CVE-2021-30179: Apache Dubbo Pre-auth RCE via Java deserialization in the Generic filter
First published: Mon May 31 2021(Updated: )
Apache Dubbo prior to 2.6.9 and 2.7.9 by default supports generic calls to arbitrary methods exposed by provider interfaces. These invocations are handled by the GenericFilter which will find the service and method specified in the first arguments of the invocation and use the Java Reflection API to make the final call. The signature for the $invoke or $invokeAsync methods is Ljava/lang/String;[Ljava/lang/String;[Ljava/lang/Object; where the first argument is the name of the method to invoke, the second one is an array with the parameter types for the method being invoked and the third one is an array with the actual call arguments. In addition, the caller also needs to set an RPC attachment specifying that the call is a generic call and how to decode the arguments. The possible values are: - true - raw.return - nativejava - bean - protobuf-json An attacker can control this RPC attachment and set it to nativejava to force the java deserialization of the byte array located in the third argument.
Credit: security@apache.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Apache Dubbo | >=2.5.0<=2.5.10 | |
| Apache Dubbo | >=2.6.0<2.6.9 | |
| Apache Dubbo | >=2.7.0<2.7.10 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-30179?
The severity of CVE-2021-30179 is critical with a CVSS score of 9.8.
Which versions of Apache Dubbo are affected by CVE-2021-30179?
Apache Dubbo versions 2.5.0 to 2.5.10, 2.6.0 to 2.6.9, and 2.7.0 to 2.7.10 are affected by CVE-2021-30179.
What is the vulnerability in Apache Dubbo prior to 2.6.9 and 2.7.9?
Apache Dubbo prior to 2.6.9 and 2.7.9 by default supports generic calls to arbitrary methods exposed by provider interfaces.
How does the GenericFilter handle the invocations in Apache Dubbo?
The GenericFilter in Apache Dubbo finds the service and method specified in the first arguments of the invocation and uses the Java Reflection API to handle the invocations.
Is there a fix available for CVE-2021-30179?
Yes, the fix for CVE-2021-30179 is available in Apache Dubbo versions 2.6.9 and 2.7.9.
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- vendor/apache
- canonical/apache dubbo
- version/apache dubbo/2.5.0
- version/apache dubbo/2.5.10
- version/apache dubbo/2.6.0
- version/apache dubbo/2.7.0