Overview
CVE-2025-29844 is a medium severity vulnerability affecting Synology FileStation. This vulnerability allows a remote, authenticated user to read file metadata and path information that they should not normally have access to. This information leak could be leveraged for further attacks or to gain unauthorized knowledge of the NAS file structure.
Technical Details
The vulnerability resides within the FileStation’s CGI (Common Gateway Interface) component. Improper input validation and insufficient access control checks within the CGI script allow an attacker with valid login credentials to craft specific requests that bypass intended security mechanisms. By exploiting this, a user can obtain sensitive information like filenames, file sizes, timestamps, and potentially portions of directory structures.
CVSS Analysis
- CVSS Score: 4.3 (Medium)
- CVSS Vector: (Hypothetical – depends on exact vector, but likely AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
- Explanation: The score reflects the relatively low attack complexity and the need for authentication, but also acknowledges the potential for information disclosure, leading to a moderate confidentiality impact.
Possible Impact
The exploitation of CVE-2025-29844 could have the following impact:
- Information Disclosure: An attacker can learn the structure and organization of files on the NAS.
- Targeted Attacks: The revealed metadata can be used to identify specific files of interest, leading to more focused attacks.
- Privacy Concerns: Sensitive filenames or directory structures may reveal private information stored on the NAS.
Mitigation and Patch Steps
Synology has released a security update to address this vulnerability. It is highly recommended to update your FileStation package to the latest version as soon as possible.
- Check for Updates: Log in to your Synology NAS DSM (DiskStation Manager).
- Open Package Center: Navigate to the Package Center application.
- Update FileStation: Find the FileStation package and click “Update” if an update is available.
- Reboot if necessary: Follow any on-screen instructions, including rebooting the NAS if prompted.
If you are unable to update immediately, consider temporarily disabling FileStation if it is not essential to your workflow. Consult the Synology advisory for more detailed instructions.
