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{% embed url="https://websec.nl/" %} **This is a summary of the post [https://census-labs.com/news/2021/04/14/whatsapp-mitd-remote-exploitation-CVE-2021-24027/](https://census-labs.com/news/2021/04/14/whatsapp-mitd-remote-exploitation-CVE-2021-24027/)** ### Listing Files in Media Store To list files managed by the Media Store, the command below can be used: ```bash $ content query --uri content://media/external/file ``` For a more human-friendly output, displaying only the identifier and path of each indexed file: ```bash $ content query --uri content://media/external/file --projection _id,_data ``` Content providers are isolated in their own private namespace. Access to a provider requires the specific `content://` URI. Information about the paths for accessing a provider can be obtained from application manifests or the Android framework's source code. ### Chrome's Access to Content Providers Chrome on Android can access content providers through the `content://` scheme, allowing it to access resources like photos or documents exported by third-party applications. To illustrate this, a file can be inserted into the Media Store and then accessed via Chrome: Insert a custom entry into the Media Store: ```bash cd /sdcard echo "Hello, world!" > test.txt content insert --uri content://media/external/file \ --bind _data:s:/storage/emulated/0/test.txt \ --bind mime_type:s:text/plain ``` Discover the identifier of the newly inserted file: ```bash content query --uri content://media/external/file \ --projection _id,_data | grep test.txt # Output: Row: 283 _id=747, _data=/storage/emulated/0/test.txt ``` The file can then be viewed in Chrome using a URL constructed with the file's identifier. For instance, to list files related to a specific application: ```bash content query --uri content://media/external/file --projection _id,_data | grep -i ``` ### Chrome CVE-2020-6516: Same-Origin-Policy Bypass The _Same Origin Policy_ (SOP) is a security protocol in browsers that restricts web pages from interacting with resources from different origins unless explicitly allowed by a Cross-Origin-Resource-Sharing (CORS) policy. This policy aims to prevent information leaks and cross-site request forgery. Chrome considers `content://` as a local scheme, implying stricter SOP rules, where each local scheme URL is treated as a separate origin. However, CVE-2020-6516 was a vulnerability in Chrome that allowed a bypass of SOP rules for resources loaded via a `content://` URL. In effect, JavaScript code from a `content://` URL could access other resources loaded via `content://` URLs, which was a significant security concern, especially on Android devices running versions earlier than Android 10, where scoped storage was not implemented. The proof-of-concept below demonstrates this vulnerability, where an HTML document, after being uploaded under **/sdcard** and added to the Media Store, uses `XMLHttpRequest` in its JavaScript to access and display the contents of another file in the Media Store, bypassing the SOP rules. Proof-of-Concept HTML: ```xml PoC ```
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