Beware Of The Default Rules In Network Security Groups
Read OriginalThis technical article details a common and dangerous assumption in Azure security. It explains that the default 'AllowVnetInBound' rule (65000) in a Network Security Group (NSG) permits traffic not just from the local virtual network, but also from peered networks, VPN-connected on-premises networks, and routes defined in user-defined routes. Using a ransomware scenario, it warns that this can unintentionally expose resources, emphasizing the need for explicit deny rules over reliance on defaults.
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