CVE-2020-1948 Deserialization of Untrusted Data in Apache Dubbo

What is CVE-2020-1948?

CVE-2020-1948 is a critical unsafe deserialization vulnerability in Apache Dubbo, published on 14 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

This vulnerability can affect all Dubbo users stay on version 2.7.6 or lower. An attacker can send RPC requests with unrecognized service name or method name along with some malicious parameter payloads. When the malicious parameter is deserialized, it will execute some malicious code. More details can be found below.

Weakness: CWE-502

Which versions are affected by CVE-2020-1948?

4 open source packages ship an affected version, including org.apache.dubbo:dubbo and org.apache.dubbo:dubbo-common. It affects 1 product.

Products include Apache Dubbo.

How do I fix CVE-2020-1948?

Upgrade org.apache.dubbo:dubbo to 2.7.7 or later.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2020-1948 being exploited?

There is no known exploitation of CVE-2020-1948 in the wild and no public exploit code.

Public exploit code: 4 proofs of concept on GitHub.

Other vulnerabilities in Apache Dubbo

• CVE-2023-29234 Bypass serialize checks in Apache Dubbo Critical 9.8
• CVE-2023-46279 Apache Dubbo: Bypass deny serialize list check in Apache Dubbo Critical 9.8
• CVE-2021-32824 Regular expression Denial of Service in MooTools Critical 9.8
• CVE-2022-39198 Apache Dubbo Hession Deserialization Vulnerability Gadgets Bypass Critical 9.8
• CVE-2021-43297 Dubbo Hessian cause RCE when parse error Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-whww-v56c-cgv2.