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CVE-2021-42387

8.1 · HIGH

Heap out-of-bounds read in Clickhouse's LZ4 compression codec when parsing a malicious query.

Published Mar 14, 2022CWE-125EPSS 1.57%

Overview

CVE-2021-42387 is a high-severity vulnerability. It was published on March 14, 2022 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Heap out-of-bounds read in Clickhouse's LZ4 compression codec when parsing a malicious query. As part of the LZ4::decompressImpl() loop, a 16-bit unsigned user-supplied value ('offset') is read from the compressed data. The offset is later used in the length of a copy operation, without checking the upper bounds of the source of the copy operation.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refjfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbmsReflists.debian.org/debian-lts-announce/2022/11/msg00002.htmlRefjfrog.com/blog/7-rce-and-dos-vulnerabilities-found-in-clickhouse-dbmsReflists.debian.org/debian-lts-announce/2022/11/msg00002.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-42387?

CVE-2021-42387 is a high-severity vulnerability. It was published on March 14, 2022 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-42387?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-42387?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-42387?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-42387 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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