On June 23, NSFOCUS reported that Apache Dubbo contained a remote code execution vulnerability (CVE-2020-1948) resulting from deserialization.
Apache Dubbo is a high-performance Java RPC framework. The vulnerability exists in Hessian, a default deserialization tool used by Apache Dubbo. An attacker may exploit it by sending malicious RPC requests which usually contain unidentifiable service or method names and some malicious parameter loads. When malicious parameters are deserialized, the vulnerability is triggered, allowing the attackers to remotely execute code.
The vendor released Version 2.7.7 to fix the vulnerability, but to no avail. It turns out that the patch can be bypassed, leaving the framework still vulnerable. At present, the vendor has not released any new patch against this 0-day vulnerability.
Dubbo Version <= 2.7.7
The vendor has not released the latest version. Users should stay tuned.
Users can take the following temporary measures:
- Restrict access to the Dubbo service to trusted IP addresses only;
- Since the vulnerability results from the deserialization process of Hessian, try using other deserialization ways instead provided that this does not affect your own business.
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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