Overview
CVE-2024-45539 is a high-severity vulnerability affecting Synology DiskStation Manager (DSM) and Synology Unified Controller (DSMUC). This out-of-bounds write flaw in the CGI components allows remote attackers to potentially trigger a denial-of-service (DoS) condition. It’s crucial for Synology NAS users to update their systems immediately to mitigate this risk.
Technical Details
The vulnerability, identified as CVE-2024-45539, is an out-of-bounds write issue within the CGI components of Synology DSM and DSMUC. An attacker can exploit this flaw by sending crafted requests to the affected systems. The specific vectors leading to the out-of-bounds write are not detailed in the initial advisory, but given the nature of CGI components, it likely involves manipulating input parameters. Successful exploitation could allow an attacker to overwrite memory regions, leading to system instability or a crash.
CVSS Analysis
The Common Vulnerability Scoring System (CVSS) assigns a score of 7.5 to CVE-2024-45539, indicating a HIGH severity. This score reflects the potential for remote exploitation and the impact on system availability. Here’s a breakdown of the factors contributing to the score:
- Attack Vector: Network (AV:N)
- Attack Complexity: Low (AC:L)
- Privileges Required: None (PR:N)
- User Interaction: None (UI:N)
- Scope: Unchanged (S:U)
- Confidentiality Impact: None (C:N)
- Integrity Impact: None (I:N)
- Availability Impact: High (A:H)
The low attack complexity and lack of required privileges make this vulnerability particularly concerning.
Possible Impact
A successful exploit of CVE-2024-45539 can lead to the following:
- Denial-of-Service (DoS): The most likely outcome is a denial-of-service attack, where the Synology device becomes unresponsive or crashes, disrupting services and data access.
- Potential for Further Exploitation: While currently classified as a DoS vulnerability, an out-of-bounds write can sometimes be leveraged for more severe attacks if an attacker can precisely control the memory being overwritten. This could potentially lead to code execution, though further analysis would be required to confirm this.
Mitigation/Patch Steps
The primary mitigation for CVE-2024-45539 is to update your Synology DSM or DSMUC to the patched versions as soon as possible. Follow these steps:
- DSM Users: Update to version 7.2.1-69057-2 or later, or 7.2.2-72806 or later.
- DSMUC Users: Update to version 3.1.4-23079 or later.
- Check for Updates: Log in to your Synology DSM/DSMUC web interface.
- Go to Control Panel: Navigate to “Control Panel” > “Update & Restore”.
- Download and Install: Click “Download” to download the latest version and then “Update Now” to install it.
- Reboot: Your Synology device will likely need to reboot to complete the update.
If you are unable to update immediately, consider temporarily disabling any unnecessary services exposed to the internet and closely monitor your system logs for suspicious activity.
