CVE-2024-5268 in Sonos Era 100
Summary
by MITRE • 06/06/2024
Sonos Era 100 SMB2 Message Handling Out-Of-Bounds Read Information Disclosure Vulnerability. This vulnerability allows network-adjacent attackers to disclose sensitive information 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 read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-22428.
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Analysis
by VulDB Data Team • 09/24/2024
The CVE-2024-5268 vulnerability represents a critical information disclosure flaw in Sonos Era 100 smart speakers that stems from improper handling of Server Message Block version 2 (SMB2) messages. This vulnerability resides in the network protocol processing layer of the device's firmware, where insufficient input validation leads to out-of-bounds memory read operations. The flaw is particularly concerning because it requires no authentication to exploit, making it accessible to any network-adjacent attacker who can send crafted SMB2 packets to the affected device. The vulnerability was identified and tracked as ZDI-CAN-22428, indicating its recognition within the cybersecurity community as a significant threat to IoT device security.
The technical implementation of this vulnerability involves the SMB2 message processing subsystem failing to properly validate the length and structure of incoming data packets before attempting to read from memory buffers. When a malformed SMB2 message is received, the system does not adequately check buffer boundaries, allowing an attacker to craft specific packets that cause the device to read memory locations beyond the intended buffer limits. This out-of-bounds read can expose sensitive information including system memory contents, configuration data, credentials, or other confidential information stored in the device's memory space. The vulnerability's classification aligns with CWE-129, which addresses insufficient validation of length of input data, and CWE-787, which covers out-of-bounds write operations that can lead to information disclosure.
From an operational perspective, this vulnerability presents a significant risk to users of Sonos Era 100 devices as it allows for remote information disclosure without requiring any authentication credentials. Attackers can leverage this vulnerability to gather sensitive data from the device's memory, potentially including network configuration details, user preferences, or other confidential information that could be used for further attacks. The lack of authentication requirements means that this vulnerability is particularly dangerous in network environments where the device is accessible to untrusted parties, such as in office networks or public spaces. The vulnerability's potential for exploitation aligns with ATT&CK technique T1046, which covers network service scanning and the exploitation of network-based vulnerabilities.
The impact of this vulnerability extends beyond simple information disclosure, as the sensitive data exposed could potentially provide attackers with enough information to develop more sophisticated attacks against the device or the network it operates within. An attacker who successfully exploits this vulnerability could potentially use the disclosed information to craft more targeted attacks, including privilege escalation or further exploitation of other vulnerabilities present in the system. The root context of this vulnerability suggests that the device's firmware may be vulnerable to arbitrary code execution when combined with other exploitation techniques, making it a particularly dangerous flaw in IoT security. Organizations should consider implementing network segmentation and access controls to limit exposure to this vulnerability, while also monitoring for any signs of exploitation attempts. The vulnerability highlights the importance of proper input validation and memory safety practices in embedded systems and IoT devices, particularly those that process network protocols without requiring authentication.