issue occur, and why deleting the passwords.conf file resolves the issue, please keep reading for the full breakdown.

The Cause

I ini…

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DEFCON RTV CTF Writeup

Aug. 13, 2020 | Reverse engineering the CovidClient malware using Ghidra, Remnux, Ubuntu on WSL, and Python

Introduction

The DEFCON Red Team Village CTF had a fun challenge this year based around reverse engineering some fake malware they'd named CovidClient. This is where a grand majority of my time (~20 hours) was spent during the competition. Since I'm writing this up a week after the competition, the CTFTime server has been taken down, so I'll have to recount most of the flags from memory. However, I will still be able to demonstrate my methodology and the tools I used to recover most of the…

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