Overview
CVE-2025-29845 is a medium-severity vulnerability affecting VideoPlayer2. This flaw allows remote, authenticated users to potentially read sensitive subtitle files (.srt) without proper authorization. This can lead to the exposure of information embedded within the subtitles, which could include dialogue, translations, and even embedded scripts or notes, depending on the use case.
Technical Details
The vulnerability resides within the subtitle handling CGI script of VideoPlayer2. It’s believed that insufficient access control checks are performed before allowing a user to retrieve a requested .srt file. By crafting a specific request, an authenticated user can bypass the intended file access restrictions and read the contents of any .srt file accessible to the VideoPlayer2 application. This could be achieved through path traversal or other similar techniques.
CVSS Analysis
The Common Vulnerability Scoring System (CVSS) assigns CVE-2025-29845 a score of 4.3 (Medium).
- Base Score: 4.3
- Vector: AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
This CVSS vector indicates the following:
- AV:N (Attack Vector: Network): The vulnerability is exploitable over the network.
- AC:L (Attack Complexity: Low): The attack is relatively easy to perform.
- PR:L (Privileges Required: Low): The attacker needs low-level privileges (i.e., authentication) to exploit the vulnerability.
- UI:N (User Interaction: None): No user interaction is required.
- S:U (Scope: Unchanged): The vulnerability’s impact is limited to the affected component.
- C:L (Confidentiality: Low): There is limited impact to confidentiality. Sensitive information may be disclosed.
- I:N (Integrity: None): There is no impact to integrity.
- A:N (Availability: None): There is no impact to availability.
Possible Impact
The impact of this vulnerability depends on the content of the exposed subtitle files. A successful exploit could lead to:
- Information Disclosure: Exposure of dialogue, translations, or other textual information within the .srt files.
- Potential for Script Injection (in certain cases): If the VideoPlayer2 application processes subtitles in a way that allows for script execution (though unlikely with standard .srt format), an attacker could potentially inject malicious scripts through a crafted subtitle file.
- Privacy Concerns: If subtitles contain personal information or sensitive data, its exposure could lead to privacy violations.
Mitigation or Patch Steps
The recommended mitigation is to apply the patch provided by the vendor. Synology has released an advisory and likely a corresponding update to VideoPlayer2 to address this vulnerability. Follow these steps:
- Check for Updates: Regularly check for updates to your VideoPlayer2 application through the official channels.
- Apply the Patch: Install the security patch released by Synology as soon as it is available.
- Review Access Controls: Ensure that access controls for VideoPlayer2 and its associated files are properly configured. Limit access to only authorized users.
- Monitor for Suspicious Activity: Monitor your system logs for any unusual activity that may indicate an attempted exploit.
