Vulnerability Description
Apache Dubbo is a java based, open source RPC framework. Versions prior to 2.6.10 and 2.7.10 are vulnerable to pre-auth remote code execution via arbitrary bean manipulation in the Telnet handler. The Dubbo main service port can be used to access a Telnet Handler which offers some basic methods to collect information about the providers and methods exposed by the service and it can even allow to shutdown the service. This endpoint is unprotected. Additionally, a provider method can be invoked using the `invoke` handler. This handler uses a safe version of FastJson to process the call arguments. However, the resulting list is later processed with `PojoUtils.realize` which can be used to instantiate arbitrary classes and invoke its setters. Even though FastJson is properly protected with a default blocklist, `PojoUtils.realize` is not, and an attacker can leverage that to achieve remote code execution. Versions 2.6.10 and 2.7.10 contain fixes for this issue.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Dubbo | < 2.6.10 |
Related Weaknesses (CWE)
References
- https://securitylab.github.com/advisories/GHSL-2021-034_043-apache-dubbo/ExploitThird Party Advisory
- https://securitylab.github.com/advisories/GHSL-2021-034_043-apache-dubbo/ExploitThird Party Advisory
FAQ
What is CVE-2021-32824?
CVE-2021-32824 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Apache Dubbo is a java based, open source RPC framework. Versions prior to 2.6.10 and 2.7.10 are vulnerable to pre-auth remote code execution via arbitrary bean manipulation in the Telnet handler. The...
How severe is CVE-2021-32824?
CVE-2021-32824 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-32824?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Dubbo.