CVE-2021-45029: Shenyu common Code Injection Vulnerability

CRITICAL
Advisory Identifier: GHSA-gh38-x2wm-xmc8
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CVSS 9.8
CWE-94
Published
Advisory Summary

CVE-2021-45029 is a CRITICAL (CVSS 9.8) code injection vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Shenyu common libraries in the Maven ecosystem. The issue involves code injection in shenyu. Remediation is available by upgrading affected packages to version 2.4.2.

CVE-2021-45029 at a Glance

CVE Identifier CVE-2021-45029
GHSA Identifier GHSA-gh38-x2wm-xmc8
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product Shenyu common
Package Ecosystem Maven
Published Date
Last Updated

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).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-45029

To remediate this vulnerability, upgrade all affected Shenyu common dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.shenyu:shenyu-common fixed: 2.4.2 
<dependency>
    <groupId>org.apache.shenyu</groupId>
    <artifactId>shenyu-common</artifactId>
    <version>2.4.2</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.shenyu

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-45029, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.shenyu

Analyze the terminal output to locate any version of Shenyu common in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.4.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.shenyu 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-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Shenyu common, 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

Groovy Code Injection & SpEL Injection which lead to Remote Code Execution. This issue affected Apache ShenYu 2.4.0 and 2.4.1.

CVE-2021-45029 Affected Shenyu common Versions

1 component(s)
Fixed Versions:
2.4.2
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.shenyu:shenyu-common
maven/org.apache.shenyu/shenyu-common
Maven
≥ 2.4.0
< 2.4.2
2.4.2

References

NVD — CVE-2021-45029 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45029
Shenyu common Source Repository REPOSITORY
https://github.com/apache/incubator-shenyu
lists.apache.org/thread/3zzmwvg3012t... WEB
https://lists.apache.org/thread/3zzmwvg3012tg306x8o893fvdcssx639
Shenyu common Security Information SECURITY
http://www.openwall.com/lists/oss-security/2022/01/25/8
Shenyu common Security Information SECURITY
http://www.openwall.com/lists/oss-security/2022/01/26/1

Frequently Asked Questions

What is CVE-2021-45029?
CVE-2021-45029 is a security vulnerability in Shenyu common involving Code injection in ShenYu under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which Shenyu common versions are affected?
Affected versions include releases prior to 2.4.2 across affected packages: org.apache.shenyu:shenyu-common.
What version fixes CVE-2021-45029?
Upgrading to 2.4.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is shenyu-common affected?
Yes, org.apache.shenyu:shenyu-common is affected in releases prior to 2.4.2. Upgrade your dependency to 2.4.2 or later.
What is the CVSS score of CVE-2021-45029?
CVE-2021-45029 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-45029?
CVE-2021-45029 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).
How can I check Maven dependencies for CVE-2021-45029?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.shenyu'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-gh38-x2wm-xmc8",
  "modified" : "2022-01-31T21:45:30Z",
  "published" : "2022-01-28T22:13:27Z",
  "aliases" : [ "CVE-2021-45029" ],
  "summary" : "Code injection in ShenYu",
  "details" : "Groovy Code Injection & SpEL Injection which lead to Remote Code Execution. This issue affected Apache ShenYu 2.4.0 and 2.4.1.",
  "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.shenyu:shenyu-common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.4.0"
      }, {
        "fixed" : "2.4.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-45029"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/incubator-shenyu"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/3zzmwvg3012tg306x8o893fvdcssx639"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2022/01/25/8"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2022/01/26/1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-26T22:40:21Z",
    "nvd_published_at" : "2022-01-25T13:15:00Z"
  }
}