COPY '--from' References Current FROM Alias

Query id: cdddb86f-95f6-4fc4-b5a1-483d9afceb2b
Query name: COPY '--from' References Current FROM Alias
Platform: Dockerfile
Severity: High
Category: Build Process
URL: Github

Description¶

COPY '--from' should not mention the current FROM alias, since it is impossible to copy from itself
Documentation

Code samples¶

Code samples with security vulnerabilities¶

Postitive test num. 1 - dockerfile file

FROM myimage:tag as dep
COPY --from=dep /binary /
RUN dir c:\

Code samples without security vulnerabilities¶

Negative test num. 1 - dockerfile file

FROM golang:1.7.3 AS builder
WORKDIR /go/src/github.com/alexellis/href-counter/
RUN go get -d -v golang.org/x/net/html
COPY app.go    .
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .

# another dockerfile
FROM alpine:latest
RUN apk --no-cache add ca-certificates
WORKDIR /root/
COPY --from=builder /go/src/github.com/alexellis/href-counter/app .
CMD ["./app"]