Dropwizard-Validation before 1.3.19, and 2.0.2 may allow arbitrary code execution on the host system, with the privileges of the Dropwizard service account, by injecting arbitrary Java Expression Language expressions when using the self-validating feature.

Summary

A server-side template injection was identified in the self-validating (@SelfValidating) feature of dropwizard-validation enabling attackers to inject arbitrary Java EL expressions, leading to Remote Code Execution (RCE) vulnerability.

If you're using a self-validating bean (via @SelfValidating), an upgrade to Dropwizard 1.3.19 or 2.0.2 is strongly recommended.

Impact

This issue may allow Remote Code Execution (RCE), allowing to run arbitrary code on the host system (with the privileges of the Dropwizard service account privileges) by injecting arbitrary Java Expression Language (EL) expressions when using the self-validating feature (@SelfValidating, @SelfValidation) in dropwizard-validation.

Patches

The issue has been fixed in dropwizard-validation 1.3.19 and 2.0.2. We strongly recommend upgrading to one of these versions.

Workarounds

If you are not able to upgrade to one of the aforementioned versions of dropwizard-validation but still want to use the @SelfValidating feature, make sure to properly sanitize any message you're adding to the ViolationCollector in the method annotated with @SelfValidation.

Example: java @SelfValidation public void validateFullName(ViolationCollector col) { if (fullName.contains("")) { // Sanitize fullName variable by escaping relevant characters such as "$" col.addViolation("Full name contains invalid characters: " + sanitizeJavaEl(fullName)); } }

See also: https://github.com/dropwizard/dropwizard/blob/v2.0.2/dropwizard-validation/src/main/java/io/dropwizard/validation/selfvalidating/ViolationCollector.java#L84-L98

References

https://github.com/dropwizard/dropwizard/pull/3157 https://github.com/dropwizard/dropwizard/pull/3160 https://docs.oracle.com/javaee/7/tutorial/jsf-el.htm https://docs.jboss.org/hibernate/validator/6.1/reference/en-US/htmlsingle/#section-interpolation-with-message-expressions https://beanvalidation.org/2.0/spec/#validationapi-message-defaultmessageinterpolation

For more information

If you have any questions or comments about this advisory: Open an issue in dropwizard/dropwizard Start a discussion on the dropwizard-dev mailing list

Security contact

If you want to responsibly disclose a security issue in Dropwizard or one of its official modules, please contact us via the published channels in our security policy:

https://github.com/dropwizard/dropwizard/security/policy#reporting-a-vulnerability

dropwizard-validation before versions 2.0.3 and 1.3.21 has a remote code execution vulnerability. A server-side template injection was identified in the self-validating feature enabling attackers to inject arbitrary Java EL expressions, leading to Remote Code Execution (RCE) vulnerability. If you are using a self-validating bean an upgrade to Dropwizard 1.3.21/2.0.3 or later is strongly recommended. The changes introduced in Dropwizard 1.3.19 and 2.0.2 for CVE-2020-5245 unfortunately did not fix the underlying issue completely. The issue has been fixed in dropwizard-validation 1.3.21 and 2.0.3 or later. We strongly recommend upgrading to one of these versions.