CVE-2024-5256 in Sonos Era 100
Summary
by MITRE • 06/06/2024
Sonos Era 100 SMB2 Message Handling Integer Underflow 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 an integer underflow before reading from memory. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-22336.
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Analysis
by VulDB Data Team • 09/24/2024
The CVE-2024-5256 vulnerability represents a critical information disclosure flaw affecting Sonos Era 100 smart speakers that operates within the Server Message Block version 2 protocol implementation. This vulnerability stems from inadequate input validation mechanisms during SMB2 message processing, creating a scenario where malformed data can trigger unexpected behavior in the device's memory management systems. The flaw specifically manifests as an integer underflow condition that occurs before memory read operations, allowing attackers to manipulate the system's memory access patterns in unintended ways.
This vulnerability operates at the network protocol level and presents a significant risk due to its accessibility from adjacent network positions without requiring authentication credentials for exploitation. The integer underflow condition creates a predictable memory access pattern that can be leveraged to extract sensitive information from the device's memory space. The absence of authentication requirements makes this vulnerability particularly dangerous as it can be exploited by any attacker within network range, potentially compromising the entire smart home ecosystem that relies on Sonos devices for audio services.
The technical exploitation of this vulnerability follows established patterns documented in cybersecurity frameworks, where improper input validation leads to memory corruption issues that can be chained with other vulnerabilities to achieve privilege escalation. This particular flaw aligns with CWE-191, which describes integer underflow conditions, and demonstrates how such issues can serve as stepping stones for more sophisticated attacks. The vulnerability's classification under ATT&CK technique T1059.007 for application layer protocol manipulation indicates its potential for being used in broader attack chains targeting network services.
The operational impact of this vulnerability extends beyond simple information disclosure, as the integer underflow can potentially be leveraged to gain root-level privileges on affected devices. This privilege escalation capability transforms what might initially appear as a data exposure issue into a serious system compromise vulnerability. Attackers can exploit this condition to extract sensitive configuration data, user credentials, or other confidential information stored in the device's memory. The implications are particularly severe for smart home environments where these devices often serve as central hubs for audio control and may contain network credentials or access keys for other connected systems.
Organizations and individuals should implement immediate mitigations including network segmentation to isolate smart home devices from critical network segments, disabling unnecessary SMB services where possible, and applying firmware updates as soon as they become available from Sonos. Network monitoring should be enhanced to detect unusual SMB2 traffic patterns that might indicate exploitation attempts. The vulnerability's nature suggests that comprehensive network access controls and regular security assessments of IoT devices are essential for preventing unauthorized access to smart home ecosystems. Additionally, implementing network intrusion detection systems specifically configured to identify SMB2 protocol anomalies can provide early warning capabilities for potential exploitation attempts.