Awesome
ConfusedDotnet
A tool for checking for lingering free namespaces for private package names referenced in dependency configuration
for Nuget (nuget) packages.config or the new PackageReference style.
What is this all about?
On 9th of February 2021, a security researcher Alex Birsan published an article that touched different resolve order flaws in dependency management tools present in multiple programming language ecosystems.
Microsoft released a whitepaper describing ways to mitigate the impact, while the root cause still remains.
Interpreting the tool output
confused simply reads through a dependency definition file of an application and checks the public package repositories
for each dependency entry in that file. It will proceed to report all the package names that are not found in the public
repositories - a state that implies that a package might be vulnerable to this kind of attack, while this vector has not
yet been exploited.
This however doesn't mean that an application isn't already being actively exploited. If you know your software is using private package repositories, you should ensure that the namespaces for your private packages have been claimed by a trusted party (typically yourself or your company).
Installation
dotnet sdk is a prerequisite for this tool to work. You can download it here: https://dotnet.microsoft.com/download
Usage
Usage:
./confused.ps1 [-w C:\example\directory] [--checkforpackagesconfig] [--solution C:\example\directory\Example.sln]
Usage of ./confused.ps1:
-w string
Working directory, this is used for globbing for packages.config files, only needed in conjunction with --checkforpackagesconfig, if not set your current working directory will be used
--checkforpackagesconfig
Indicates that the working directory should be globbed for packages.config files
--solution string
The .sln file that should be scanned for project files, those project files are then scanned for PackagesReferences
Example
.\confused.ps1 -w C:\example\directory\ --solution C:\example\directory\Example.sln --checkforpackagesconfig
========================================
CheckSolution
========================================
Package id: Example.Internal.Nuget was not found on nuget.org repository
Package id: Example.VeryInternal.Nuget was not found on nuget.org repository
Package id: Example.SuperInternal.Nuget was not found on nuget.org repository
========================================
Default
========================================
Task Duration
--------------------------------------------------
GatherPackageReferences 00:00:00.9973370
CheckNugetForPackages 00:01:08.6440376
CheckSolution 00:00:00.0141526
--------------------------------------------------
Total: 00:01:09.6577472