Security scan process¶
Scans run on demand when you initiate them in the MSR web UI or automatically when you push an image to the registry.
The scanner first performs a binary scan on each layer of the image, identifies the software components in each layer, and indexes the SHA of each component in a bill-of-materials. A binary scan evaluates the components on a bit-by-bit level, so vulnerable components are discovered even if they are statically linked or use a different name.
The scan then compares the SHA of each component against the US National Vulnerability Database that is installed on your MSR instance. When this database is updated, MSR verifies whether the indexed components have newly discovered vulnerabilities.
MSR has the ability to scan both Linux and Windows images. However, because Docker defaults to not pushing foreign image layers for Windows images, MSR does not scan those layers. If you want MSR to scan your Windows images, configure Docker to always push image layers, and it will scan the non-foreign layers.