CVE-2020-9296 Expression Language Injection in Netflix Conductor
Attackers can execute arbitrary Java code by injecting malicious expressions into custom constraint violation error message templates in Netflix Titus.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-9296?
CVE-2020-9296 is a critical code injection vulnerability in Netflix Titus, published on 16 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Netflix Titus 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.
Weakness: CWE-917
Which versions are affected by CVE-2020-9296?
2 open source packages ship an affected version, including com.netflix.conductor:conductor-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
com.netflix.conductor:conductor-core Maven | All versions | 2.25.4 |
com.netflix.conductor:conductor-core Maven | All versions | 2.25.4 |
Products include Netflix Conductor.
How do I fix CVE-2020-9296?
Upgrade com.netflix.conductor:conductor-core to 2.25.4 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2020-9296 being exploited?
There is no known exploitation of CVE-2020-9296 in the wild and no public exploit code.
Sources
Also known as GHSA-wfj5-2mqr-7jvv.