CVE-2021-30181 Apache Dubbo RCE on customers via Script route poisoning (Nashorn script injection)

What is CVE-2021-30181?

CVE-2021-30181 is a critical code injection vulnerability in Apache Dubbo, published on 29 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Apache Dubbo prior to 2.6.9 and 2.7.9 supports Script routing which will enable a customer to route the request to the right server. These rules are used by the customers when making a request in order to find the right endpoint. When parsing these rules, Dubbo customers use ScriptEngine and run the rule provided by the script which by default may enable executing arbitrary code.

Which versions are affected by CVE-2021-30181?

4 open source packages ship an affected version, including org.apache.dubbo:dubbo and com.alibaba:dubbo. It affects 1 product.

Products include Apache Dubbo.

How do I fix CVE-2021-30181?

Upgrade org.apache.dubbo:dubbo to 2.7.10 or later.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2021-30181 being exploited?

There is no known exploitation of CVE-2021-30181 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Apache Dubbo

• CVE-2023-29234 Bypass serialize checks in Apache Dubbo Critical 9.8
• CVE-2023-46279 Apache Dubbo: Bypass deny serialize list check in Apache Dubbo Critical 9.8
• CVE-2021-32824 Regular expression Denial of Service in MooTools Critical 9.8
• CVE-2022-39198 Apache Dubbo Hession Deserialization Vulnerability Gadgets Bypass Critical 9.8
• CVE-2021-43297 Dubbo Hessian cause RCE when parse error Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qmfc-6www-fjqw.