Server-side Template Injection (SSTI) Affecting org.freemarker:freemarker package, versions [,2.3.30)
Proof of concept
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19 Feb 2021
9 Apr 2020
How to fix?
org.freemarker:freemarker to version 2.3.30 or higher.
org.freemarker:freemarker is a "template engine"; a generic tool to generate text output (anything from HTML to auto generated source code) based on templates.
Affected versions of this package are vulnerable to Server-side Template Injection (SSTI). By allowing user input into
java.security.ProtectionDomain.getClassLoader, templates will get access to the java classloader. This can be further leveraged for file system access and code execution. A low-privileged user is sufficient for exploitation of this vulnerability.