CVE-2024-5267 in Sonos Era 100
Summary
by MITRE • 06/06/2024
Sonos Era 100 SMB2 Message Handling Out-Of-Bounds Write 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 proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-22384.
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Analysis
by VulDB Data Team • 09/24/2024
The CVE-2024-5267 vulnerability represents a critical remote code execution flaw in Sonos Era 100 smart speakers that operates through the Server Message Block version 2 protocol implementation. This vulnerability falls under the category of out-of-bounds write conditions, specifically classified as CWE-787, which occurs when a program writes data past the end of a buffer allocated for that data. The flaw exists within the SMB2 message handling mechanism where insufficient input validation allows attackers to craft malicious SMB2 packets that trigger buffer overflow conditions.
The security implications of this vulnerability are severe as it enables network-adjacent attackers to achieve arbitrary code execution without requiring authentication credentials, making it particularly dangerous in environments where network access is not strictly controlled. The vulnerability's exploitation path leverages the SMB2 protocol's message processing functions, where user-supplied data is not properly validated before being written to allocated memory buffers. This allows attackers to overwrite adjacent memory locations, potentially leading to code execution with root privileges as indicated by the vulnerability's ability to execute code in the context of root.
The operational impact of CVE-2024-5267 extends beyond simple remote code execution to encompass complete system compromise of affected Sonos Era 100 devices. Attackers can exploit this vulnerability to install malicious software, modify system configurations, access sensitive data, or establish persistent backdoors within the affected smart speaker ecosystem. The fact that no authentication is required for exploitation makes this vulnerability particularly attractive to threat actors who may not have legitimate access to the network. This vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter, as successful exploitation would allow attackers to execute commands on the compromised device.
The technical nature of this vulnerability demonstrates a classic buffer overflow scenario where memory safety checks are bypassed during SMB2 message processing. The lack of proper bounds checking in the message handling code creates an opportunity for attackers to manipulate memory layout and potentially redirect execution flow. This type of vulnerability commonly arises from insufficient input validation and improper memory management practices, making it a frequent target for exploitation in IoT and embedded systems. The vulnerability's classification as a remote code execution flaw places it within the ATT&CK matrix under privilege escalation and execution techniques, specifically targeting the device's operating system kernel or core services. Organizations should implement network segmentation to limit access to these devices and ensure immediate patching of affected systems to prevent exploitation of this critical vulnerability.