[CKAN-Security] Information Disclosure -- private dataset existence and metadata to unauthenticated users.

Tue Nov 19 12:19:49 UTC 2019

Versions: 2.8.3 -> 1.3.1

I've checked the 2.8, 2.7, 2.6 and 2.5 branches, and looked at a few other branches back to 1.3.1 and the affected file doesn't appear to have changed significantly in that time.  Current master is different as the affected file has been removed. It may be vulnerable, but has not been checked.

The Revisions controller only checks permissions for: 
  * Changing status of a revision
  * Site Read
  * the Atom feed filters out private datasets, but the regular list controller does not. 

# List Controller:
https://github.com/ckan/ckan/blame/2.8/ckan/controllers/revision.py#L125 <https://github.com/ckan/ckan/blame/2.8/ckan/controllers/revision.py#L125>

This shows all revisions in the system to unauthenticated users at the url /revision.

# Diff Controller:

The diff controller has no access control, and will show field level diffs of changes, once again, a private dataset and an unauthenticated user:

As far as I can tell, this affects all shipping versions of CKAN. 

I've applied for a CVE in relation to this issue. 

Thanks,

Eric

Eric Soroos, Senior Developer
Derilinx - Linked & Open Data Solutions

Web: www.derilinx.com
Email: eric at derilinx.com
Address: Pembroke Hall, 38/39 Fitzwilliam Square West, Dublin 2, D02 NX53
Tel: +353 (0)1 254 4316
Mob: +353 (0)83 8730257
Twitter: @derilinx

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