Server-side Template Injection (SSTI) Affecting org.freemarker:freemarker package, versions [,2.3.30)


0.0
high
  • Exploit Maturity

    Proof of concept

  • Attack Complexity

    High

  • Confidentiality

    High

  • Integrity

    High

  • Availability

    High

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  • snyk-id

    SNYK-JAVA-ORGFREEMARKER-1076795

  • published

    19 Feb 2021

  • disclosed

    9 Apr 2020

  • credit

    Ackcent

How to fix?

Upgrade org.freemarker:freemarker to version 2.3.30 or higher.

Overview

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.