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Disallow all COM for AppLocker system lock down #16268

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Merged
daxian-dbw merged 1 commit into from
Oct 19, 2021
Merged

Disallow all COM for AppLocker system lock down #16268

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8 changes: 8 additions & 0 deletions src/System.Management.Automation/security/wldpNativeMethods.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -391,6 +391,14 @@ private static SystemEnforcementMode GetDebugLockdownPolicy(string path)
/// <returns>True if the COM object is allowed, False otherwise.</returns>
internal static bool IsClassInApprovedList(Guid clsid)
{
// This method is called only if there is an AppLocker and/or WLDP system wide lock down enforcement policy.
if (s_cachedWldpSystemPolicy.GetValueOrDefault(SystemEnforcementMode.None) != SystemEnforcementMode.Enforce)
{
// No WLDP policy implies only AppLocker policy enforcement. Disallow all COM object instantiation.
return false;
}

// WLDP policy must be in system wide enforcement, look up COM Id in WLDP approval list.
try
{
WLDP_HOST_INFORMATION hostInformation = new WLDP_HOST_INFORMATION();
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