services / Azure / Storage Blob Service Blobs

Blobs are the individual data objects (files) stored inside containers of an Azure Storage account's blob service. They hold an organization's unstructured production data such as documents, backups, media, and application data.

Data-plane access to blobs directly exposes stored organizational data; ADLS Gen2 (hierarchical namespace) accounts also expose POSIX ownership/ACLs at the blob level.

Microsoft.​Storage/​storageAccounts/​blobServices/​containers/​blobs/​modifyPermissions/​action

Modifying ADLS Gen2 POSIX permissions/ACLs on a blob lets an attacker grant themselves access to the data and revoke authorized principals' access.

Risks

1. Privilege escalation (CRITICAL)
2. Denial-of-access (EVASION)

Scope: HIGH

This privilege may grant access to sensitive data from a single organizational function, or allow interruption of a service supporting a single organizational function.

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