CVE-2022-49042: Synology Hyper Backup Explorer Arbitrary Code Execution via MinGW DLL

Technical summary

CVE-2022-49042 is an inclusion of untrusted control sphere vulnerability (CWE-829) in the MinGW DLL component of Synology Hyper Backup Explorer. The flaw permits local privilege escalation and arbitrary code execution when an authenticated user interacts with the application. The attack vector is local with low complexity; no user interaction beyond initial execution is required. All three security properties—confidentiality, integrity, and availability—are compromised at the confidential impact level.

Business impact

Organizations relying on Synology Hyper Backup Explorer for backup management face risk of unauthorized code execution within the backup infrastructure. Compromise could lead to data theft, modification of backup data, or disruption of backup operations—all critical for business continuity. Systems used for backup orchestration or data recovery may become attack vectors for lateral movement into protected networks.

Affected systems

Synology Hyper Backup Explorer versions prior to 3.0.1-0156 are affected. Organizations should verify their installed version against this threshold. The vulnerability applies specifically to the MinGW DLL component, though the exact deployment scope (Windows systems, specific architectures) should be confirmed against Synology's official advisory.

Exploitability

Exploitation requires local access and authenticated user privileges, which reduces opportunistic exploitation risk from external threat actors. However, for insiders, supply chain compromises, or systems with weak access controls, the low attack complexity makes this relatively straightforward to exploit. The vulnerability is not currently tracked in CISA's KEV catalog, suggesting limited evidence of active exploitation in the wild at present.

Remediation

Upgrade Synology Hyper Backup Explorer to version 3.0.1-0156 or later. Organizations should prioritize patching systems where Hyper Backup Explorer runs with elevated privileges or handles sensitive backup data. Verify patch deployment against the version number and confirm the MinGW DLL component is updated as part of the installation.

Patch guidance

Apply the official Synology security patch for Hyper Backup Explorer 3.0.1-0156 or newer through Synology's update mechanism. Verify the patch version matches vendor documentation before and after deployment. Test the patched version in a non-production environment to ensure no regression in backup functionality. Document patch dates and versions for compliance auditing.

Detection guidance

Monitor system logs for Hyper Backup Explorer process spawning unexpected child processes or accessing unusual libraries. File integrity monitoring on the MinGW DLL and related backup components can detect tampering. Network-based detection should flag Hyper Backup Explorer communicating to unexpected destinations. Organizations without patch capability should increase logging verbosity on systems running the application to detect anomalous behavior.

Why prioritize this

Although not yet in active exploitation, this HIGH-severity vulnerability affects backup infrastructure—a critical target for attackers seeking to disable recovery options or exfiltrate protected data. The low attack complexity and local access requirement make it a realistic insider or post-compromise threat. Backup systems are frequently targeted to maximize ransomware impact, making patching urgent for any organization with elevated risk tolerance for backup compromise.

Risk score, explained

The CVSS 3.1 score of 7.8 (HIGH) reflects the combination of local attack vector, low complexity, full confidentiality and integrity impact, and availability impact. While the requirement for local user privileges limits the threat model, the scope of potential damage to backup data and system compromise justifies the elevated severity. Organizations with strong logical access controls may assess this as medium-priority; those with weaker boundaries should treat it as urgent.

Frequently asked questions