CVE-2024-5269 in Sonos Era 100
Summary
by MITRE • 06/06/2024
Sonos Era 100 SMB2 Message Handling Use-After-Free Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Sonos Era 100 smart speakers. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the handling of SMB2 messages. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-22459.
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Analysis
by VulDB Data Team • 09/24/2024
The CVE-2024-5269 vulnerability represents a critical use-after-free flaw in the Sonos Era 100 smart speaker's SMB2 message handling implementation, classified under CWE-416 Use After Free. This vulnerability resides in the server message block version 2 protocol processing logic where the system fails to validate object existence before performing operations on memory objects. The flaw allows remote code execution without authentication, making it particularly dangerous as attackers only need network adjacency to exploit the vulnerability. The attack surface extends to any network-adjacent device capable of communicating with the affected Sonos speaker over SMB2 protocols, which typically includes local network segments where the speaker operates. This vulnerability directly maps to ATT&CK technique T1210 Exploitation of Remote Services, as it leverages network services to achieve remote code execution. The root cause stems from improper memory management practices where the system does not properly validate object references before dereferencing them, creating opportunities for attackers to manipulate memory contents. The vulnerability's severity is amplified by the fact that it operates at the system level, allowing attackers to execute code with the highest privileges available to the affected service. The specific implementation flaw occurs during SMB2 message processing where the speaker's firmware does not perform adequate validation of object pointers before attempting to access or modify them. This allows an attacker to potentially overwrite memory locations with malicious payloads, leading to complete system compromise and potential lateral movement within the network. The vulnerability's impact extends beyond the individual device as compromised Sonos speakers can serve as entry points for broader network infiltration. The ZDI-CAN-22459 reference indicates this vulnerability was identified through coordinated disclosure efforts, highlighting the importance of timely patching and vulnerability management. The lack of authentication requirements makes this particularly concerning for environments where network segmentation is not properly implemented. This vulnerability demonstrates the critical importance of proper input validation and memory management in embedded systems, where resource constraints often lead to implementation shortcuts that introduce security flaws. The attack scenario typically involves an attacker positioned on the same network segment as the target speaker, sending specially crafted SMB2 messages designed to trigger the use-after-free condition. The exploitation process would likely involve crafting specific memory layouts that, when processed by the vulnerable code, result in controlled memory corruption. This vulnerability aligns with ATT&CK tactic T1046 Network Service Scanning and T1059 Command and Scripting Interpreter, as attackers would need to identify the vulnerable device and then execute commands through the compromised system. The remediation approach should include immediate firmware updates from Sonos, network segmentation to limit adjacent access, and monitoring for unusual SMB2 traffic patterns. Organizations should also implement network access controls to restrict SMB2 communication to authorized endpoints only. The vulnerability underscores the necessity of robust memory safety practices in IoT devices and embedded systems, where traditional security measures may be insufficient. This flaw represents a classic example of how improper object lifetime management in network services can result in complete system compromise. The technical implications extend to the broader IoT security landscape, where similar vulnerabilities may exist in other embedded devices with insufficient input validation and memory management controls. Proper mitigation requires not only patching the specific vulnerability but also implementing comprehensive security monitoring and network segmentation strategies to prevent exploitation. The vulnerability's classification as remote code execution without authentication makes it particularly dangerous for enterprise environments where such devices are commonly deployed. This flaw highlights the critical need for security-by-design principles in IoT device development, where memory safety and proper input validation should be integral components of the development lifecycle rather than afterthoughts. The exploitation of this vulnerability could potentially lead to persistent backdoors, data exfiltration, or use as a pivot point for attacking other network resources.