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CVE-2023-37897

7.2 · HIGH

Grav is a file-based Web-platform built in PHP.

Published Jul 18, 2023CWE-74EPSS 2.81%

Overview

CVE-2023-37897 is a high-severity vulnerability. It was published on July 18, 2023 and has a CVSS 3.1 base score of 7.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.2, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Grav is a file-based Web-platform built in PHP. Grav is subject to a server side template injection (SSTI) vulnerability. The fix for another SSTI vulnerability using `|map`, `|filter` and `|reduce` twigs implemented in the commit `71bbed1` introduces bypass of the denylist due to incorrect return value from `isDangerousFunction()`, which allows to execute the payload prepending double backslash (`\\`). The `isDangerousFunction()` check in version 1.7.42 and onwards retuns `false` value instead of `true` when the `\` symbol is found in the `$name`. This vulnerability can be exploited if the attacker has access to: 1. an Administrator account, or 2. a non-administrator, user account that has Admin panel access and Create/Update page permissions. A fix for this vulnerability has been introduced in commit `b4c6210` and is included in release version `1.7.42.2`. Users are advised to upgrade. There are no known workarounds for this vulnerability.

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/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1bGitHubgithub.com/getgrav/grav/commit/b4c62101a43051fc7f5349c7d0a5b6085375c1d7GitHubgithub.com/getgrav/grav/security/advisories/GHSA-9436-3gmp-4f53GitHubgithub.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1bGitHubgithub.com/getgrav/grav/commit/b4c62101a43051fc7f5349c7d0a5b6085375c1d7GitHubgithub.com/getgrav/grav/security/advisories/GHSA-9436-3gmp-4f53

How CyberStrike helps

Frequently asked questions

What is CVE-2023-37897?

CVE-2023-37897 is a high-severity vulnerability. It was published on July 18, 2023 and has a CVSS 3.1 base score of 7.2 (HIGH).

How severe is CVE-2023-37897?

This vulnerability has a CVSS 3.1 base score of 7.2, 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-2023-37897?

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-2023-37897?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-37897 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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