CVE-2021-29440: Improper Control of Generation of Code ('Code Injection')

April 16, 2021 (updated July 13, 2021)

Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance. The issue was addressed in version 1.7.11.

References

packetstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.html
github.com/advisories/GHSA-g8r4-p96j-xfxc
github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc
nvd.nist.gov/vuln/detail/CVE-2021-29440
packagist.org/packages/getgrav/grav

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