On January 12, NSFOCUS CERT found that Apache issued a security notice to fix a remote code execution vulnerability (CVE-2021-43297) in Dubbo. Due to a deserialization vulnerability in Dubbo’s hessian-lite, an unauthenticated attacker could exploit the vulnerability to remotely execute arbitrary code on the target system. Most Dubbo users use Hessian2 as the serialization/deserialization protocol by default. When Hessian catches an exception, Hessian will log out some user information, which may lead to remote command execution. Relevant users are requested to take measures to protect them as soon as possible.
Apache Dubbo is a microservice development framework that provides two key capabilities, RPC communication and microservice governance. It enables the application to realize the output and input functions of the service through high-performance RPC, which can be seamlessly integrated with the Spring framework.
Reference link: https://lists.apache.org/thread/1mszxrvp90y01xob56yp002939c7hlww
Scope of Impact
- Apache Dubbo 2.6.x < 2.6.12
- Apache Dubbo 2.7.x < 2.7.15
- Apache Dubbo 3.0.x < 3.0.5
- Apache Dubbo = 2.6.12
- Apache Dubbo = 2.7.15
- Apache Dubbo = 3.0.5
At present, the official has released a fixed version for this vulnerability. Please take measures to upgrade the protection as soon as possible. Download link: https://github.com/apache/dubbo/releases
Upgrade reference documentation: http://dubbo.apache.org/zh-cn/docs/user/versions/version-270.html
Note: To prevent accidents, it is recommended to back up data before upgrading.
- Close the Dubbo server port open to the public network, and only allow trusted IP access.
- The Dubbo protocol uses Hessian for serialization and deserialization by default. In the case of not affecting the business, it is recommended to replace the protocol and deserialization method. For specific methods, please refer to the official documentation: http://dubbo.apache.org/zh-cn/docs/user/references/xml/dubbo-protocol.html
This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.
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