The vulnerability stems from improper path validation during package installation. Key functions identified are:

1. PackageController.InstallPackage - Entry point for package installation that would process malicious package.xml
2. PackageInstallation.ExtractPackageFiles - Directly handles file extraction logic where path traversal would occur While exact code isn't shown, advisory explicitly states the install process lacked the path containment checks present in uninstall routines. These functions would appear in stack traces when processing malicious package files with '../' in orgPath attributes.