CVE-2021-42387 : Vulnerability Insights and Analysis

CVE-2021-42387, assigned by JFROG, involves a heap out-of-bounds read vulnerability in Clickhouse's LZ4 compression codec. This CVE was published on March 14, 2022.

Understanding CVE-2021-42387

This section provides an overview and impact of the CVE-2021-42387 vulnerability.

What is CVE-2021-42387?

The vulnerability occurs in Clickhouse's LZ4 compression codec when parsing a malicious query. It stems from the handling of a user-supplied value ('offset') within the LZ4::decompressImpl() loop.

The Impact of CVE-2021-42387

Exploitation of this vulnerability could result in a heap out-of-bounds read, potentially leading to unauthorized access or sensitive data exposure.

Technical Details of CVE-2021-42387

Explore the technical aspects of CVE-2021-42387 and its implications.

Vulnerability Description

The issue arises from an unchecked user-supplied value ('offset') used in a copy operation length, allowing an out-of-bounds read.

Affected Systems and Versions

Vendor: Yandex
Product: Clickhouse
Affected Versions: unspecified to 21.10.2.15-stable (custom version)

Exploitation Mechanism

The vulnerability can be exploited by manipulating the 'offset' value in the compressed data to trigger the out-of-bounds read.

Mitigation and Prevention

Learn about the steps to mitigate and prevent CVE-2021-42387.

Immediate Steps to Take

Apply patches provided by the vendor promptly.
Monitor security advisories for updates related to this vulnerability.

Long-Term Security Practices

Regularly update software and dependencies to stay protected against known vulnerabilities.
Implement network controls and access restrictions to limit potential attack surfaces.

Patching and Updates

Ensure timely application of security patches and follow best practices for secure software development.