CVE-2020-9296: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

February 10, 2022

Netflix Titus uses Java Bean Validation (JSR ) custom constraint validators. When building custom constraint violation error messages, different types of interpolation are supported, including Java EL expressions. If an attacker can inject arbitrary data in the error message template being passed to ConstraintValidatorContext.buildConstraintViolationWithTemplate() argument, they will be able to run arbitrary Java code.

References

github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2020-001.md
github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2020-002.md
github.com/advisories/GHSA-wfj5-2mqr-7jvv
nvd.nist.gov/vuln/detail/CVE-2020-9296

Detect and mitigate CVE-2020-9296 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →