CVE-2021-40647: Software Security Vulnerability Vulnerability

MODERATE

Advisory Identifier: GHSA-p3mv-74p6-4mgc

CVSS 5.5

Published 2022-09-10

Advisory Summary

CVE-2021-40647 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (CWE-20: Improper Input Validation) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.. Remediation is available in the latest vendor maintenance releases.

CVE-2021-40647 at a Glance

CVE Identifier CVE-2021-40647

GHSA Identifier GHSA-p3mv-74p6-4mgc

Severity MODERATE

CVSS v3.1 Base Score 5.5

CWE Classification CWE-20: Improper Input Validation

Affected Product Software

Package Ecosystem Maven

Published Date 2022-09-10

Last Updated 2022-09-15

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).

Attack Vector Local (AV:L)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction Required (UI:R)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability High (A:H)

How to Fix CVE-2021-40647

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

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

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-40647, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software 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 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Software, 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

In man2html 1.6g, a specific string being read in from a file will overwrite the size parameter in the top chunk of the heap. This at least causes the program to segmentation abort if the heap size parameter isn't aligned correctly. In version before GLIBC version 2.29 and aligned correctly, it allows arbitrary write anywhere in the programs memory.

References

NVD — CVE-2021-40647 NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-40647

Software Source Repository REPOSITORY

https://gist.github.com/untaman/cb58123fe89fc65e3984165db5d40933

Frequently Asked Questions

What is CVE-2021-40647?

CVE-2021-40647 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-20: Improper Input Validation.

Which Software versions are affected?

Affected versions include releases prior to current release patches.

What version fixes CVE-2021-40647?

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

What is the CVSS score of CVE-2021-40647?

CVE-2021-40647 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

What CWE is associated with CVE-2021-40647?

CVE-2021-40647 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).

How can I check Maven dependencies for CVE-2021-40647?

Run the dependency tree command: 'mvn dependency:tree'. 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-p3mv-74p6-4mgc",
  "modified" : "2022-09-15T00:00:18Z",
  "published" : "2022-09-10T00:00:25Z",
  "aliases" : [ "CVE-2021-40647" ],
  "details" : "In man2html 1.6g, a specific string being read in from a file will overwrite the size parameter in the top chunk of the heap. This at least causes the program to segmentation abort if the heap size parameter isn't aligned correctly. In version before GLIBC version 2.29 and aligned correctly, it allows arbitrary write anywhere in the programs memory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-40647"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/untaman/cb58123fe89fc65e3984165db5d40933"
  }, {
    "type" : "WEB",
    "url" : "http://man2html.com"
  }, {
    "type" : "WEB",
    "url" : "http://na.com"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2022-09-09T18:15:00Z"
  }
}

CVSS V3

5.5 MODERATE