Azure Netbios Unrestricted Access
Description
Detects Azure Network Security Groups (NSGs) that allow unrestricted access to NetBIOS ports (TCP 139 and UDP 137-138) from any source IP address. Unrestricted NetBIOS access can expose Windows file sharing and name resolution services to potential attacks from the internet.
Detection Strategy
• Examines each security rule in Azure Network Security Groups
• Reports a vulnerability if TCP port 139 is accessible from any IP address ('*' or '0.0.0.0/0')
• Reports a vulnerability if UDP ports 137-138 are accessible from any IP address ('*' or '0.0.0.0/0')
• Checks rules that use either TCP, UDP, or all protocols ('*')
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