CVE-2021-42852 : Vulnerability Insights and Analysis

A command injection vulnerability was reported in Lenovo Personal Cloud Storage devices, allowing authenticated users to execute OS commands.

Understanding CVE-2021-42852

What is CVE-2021-42852?

A command injection vulnerability in some Lenovo Personal Cloud Storage devices permits authenticated users to run OS commands through a crafted packet.

The Impact of CVE-2021-42852

The vulnerability has a CVSSv3.1 base score of 8 (High Severity) with high impacts on confidentiality, integrity, and availability, requiring low privileges and no user interaction.

Technical Details of CVE-2021-42852

Vulnerability Description

The vulnerability allows attackers to execute OS commands by sending a specifically crafted packet to the affected Lenovo Personal Cloud Storage devices.

Affected Systems and Versions

The following Lenovo Personal Cloud Storage devices are affected:

Personal Cloud Storage A1: Less than version 5.3.6.a1
Personal Cloud Storage T1: Less than version 5.3.6.t1
Personal Cloud Storage X1: Less than version 5.3.8.x1
Personal Cloud Storage T2: Less than version 5.3.8.t2
Personal Cloud Storage T2Pro: Less than version 5.3.7.t2-pro

Exploitation Mechanism

The vulnerability can be exploited by authenticated users sending a malicious packet, resulting in the execution of unauthorized OS commands.

Mitigation and Prevention

Immediate Steps to Take

Update the Lenovo Personal Cloud Storage device firmware to the versions provided in LEN-73439.

Long-Term Security Practices

Regularly monitor for firmware updates from Lenovo.
Implement network segmentation to limit access to the devices.

Patching and Updates

Ensure timely installation of firmware updates provided by Lenovo to mitigate the vulnerability.