CVE-2023-27355 : What You Need to Know

This CVE was published on April 20, 2023, by ZDI (Zero Day Initiative) and it affects installations of Sonos One Speaker version 70.3-35220. The vulnerability allows network-adjacent attackers to execute arbitrary code without requiring authentication, posing a high risk to confidentiality, integrity, and availability.

Understanding CVE-2023-27355

This section delves into the details of CVE-2023-27355, explaining the vulnerability, its impact, technical aspects, and mitigation strategies.

What is CVE-2023-27355?

CVE-2023-27355 is a security vulnerability that exists within the MPEG-TS parser of Sonos One Speaker version 70.3-35220. It enables attackers located adjacent to the network to execute arbitrary code on affected devices without the need for authentication.

The Impact of CVE-2023-27355

The impact of CVE-2023-27355 is significant as it allows attackers to exploit the lack of proper validation of user-supplied data length, leading to a stack-based buffer overflow. This can result in attackers executing code in the context of root, compromising the confidentiality, integrity, and availability of the affected system.

Technical Details of CVE-2023-27355

In this section, we will explore the technical aspects of CVE-2023-27355, including the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in the MPEG-TS parser of Sonos One Speaker version 70.3-35220 results from the inadequate validation of user-supplied data length before copying it to a fixed-length stack-based buffer. This flaw can be exploited by attackers to execute arbitrary code.

Affected Systems and Versions

The specific version of Sonos One Speaker affected by CVE-2023-27355 is 70.3-35220. Users running this version are vulnerable to network-adjacent attackers executing arbitrary code on their devices.

Exploitation Mechanism

Attackers leverage the lack of validation of user-supplied data length to overflow the stack-based buffer, allowing them to execute malicious code in the context of root on the affected Sonos One Speaker installations.

Mitigation and Prevention

To safeguard against CVE-2023-27355, it is crucial to take immediate steps, implement long-term security practices, and apply necessary patches and updates to mitigate the risks posed by this vulnerability.

Immediate Steps to Take

Disable remote access to affected Sonos One Speaker devices.
Monitor network traffic for any suspicious activities.
Contact Sonos for guidance on securing the affected devices.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.
Conduct regular security audits and penetration testing to identify and address weaknesses proactively.

Patching and Updates

Sonos is expected to release security patches and updates to address CVE-2023-27355. Users are advised to promptly apply these patches to secure their Sonos One Speaker installations and mitigate the risk of exploitation.