CVE-2021-32824: Dubbo parent Remote Code Execution Vulnerability
CRITICALCVE-2021-32824 is a CRITICAL (CVSS 9.8) remote code execution vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Dubbo parent libraries in the Maven ecosystem. The issue involves apache dubbo vulnerable to remote code execution via telnet handler. Remediation is available by upgrading affected packages to version 2.6.10, 2.7.10.
CVE-2021-32824 at a Glance
Security Impact
CVSS: 9.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2021-32824
To remediate this vulnerability, upgrade all affected Dubbo parent dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-parent</artifactId>
<version>2.6.10</version>
</dependency><dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-parent</artifactId>
<version>2.7.10</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.apache.dubboHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2021-32824, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.apache.dubboAnalyze the terminal output to locate any version of Dubbo parent in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.6.10), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.apache.dubbo command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Dubbo parent, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2021-32824 Affected Dubbo parent Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.apache.dubbo:dubbo-parent
|
Maven |
< 2.6.10
|
2.6.10
|
|
org.apache.dubbo:dubbo-parent
|
Maven |
≥ 2.7.0
< 2.7.10
|
2.7.10
|
References
Frequently Asked Questions
What is CVE-2021-32824?
Which Dubbo parent versions are affected?
What version fixes CVE-2021-32824?
Is dubbo-parent affected?
What is the CVSS score of CVE-2021-32824?
What CWE is associated with CVE-2021-32824?
How can I check Maven dependencies for CVE-2021-32824?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-fprr-rrm8-4534",
"modified" : "2023-01-05T12:03:28Z",
"published" : "2023-01-03T18:30:25Z",
"aliases" : [ "CVE-2021-32824" ],
"summary" : "Apache Dubbo vulnerable to remote code execution via Telnet Handler",
"details" : "Apache Dubbo is a Java based, open source RPC framework. Versions prior to 2.6.10 and 2.7.10 are vulnerable to pre-authorization 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. \n\nAdditionally, 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. \n\nVersions 2.6.10 and 2.7.10 contain fixes for this issue.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.apache.dubbo:dubbo-parent"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.6.10"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.apache.dubbo:dubbo-parent"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.7.0"
}, {
"fixed" : "2.7.10"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-32824"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/apache/dubbo"
}, {
"type" : "ADVISORY",
"url" : "https://securitylab.github.com/advisories/GHSL-2021-034_043-apache-dubbo"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-502" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2023-01-05T12:03:28Z",
"nvd_published_at" : "2023-01-03T18:15:00Z"
}
}