CVE-2022-27624 in DSM
Summary
by MITRE • 10/20/2022
A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the packet decryption functionality of Out-of-Band (OOB) Management. This allows remote attackers to execute arbitrary commands via unspecified vectors. The following models with Synology DiskStation Manager (DSM) versions before 7.1.1-42962-2 may be affected: DS3622xs+, FS3410, and HD6500.
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Analysis
by VulDB Data Team • 11/18/2022
This vulnerability represents a classic buffer overflow condition that occurs within the out-of-band management subsystem of Synology DiskStation devices. The flaw manifests in the packet decryption functionality where insufficient bounds checking allows malicious data to overwrite adjacent memory regions. The vulnerability is classified as a memory safety issue that falls under the Common Weakness Enumeration category CWE-121, which describes the weakness of insufficient control of the boundaries of a memory buffer. The affected models including DS3622xs+, FS3410, and HD6500 operate with DSM versions prior to 7.1.1-42962-2, making them susceptible to exploitation through network-based attacks that target the management interface.
The technical implementation of this vulnerability allows remote attackers to craft specially malformed packets that trigger the buffer overflow condition during decryption operations. When the management subsystem processes these packets, the improper restriction of memory operations enables an attacker to overwrite critical memory locations including return addresses or function pointers. This memory corruption can be leveraged to execute arbitrary code with the privileges of the management service, effectively providing attackers with remote command execution capabilities. The unspecified attack vectors suggest that the vulnerability may be exploitable through multiple network protocols or interfaces within the OOB management system, potentially including HTTP, HTTPS, or dedicated management protocols.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass full system compromise and potential data exfiltration. Attackers who successfully exploit this vulnerability can gain persistent access to the affected devices, potentially using them as stepping stones for broader network infiltration. The out-of-band management interface typically provides administrative access to devices even when the primary operating system is compromised, making this vulnerability particularly dangerous for enterprise environments. This aligns with the ATT&CK framework's technique T1059.001 for command and script interpreter, as attackers can execute arbitrary commands through the compromised management interface. The vulnerability also relates to T1566 for spearphishing with a malicious attachment or link, as the exploitation may occur through network-based attacks targeting the management protocols.
Organizations should prioritize immediate remediation by upgrading to DSM version 7.1.1-42962-2 or later, which includes patches addressing the buffer overflow condition. Network segmentation and access control measures should be implemented to limit exposure of management interfaces to trusted networks only. The mitigation strategy should also include monitoring for unusual network traffic patterns that might indicate exploitation attempts, particularly around the management ports and protocols. Additionally, implementing network intrusion detection systems with signatures specific to this vulnerability can provide early warning of attempted exploitation. Regular security assessments of network infrastructure should include verification of device firmware versions and management interface configurations to prevent similar vulnerabilities from remaining unpatched. The vulnerability demonstrates the critical importance of maintaining up-to-date firmware and implementing proper network security controls around management interfaces to prevent unauthorized access to critical infrastructure devices.