Package Instance

Unrestricted Upload of File with Dangerous Type
A File Upload vulnerability exists in Studio-42 elFinder 2.0.4 to 2.1.59 via connector.minimal.php, which allows a remote malicious user to upload arbitrary files and execute PHP code.

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
`connector.minimal.php` in std42 elFinder through 2.1.60 is affected by path traversal. This allows unauthenticated remote attackers to read, write, and browse files outside the configured document root. This is due to improper handling of absolute file paths.

Unrestricted Upload of File with Dangerous Type
The package studio-42/elfinder is vulnerable to Remote Code Execution (RCE) via execution of PHP code in a `.phar` file. This only applies if the server parses `.phar` files as PHP.

Studio 42 elFinder vulnerable to Incorrect Access Control
Studio 42 elFinder 2.1.64 is vulnerable to Incorrect Access Control. Copying files with an unauthorized extension between server directories allows an arbitrary attacker to expose secrets, perform RCE, etc.

Path Traversal
elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Several vulnerabilities affect elFinder These vulnerabilities can allow an attacker to execute arbitrary code and commands on the server hosting the elFinder PHP connector, even with minimal configuration. The issues were patched As a workaround, ensure the connector is not exposed without authentication.

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
_joinPath in elFinderVolumeLocalFileSystem.class.php in elFinder before 2.1.62 allows path traversal in the PHP LocalVolumeDriver connector.

elFinder: Command injection in resize background color parameter when using ImageMagick CLI
### Severity
**High**  
`bg` can be injected into shell command construction, leading to possible RCE in affected configurations.

### Summary

elFinder contains a command injection vulnerability in the `resize` command.

The `bg` (background color) parameter is accepted from user input and passed through image resize/rotate processing. In configurations that use the ImageMagick CLI backend, this value is incorporated into shell command strings without sufficient escaping. An attacker able to invoke the `resize` command with a crafted `bg` value may achieve arbitrary command execution as the web server process user.

This issue affects configurations where:
- the `resize` command is enabled,
- image processing uses the ImageMagick CLI backend, and
- the vulnerable code paths are reachable.


### Impact

An attacker may execute arbitrary OS commands with the privileges of the web server process.

Impact depends on server configuration, enabled commands, backend image library selection, and surrounding deployment controls.


### Affected versions

Affected: all versions before 2.1.66
Patched: 2.1.67


### Details

The vulnerable flow is:

1. The `resize` command accepts the `bg` parameter from the request.
2. The parameter is passed into volume resize handling.
3. In ImageMagick CLI code paths, the value is interpolated into shell command strings.
4. Because the value is not safely constrained and escaped, shell metacharacters may be injected.

The issue was addressed by:
- validating `bg` against a strict allowlist of supported color formats, and
- safely escaping the value before it is passed into CLI command construction.


### Workarounds

Possible mitigations for users who cannot upgrade immediately:

- disable the `resize` command if not required,
- avoid using the ImageMagick CLI backend for image processing,
- restrict access to trusted users only.

Upgrading to the patched release is strongly recommended.


### Credits

Thanks to Lin, WeiChi and Drew Webber for the responsible disclosure.