CVE-2021-42848 : Security Advisory and Response

An information disclosure vulnerability was reported in some Lenovo Personal Cloud Storage devices that could allow an unauthenticated user to retrieve device and networking details.

Understanding CVE-2021-42848

What is CVE-2021-42848?

CVE-2021-42848 is an information disclosure vulnerability affecting various Lenovo Personal Cloud Storage devices, potentially enabling unauthorized access to device and network information.

The Impact of CVE-2021-42848

This vulnerability has a CVSS base score of 4.3, classified as medium severity. It poses a threat to the confidentiality of data, with low complexity and no integrity impacts.

Technical Details of CVE-2021-42848

Vulnerability Description

The vulnerability allows unauthenticated users to extract sensitive device and networking details from affected Lenovo Personal Cloud Storage models.

Affected Systems and Versions

The following Lenovo Personal Cloud Storage devices are impacted:

Personal Cloud Storage A1 (Version < 5.3.6.a1)
Personal Cloud Storage T1 (Version < 5.3.6.t1)
Personal Cloud Storage X1 (Version < 5.3.8.x1)
Personal Cloud Storage T2 (Version < 5.3.8.t2)
Personal Cloud Storage T2Pro (Version < 5.3.7.t2-pro)

Exploitation Mechanism

The attack vector for this vulnerability is via an adjacent network with low complexity, requiring no user privileges or interactions.

Mitigation and Prevention

Immediate Steps to Take

Update the Lenovo Personal Cloud Storage device firmware to versions specified in the LEN-73439 product table.

Long-Term Security Practices

Implement proper access controls and authentication mechanisms to prevent unauthorized access.
Regularly monitor network traffic and device logs for any suspicious activity.

Patching and Updates

Regularly check for firmware updates and security patches for Lenovo Personal Cloud Storage devices to address known vulnerabilities.