Apache Dubbo Introduction
Apache Dubbo is an open high-performance, light weight, Java based RPC framework. Dubbo offers three key functionalities, including interface based remote call, fault tolerance and load balancing, and automatic service registration and discovery. Its features mainly consist of the following: It adopts layered architecture to decouple all the layers, and provides service with two roles, provider and consumer.
The Apache Dubbo Provider has a deserialization vulnerability. An attacker can send an unrecognized service name or method name through an RPC request, along with some crafted data containing malicious parameters. When the malicious parameters are deserialized, it will cause remote code execution.
Vulnerability Reproduction
We build the environment of Apache Dubbo and import the project dubbo-spring-boot-project to idea, then initialize.

The figures below show malicious data is transmitted to server and executed arbitrary commands on the target server.

Affected Apache Dubbo versions:
Apache Log4j 2.7.0 - 2.7.6
Apache Dubbo 2.6.0 - 2.6.7
Apache Dubbo 2.5.x

June 23, 2020 Apache Dubbo released this vulnerability.
June 24, 2020 Sangfor FarSight Labs analyzed the vulnerability then released alerts and solutions.


Remediation Solution
1. Apache Dubbo has fixed this vulnerability. Please visit the following link to download the latest version.

Download address:

Sangfor Solution
For Sangfor NGAF customers, keep NGAF security protection rules up to date.

Sangfor Cloud WAF has automatically updated its database in the cloud. Those users are already protected from this vulnerability without needing to perform any additional operations.

Sangfor Cyber Command is capable of detecting attacks which exploit this vulnerability and can alert users in real time. Users can correlate Cyber Command to Sangfor NGAF to block an attacker's IP address.

Sangfor SOC makes sure that Sangfor security specialists are available 24/7 to you for any security issue. Sangfor security experts scan the customer's network environment in the first place to ensure that the customer's host is free from this vulnerability. For users with vulnerabilities, we reviewed and updated device policies to ensure protection capability against this vulnerability.

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