CVE-2020-11995 Apache Dubbo default deserialization protocol Hessian2 cause CRE
Attackers can execute arbitrary code via malicious Hessian2 deserialization in Apache Dubbo, requiring an upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-11995?
CVE-2020-11995 is a critical unsafe deserialization vulnerability in Apache Dubbo, published on 11 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2020-11995?
4 open source packages ship an affected version, including org.apache.dubbo:dubbo-parent. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.dubbo:dubbo-parent Maven | All versions | 2.6.9 |
org.apache.dubbo:dubbo-parent Maven | All versions | 2.6.9 |
org.apache.dubbo:dubbo-parent Maven | From 2.7.0 | 2.7.8 |
org.apache.dubbo:dubbo-parent Maven | From 2.7.0 | 2.7.8 |
Products include Apache Dubbo.
How do I fix CVE-2020-11995?
Upgrade org.apache.dubbo:dubbo-parent to a fixed version for your release line: 2.6.9 or 2.7.8.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2020-11995 being exploited?
There is no known exploitation of CVE-2020-11995 in the wild and no public exploit code.
Other vulnerabilities in Apache Dubbo
- CVE-2023-29234 Bypass serialize checks in Apache Dubbo
- CVE-2023-46279 Apache Dubbo: Bypass deny serialize list check in Apache Dubbo
- CVE-2021-32824 Regular expression Denial of Service in MooTools
- CVE-2022-39198 Apache Dubbo Hession Deserialization Vulnerability Gadgets Bypass
- CVE-2021-43297 Dubbo Hessian cause RCE when parse error
Sources
Also known as GHSA-74mg-6xqx-2vrq.