title: Apache Dubbo default deserialization protocol Hessian2 cause CRE
description: A deserialization vulnerability existed in dubbo 2.7.5 and its earlier versions, which could lead to malicious code execution. Most Dubbo users use Hessian2 as the default serialization/deserialization protool, during Hessian2 deserializing the HashMap object, some functions in the classes stored in HasMap will be executed after a series of program calls, however, those special functions may cause remote command execution. For example, the hashCode() function of the EqualsBean class in rome-1.7.0.jar will cause the remotely load malicious classes and execute malicious code by constructing a malicious request. This issue was fixed in Apache Dubbo 2.6.9 and 2.7.8.
problem types: CWE-502 Deserialization of Untrusted Data
affected:
{
product: Apache Dubbo
vendor: Apache Software Foundation
versions:
changes: [at: 2.7.8, status: unaffected], lessThan: 2.6.9, status: affected, version: Apache Dubbo, versionType: custom
}