Holiday Hack Challenge 2025 (Act 1) - Spare Key

src/pentesting-cloud/azure-security/az-services/az-storage.md

@@ -65,7 +65,24 @@ If "Allow Blob public access" is **enabled** (disabled by default), when creatin
 
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-#### Auditing anonymous blob exposure
+### Static website (`$web`) exposure & leaked secrets
+
+- **Static websites** are served from the special `$web` container over a region-specific endpoint such as `https://<account>.z13.web.core.windows.net/`.
+- The `$web` container may report `publicAccess: null` via the blob API, but files are still reachable through the static site endpoint, so dropping config/IaC artifacts there can leak secrets.
+- Quick audit workflow:
+
+```bash
+# Identify storage accounts with static website hosting enabled
+az storage blob service-properties show --account-name <acc-name> --auth-mode login
+# Enumerate containers (including $web) and their public flags
+az storage container list --account-name <acc-name> --auth-mode login
+# List files served by the static site even when publicAccess is null
+az storage blob list --container-name '$web' --account-name <acc-name> --auth-mode login
+# Pull suspicious files directly (e.g., IaC tfvars containing secrets/SAS)
+az storage blob download -c '$web' --name iac/terraform.tfvars --file /dev/stdout --account-name <acc-name> --auth-mode login
+```
+
+### Auditing anonymous blob exposure
 
 - **Locate storage accounts** that can expose data: `az storage account list | jq -r '.[] | select(.properties.allowBlobPublicAccess==true) | .name'`. If `allowBlobPublicAccess` is `false` you cannot turn containers public.
 - **Inspect risky accounts** to confirm the flag and other weak settings: `az storage account show --name <acc> --query '{allow:properties.allowBlobPublicAccess, minTls:properties.minimumTlsVersion}'`.
@@ -467,6 +484,7 @@ az-file-shares.md
 - [https://learn.microsoft.com/en-us/azure/storage/blobs/storage-blobs-introduction](https://learn.microsoft.com/en-us/azure/storage/blobs/storage-blobs-introduction)
 - [https://learn.microsoft.com/en-us/azure/storage/common/storage-sas-overview](https://learn.microsoft.com/en-us/azure/storage/common/storage-sas-overview)
 - [https://learn.microsoft.com/en-us/azure/storage/blobs/secure-file-transfer-protocol-support](https://learn.microsoft.com/en-us/azure/storage/blobs/secure-file-transfer-protocol-support)
+- [Holiday Hack Challenge 2025 – Spare Key (Azure static website SAS leak)](https://0xdf.gitlab.io/holidayhack2025/act1/spare-key)
 - [Holiday Hack Challenge 2025: Blob Storage (Storage Secrets)](https://0xdf.gitlab.io/holidayhack2025/act1/blob-storage)
 - [https://learn.microsoft.com/en-us/cli/azure/storage/account](https://learn.microsoft.com/en-us/cli/azure/storage/account)
 - [https://learn.microsoft.com/en-us/cli/azure/storage/container](https://learn.microsoft.com/en-us/cli/azure/storage/container)