CVE-2021-40531 Explained : Impact and Mitigation

This CVE-2021-40531 involves Sketch before version 75 allowing library feeds to bypass file quarantine, leading to potential remote code execution.

Understanding CVE-2021-40531

Sketch prior to version 75 is susceptible to a security issue that enables the use of library feeds to evade file quarantine mechanisms, resulting in auto-downloading and opening of files without proper attributes, which can lead to remote code execution.

What is CVE-2021-40531?

The CVE-2021-40531 vulnerability in Sketch before version 75 allows attackers to bypass file quarantine by using library feeds, ultimately leading to remote code execution.

The Impact of CVE-2021-40531

The exploitation of CVE-2021-40531 can result in remote code execution, as demonstrated by executing CommandString in a terminal profile to Terminal.app.

Technical Details of CVE-2021-40531

Sketch before version 75 vulnerability details:

Vulnerability Description

Sketch before 75 enables library feeds to be exploited for bypassing file quarantine.
This allows files to be automatically downloaded and opened without the necessary extended attribute, facilitating remote code execution.

Affected Systems and Versions

Affected Product: Not applicable
Affected Vendor: Not applicable
Affected Version: Not applicable

Exploitation Mechanism

Attackers can use library feeds to trigger automatic downloading and opening of files without the necessary file quarantine attribute, enabling the execution of malicious code remotely.

Mitigation and Prevention

Steps to mitigate the CVE-2021-40531 vulnerability:

Immediate Steps to Take

Update Sketch to version 75 or later to patch the vulnerability.
Be cautious when handling files from untrusted sources to prevent potential exploitation.

Long-Term Security Practices

Regularly update software to the latest versions to ensure security patches are in place.
Educate users on best practices for file handling and downloading to prevent security risks.

Patching and Updates

Update Sketch to version 75 or higher to fix the vulnerability and enhance overall security.