Vulnerability · Published May 31, 2021 · Assigned by apache
CVE-2021-30179Apache Dubbo Pre-auth RCE via Java deserialization in the Generic filter
Critical 9.8
In plain English
A critical-severity security flaw in Apache Dubbo from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.1% (higher than 91% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | com.alibaba:dubbo | 2.6.9 | GHSA-5mc7-m686-p6jg |
| Maven | org.apache.dubbo:dubbo | 2.7.10 | GHSA-5mc7-m686-p6jg |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Dubbo | Apache Dubbo 2.7.x – before 2.7.9Apache Dubbo 2.6.x – before 2.6.9 |