CVE-2020-9297

14.07.2020, 20:15

Netflix Titus, all versions prior to version v0.1.1-rc.274, uses Java Bean Validation (JSR 380) 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.

Expression Language Injection

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	9.8 CRITICAL	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
netflix	CNA	---				---
CVE	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 65%

Vendor	Product	Version
netflix	titus	𝑥 ≤ 0.1.0
netflix	titus	0.1.1
netflix	titus	0.1.1:rc244
netflix	titus	0.1.1:rc260
netflix	titus	0.1.1:rc261
netflix	titus	0.1.1:rc262
netflix	titus	0.1.1:rc263
netflix	titus	0.1.1:rc264
netflix	titus	0.1.1:rc265
netflix	titus	0.1.1:rc266
netflix	titus	0.1.1:rc267
netflix	titus	0.1.1:rc268
netflix	titus	0.1.1:rc269
netflix	titus	0.1.1:rc270
netflix	titus	0.1.1:rc271
netflix	titus	0.1.1:rc272
netflix	titus	0.1.1:rc273

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-917 - Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
The software constructs all or part of an expression language (EL) statement in a framework such as a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.

References

https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2020-002.md