CVE-2024-47272: Synology Surveillance Station Auth Bypass

CVE-2024-47272 Overview

CVE-2024-47272 is an incorrect authorization vulnerability [CWE-863] affecting Synology Surveillance Station. The flaw exists in the IO Module functionality and impacts versions prior to 9.2.2-11575 and 9.2.2-9575. Remote authenticated users with administrator privileges can perform limited file write operations through unspecified vectors. Synology disclosed the issue in advisory SA-24-25.

The vulnerability requires high privileges and produces limited integrity impact only. No confidentiality or availability impact is reported. The issue stems from improper authorization enforcement within the IO Module, which fails to validate administrative actions against expected access boundaries.

Critical Impact

Authenticated administrators can bypass authorization checks in the IO Module to perform limited file write operations on affected Synology Surveillance Station installations.

Affected Products

• Synology Surveillance Station versions before 9.2.2-11575
• Synology Surveillance Station versions before 9.2.2-9575
• IO Module functionality within Surveillance Station

Discovery Timeline

• 2026-05-27 - CVE-2024-47272 published to NVD
• 2026-05-27 - Last updated in NVD database
• Reference: Synology Security Advisory SA-24-25

Technical Details for CVE-2024-47272

Vulnerability Analysis

The vulnerability resides in the IO Module functionality of Synology Surveillance Station. Surveillance Station is a network video recording application running on Synology NAS devices. The IO Module integrates external input/output hardware with the surveillance platform.

The flaw is classified under [CWE-863] Incorrect Authorization. The IO Module performs operations without enforcing the expected authorization policy. As a result, authenticated administrative users can trigger file write operations that should be subject to stricter access controls.

Exploitation requires network access and valid administrator credentials. The integrity impact is limited because the writes are constrained, and there is no confidentiality or availability impact. The advisory does not document the specific vectors used to reach the vulnerable code path.

Root Cause

The root cause is missing or insufficient authorization checks in the IO Module code path that handles file write operations. The module trusts the caller's administrator role rather than validating each operation against the expected authorization boundary. Synology has not published implementation details beyond the advisory.

Attack Vector

The attack vector is network-based. An attacker must already possess administrator credentials on the target Surveillance Station instance. The attacker issues crafted requests to the IO Module to perform file write operations that should not be permitted. Because no public exploit or proof of concept is available, observed exploitation activity is not reported.

No verified code examples are available. Refer to the Synology Security Advisory SA-24-25 for vendor-provided technical context.

Detection Methods for CVE-2024-47272

Indicators of Compromise

• Unexpected file modifications in directories used by the Surveillance Station IO Module on the NAS file system.
• Administrator-authenticated HTTP requests targeting IO Module endpoints outside normal operational patterns.
• Surveillance Station audit log entries showing IO Module configuration changes from unusual source IP addresses.

Detection Strategies

• Inventory all Synology NAS devices running Surveillance Station and compare installed versions against 9.2.2-11575 and 9.2.2-9575.
• Review administrator account activity for anomalous logins, particularly outside business hours or from new geolocations.
• Correlate Surveillance Station web interface access logs with file system modification events on the NAS.

Monitoring Recommendations

• Forward Synology NAS system and application logs to a centralized log platform for retention and analysis.
• Monitor administrator session creation events and alert on infrequent or first-seen source addresses.
• Track file integrity for Surveillance Station configuration and IO Module directories using available NAS integrity tools.

How to Mitigate CVE-2024-47272

Immediate Actions Required

• Upgrade Synology Surveillance Station to version 9.2.2-11575 or 9.2.2-9575 or later, as appropriate for the deployed branch.
• Audit all administrator accounts and remove accounts that are no longer required.
• Rotate credentials for remaining administrator accounts and enforce strong, unique passwords.
• Restrict network access to the Surveillance Station management interface to trusted management networks only.

Patch Information

Synology has released fixed versions of Surveillance Station. Apply 9.2.2-11575 or 9.2.2-9575 according to the package channel in use. Consult the Synology Security Advisory SA-24-25 for the current fixed-version matrix and download links through Package Center.

Workarounds

• Limit Surveillance Station administrator privileges to a minimal set of accounts until patching is complete.
• Block external access to the Surveillance Station web interface using firewall rules or a VPN gateway.
• Enable two-factor authentication for all DSM and Surveillance Station administrator accounts.

# Configuration example: restrict Surveillance Station web access at the firewall
# Replace 10.0.0.0/24 with the trusted management network
iptables -A INPUT -p tcp --dport 9900 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 9900 -j DROP