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CVE-2021-33564

9.8 · CRITICAL

An argument injection vulnerability in the Dragonfly gem before 1.4.0 for Ruby allows remote attackers to read and write to arbitrary files via a crafted URL when the verify_url option is disabled.

Published May 29, 2021CWE-88EPSS 72.14%

Overview

CVE-2021-33564 is a critical-severity vulnerability. It was published on May 29, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An argument injection vulnerability in the Dragonfly gem before 1.4.0 for Ruby allows remote attackers to read and write to arbitrary files via a crafted URL when the verify_url option is disabled. This may lead to code execution. The problem occurs because the generate and process features mishandle use of the ImageMagick convert utility.

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

GitHubgithub.com/markevans/dragonfly/commit/25399297bb457f7fcf8e3f91e85945b255b111b5GitHubgithub.com/markevans/dragonfly/compare/v1.3.0...v1.4.0GitHubgithub.com/markevans/dragonfly/issues/513GitHubgithub.com/mlr0p/CVE-2021-33564Refraw.githubusercontent.com/projectdiscovery/nuclei-templates/master/cves/2021/CVE-2021-33564.yamlRefzxsecurity.co.nz/research/argunment-injection-ruby-dragonfly/GitHubgithub.com/markevans/dragonfly/commit/25399297bb457f7fcf8e3f91e85945b255b111b5GitHubgithub.com/markevans/dragonfly/compare/v1.3.0...v1.4.0GitHubgithub.com/markevans/dragonfly/issues/513GitHubgithub.com/mlr0p/CVE-2021-33564

How CyberStrike helps

Frequently asked questions

What is CVE-2021-33564?

CVE-2021-33564 is a critical-severity vulnerability. It was published on May 29, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2021-33564?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-33564?

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-2021-33564?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-33564 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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