CVE-2021-39636: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-35xq-5wph-pxqw
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CVSS 4.4
CWE-909
Published
Advisory Summary

CVE-2021-39636 is a MODERATE (CVSS 4.4) security vulnerability vulnerability (CWE-909: Missing Initialization of Resource) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not initialize a critical resource.. Remediation is available in the latest vendor maintenance releases.

CVE-2021-39636 at a Glance

CVE Identifier CVE-2021-39636
GHSA Identifier GHSA-35xq-5wph-pxqw
Severity MODERATE
CVSS v3.1 Base Score 4.4
CWE Classification CWE-909: Missing Initialization of Resource
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.4

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

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

How to Fix CVE-2021-39636

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-2021-39636, 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-909: Missing Initialization of Resource, where the product does not initialize a critical resource. 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 do_ipt_get_ctl and do_ipt_set_ctl of ip_tables.c, there is a possible way to leak kernel information due to uninitialized data. This could lead to local information disclosure with system execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-120612905References: Upstream kernel

References

NVD — CVE-2021-39636 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-39636
Software Security Information SECURITY
https://source.android.com/security/bulletin/pixel/2021-12-01

Frequently Asked Questions

What is CVE-2021-39636?
CVE-2021-39636 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-909: Missing Initialization of Resource.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2021-39636?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2021-39636?
CVE-2021-39636 has a CVSS v3.1 base score of 4.4 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2021-39636?
CVE-2021-39636 is classified under CWE-909: Missing Initialization of Resource (The product does not initialize a critical resource.).
How can I check Maven dependencies for CVE-2021-39636?
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-35xq-5wph-pxqw",
  "modified" : "2022-07-13T00:01:37Z",
  "published" : "2021-12-16T00:00:43Z",
  "aliases" : [ "CVE-2021-39636" ],
  "details" : "In do_ipt_get_ctl and do_ipt_set_ctl of ip_tables.c, there is a possible way to leak kernel information due to uninitialized data. This could lead to local information disclosure with system execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-120612905References: Upstream kernel",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-39636"
  }, {
    "type" : "WEB",
    "url" : "https://source.android.com/security/bulletin/pixel/2021-12-01"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-909" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2021-12-15T19:15:00Z"
  }
}