Description
Grav is a file-based Web platform. Prior to 1.8.0-beta.27, Grav CMS is vulnerable to a Server-Side Template Injection (SSTI) that allows any authenticated user with editor permissions to execute arbitrary code on the remote server, bypassing the existing security sandbox. Since the security sandbox does not fully protect the Twig object, it is possible to interact with it (e.g., call methods, read/write attributes) through maliciously crafted Twig template directives injected into a web page. This allows an authenticated editor to add arbitrary functions to the Twig attribute system.twig.safe_filters, effectively bypassing the Grav CMS sandbox. This vulnerability is fixed in 1.8.0-beta.27.
Problem types
CWE-94: Improper Control of Generation of Code ('Code Injection')
CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
Product status
References
github.com/...v/grav/security/advisories/GHSA-gjc5-8cfh-653x
github.com/...ommit/e37259527d9c1deb6200f8967197a9fa587c6458
