CVE-2020-21125: Ureport2 core Remote Code Execution Vulnerability

CRITICAL

Advisory Identifier: GHSA-729f-wvj3-c4pj

CVSS 9.8

Published 2021-09-20

Advisory Summary

CVE-2020-21125 is a CRITICAL (CVSS 9.8) remote code execution vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Ureport2 core libraries in the Maven ecosystem. The issue involves remote code execution in ureport. Remediation is available in the latest vendor maintenance releases.

CVE-2020-21125 at a Glance

CVE Identifier CVE-2020-21125

GHSA Identifier GHSA-729f-wvj3-c4pj

Severity CRITICAL

CVSS v3.1 Base Score 9.8

CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Product Ureport2 core

Package Ecosystem Maven

Published Date 2021-09-20

Last Updated 2023-09-26

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-2020-21125

To remediate this vulnerability, upgrade all affected Ureport2 core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

com.bstek.ureport:ureport2-core fixed: Latest secure release

<dependency>
    <groupId>com.bstek.ureport</groupId>
    <artifactId>ureport2-core</artifactId>
    <version>Latest secure release</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=com.bstek.ureport

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-21125, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=com.bstek.ureport

Analyze the terminal output to locate any version of Ureport2 core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree -Dincludes=com.bstek.ureport 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Ureport2 core, 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

An arbitrary file creation vulnerability in UReport 2.2.9 allows attackers to execute arbitrary code.

CVE-2020-21125 Affected Ureport2 core Versions

1 component(s)

Product / Package	Ecosystem	Affected Versions	Fixed Version
com.bstek.ureport:ureport2-core maven/com.bstek.ureport/ureport2-core	Maven	≤ 2.2.9

References

NVD — CVE-2020-21125 NVD

https://nvd.nist.gov/vuln/detail/CVE-2020-21125

Ureport2 core Source Repository REPOSITORY

https://github.com/youseries/ureport/issues/485

Ureport2 core Source Repository REPOSITORY

https://github.com/youseries/ureport

Frequently Asked Questions

What is CVE-2020-21125?

CVE-2020-21125 is a security vulnerability in Ureport2 core involving Remote code execution in UReport under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').

Which Ureport2 core versions are affected?

Affected versions include releases prior to current release patches across affected packages: com.bstek.ureport:ureport2-core.

What version fixes CVE-2020-21125?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

Is ureport2-core affected?

Yes, com.bstek.ureport:ureport2-core is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

What is the CVSS score of CVE-2020-21125?

CVE-2020-21125 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-2020-21125?

CVE-2020-21125 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).

How can I check Maven dependencies for CVE-2020-21125?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=com.bstek.ureport'. 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-729f-wvj3-c4pj",
  "modified" : "2023-09-26T17:31:51Z",
  "published" : "2021-09-20T20:45:03Z",
  "aliases" : [ "CVE-2020-21125" ],
  "summary" : "Remote code execution in UReport",
  "details" : "An arbitrary file creation vulnerability in UReport 2.2.9 allows attackers to execute arbitrary code.",
  "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" : "com.bstek.ureport:ureport2-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.2.9"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-21125"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/youseries/ureport/issues/485"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/youseries/ureport"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-09-16T18:50:53Z",
    "nvd_published_at" : "2021-09-15T17:15:00Z"
  }
}

CVSS V3

9.8 CRITICAL