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CVE-2020-27387

8.8 · HIGH

An unrestricted file upload issue in HorizontCMS through 1.0.0-beta allows an authenticated remote attacker (with access to the FileManager) to upload and execute arbitrary PHP code by uploading a…

Published Nov 5, 2020CWE-434EPSS 18.46%

Overview

CVE-2020-27387 is a high-severity vulnerability. It was published on November 5, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

An unrestricted file upload issue in HorizontCMS through 1.0.0-beta allows an authenticated remote attacker (with access to the FileManager) to upload and execute arbitrary PHP code by uploading a PHP payload, and then using the FileManager's rename function to provide the payload (which will receive a random name on the server) with the PHP extension, and finally executing the PHP file via an HTTP GET request to /storage/<php_file_name>. NOTE: the vendor has patched this while leaving the version number at 1.0.0-beta.

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

Refpacketstormsecurity.com/files/160046/HorizontCMS-1.0.0-beta-Shell-Upload.htmlRefblog.vonahi.io/whats-in-a-re-name/GitHubgithub.com/rapid7/metasploit-framework/pull/14340GitHubgithub.com/ttimot24/HorizontCMS/commit/436b5ab679fd27afa3d99c023dbe103113da4feeRefpacketstormsecurity.com/files/160046/HorizontCMS-1.0.0-beta-Shell-Upload.htmlRefblog.vonahi.io/whats-in-a-re-name/GitHubgithub.com/rapid7/metasploit-framework/pull/14340GitHubgithub.com/ttimot24/HorizontCMS/commit/436b5ab679fd27afa3d99c023dbe103113da4fee

How CyberStrike helps

Frequently asked questions

What is CVE-2020-27387?

CVE-2020-27387 is a high-severity vulnerability. It was published on November 5, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2020-27387?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2020-27387?

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-2020-27387?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-27387 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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