Package Instance

Exposure of Resource to Wrong Sphere
Ibexa DXP ezsystems/ezpublish-kernel 7.5.x before 7.5.26 and 1.3.x before 1.3.12 allows Insecure Direct Object Reference (IDOR) attacks against image files because the image path and filename can be correctly deduced.

Duplicate
This advisory duplicates another.

Download route allows filename change
### Impact
The route used for file downloads allows specifying the name of the downloaded file. This is an unintended side effect of the implementation, and means one could construct download URLs with filenames that have no relation to the actual file, which could lead to misunderstandings and confusion, and possibly other harm. As such it is a low severity vulnerability. It affects all supported versions of Ibexa DXP and eZ Platform, in installations where downloadable files exist.

### Patches
The issue is fixed in all supported versions of ezsystems/ezplatform-kernel, see "Patched versions".
An advisory is also published for ezsystems/ezpublish-kernel and ibexa/core, please see those repositories.
Commit: https://github.com/ezsystems/ezplatform-kernel/commit/affa2520e5e986e477ca7f7c93b9ca2c30188063

### Workarounds
None, other than blocking all downloads.

 ### References
 https://developers.ibexa.co/security-advisories/ibexa-sa-2023-005-vulnerabilities-in-solr-search-and-file-downloads

Timing attack in eZ Platform Ibexa
Ibexa DXP is using random execution time to hinder timing attacks against user accounts, a method of discovering whether a given account exists in a system without knowing its password, thus affecting privacy. This implementation was found to not be good enough in some situations. The fix replaces this with constant time functionality, configured in the new security.yml parameter 'ibexa.security.authentication.constant_auth_time'. It will log a warning if the constant time is exceeded. If this happens the setting should be increased.

Duplicate Advisory: Cross Site Scripting in eZ Platform Ibexa Kernel
In file upload it is possible by certain means to upload files like .html and .js. These may contain XSS exploits which will be run when links to them are accessed by victims.
Patches

Ibexa Kernel's files with block listed extensions can be still saved to drafts
File validation can be configured to reject certain files by file type. When this happens, validation fails, and the content can't be published. However, the file can be saved when saving the content draft. This means unwanted files can be present in storage, even if they are not easily accessible due to the content not being published. The fix ensures these unwanted file types are never stored. An attacker would need to have existing access to create content with a file field type to exploit this.

Company admin role gives excessive privileges in eZ Platform Ibexa
Users with the Company admin role (introduced by the company account feature in v4) can assign any role to any user. This also applies to any other user that has the role / assign policy. Any subtree limitation in place does not have any effect.

The role / assign policy is typically only given to administrators, which limits the scope in most cases, but please verify who has this policy in your installaton. The fix ensures that subtree limitations are working as intended.