Multiple ENTRYPOINT Instructions Listed

  • Query id: 6938958b-3f1a-451c-909b-baeee14bdc97
  • Query name: Multiple ENTRYPOINT Instructions Listed
  • Platform: Dockerfile
  • Severity: Low
  • Category: Build Process
  • CWE: 1041
  • Risk score: 0.6
  • URL: Github

Description

There can only be one ENTRYPOINT instruction in a Dockerfile. Only the last ENTRYPOINT instruction in the Dockerfile will have an effect
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - dockerfile file
FROM golang:1.7.3
WORKDIR /go/src/github.com/foo/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 .

FROM alpine:latest  
RUN apk --no-cache add ca-certificates
WORKDIR /root/
COPY --from=0 /go/src/github.com/foo/href-counter/app .
ENTRYPOINT [ "/opt/app/run.sh", "--port", "8080" ]
ENTRYPOINT [ "/opt/app/run.sh", "--port", "8000" ]
Positive test num. 2 - dockerfile file
from golang:1.7.3
workdir /go/src/github.com/foo/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 .

from alpine:latest  
run apk --no-cache add ca-certificates
workdir /root/
copy --from=0 /go/src/github.com/foo/href-counter/app .
entrypoint [ "/opt/app/run.sh", "--port", "8080" ]
entrypoint [ "/opt/app/run.sh", "--port", "8000" ]

Code samples without security vulnerabilities

Negative test num. 1 - dockerfile file
FROM golang:1.7.3
WORKDIR /go/src/github.com/foo/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 .
ENTRYPOINT [ "/opt/app/run.sh", "--port", "8080" ]

FROM alpine:latest  
RUN apk --no-cache add ca-certificates
WORKDIR /root/
COPY --from=0 /go/src/github.com/foo/href-counter/app .
ENTRYPOINT [ "/opt/app/run.sh", "--port", "8080" ]
Negative test num. 2 - dockerfile file
FROM golang:1.16 AS builder
WORKDIR /go/src/github.com/foo/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 .
ENTRYPOINT [ "/opt/app/run.sh", "--port", "8080" ]
ENTRYPOINT [ "/opt/app/run.sh", "--port", "8000" ]

FROM alpine:latest  
RUN apk --no-cache add ca-certificates
WORKDIR /root/
COPY --from=builder /go/src/github.com/foo/href-counter/app ./
CMD ["./app"]
RUN useradd -ms /bin/bash patrick

USER patrick
Negative test num. 3 - dockerfile file
from golang:1.7.3
workdir /go/src/github.com/foo/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 .
entrypoint [ "/opt/app/run.sh", "--port", "8080" ]

from alpine:latest  
run apk --no-cache add ca-certificates
workdir /root/
copy --from=0 /go/src/github.com/foo/href-counter/app .
entrypoint [ "/opt/app/run.sh", "--port", "8080" ]