CVE-2022-22846: Dnslib Dnslib Has DNS Reply Verification Vulnerability

HIGH
Advisory Identifier: GHSA-r478-c2pc-m7gx
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CVSS 7.5
CWE-345
Published
Advisory Summary

CVE-2022-22846 is a HIGH (CVSS 7.5) dnslib has dns reply verification vulnerability (CWE-345: Insufficient Verification of Data Authenticity) affecting Dnslib libraries in the PyPI ecosystem. The issue involves dnslib has dns reply verification issue. Remediation is available by upgrading affected packages to version 0.9.17.

CVE-2022-22846 at a Glance

CVE Identifier CVE-2022-22846
GHSA Identifier GHSA-r478-c2pc-m7gx
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-345: Insufficient Verification of Data Authenticity
Affected Product Dnslib
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/I:H/A:N).

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 None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2022-22846

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

dnslib fixed: 0.9.17 
pip install dnslib>=0.9.17
Verify Direct and Transitive Dependencies

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

pip show dnslib

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2022-22846, inspect your installed packages using pip:

pip show dnslib

Analyze the terminal output to locate any version of Dnslib in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.9.17), your application is affected.

Note: The pip show dnslib command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-345: Insufficient Verification of Data Authenticity, where the product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. In Dnslib, 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

The dnslib package through 0.9.16 for Python does not verify that the ID value in a DNS reply matches an ID value in a query.

CVE-2022-22846 Affected Dnslib Versions

1 component(s)
Fixed Versions:
0.9.17
Product / Package Ecosystem Affected Versions Fixed Version
dnslib
pypi/dnslib
PyPI
< 0.9.17
0.9.17

References

NVD — CVE-2022-22846 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-22846
Dnslib Source Repository REPOSITORY
https://github.com/paulc/dnslib/issues/30
Security Fix Commit FIX COMMIT
https://github.com/paulc/dnslib/commit/76e8677699ed098387d502c57980f58da642aeba
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-r478-c2pc-m7gx
Dnslib Source Repository REPOSITORY
https://github.com/paulc/dnslib
Dnslib Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/dnslib/PYSEC-2022-4.yaml

Frequently Asked Questions

What is CVE-2022-22846?
CVE-2022-22846 is a security vulnerability in Dnslib involving dnslib has DNS reply verification issue under CWE-345: Insufficient Verification of Data Authenticity.
Which Dnslib versions are affected?
Affected versions include releases prior to 0.9.17 across affected packages: dnslib.
What version fixes CVE-2022-22846?
Upgrading to 0.9.17 (or the latest patched release for your respective branch) resolves the vulnerability.
Is dnslib affected?
Yes, dnslib is affected in releases prior to 0.9.17. Upgrade your dependency to 0.9.17 or later.
What is the CVSS score of CVE-2022-22846?
CVE-2022-22846 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2022-22846?
CVE-2022-22846 is classified under CWE-345: Insufficient Verification of Data Authenticity (The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.).
How can I check PyPI dependencies for CVE-2022-22846?
Run the dependency tree command: 'pip show dnslib'. 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-r478-c2pc-m7gx",
  "modified" : "2024-09-18T20:06:40Z",
  "published" : "2022-01-12T20:07:10Z",
  "aliases" : [ "CVE-2022-22846" ],
  "summary" : "dnslib has DNS reply verification issue",
  "details" : "The dnslib package through 0.9.16 for Python does not verify that the ID value in a DNS reply matches an ID value in a query.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "dnslib"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.9.17"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-22846"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/paulc/dnslib/issues/30"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/paulc/dnslib/commit/76e8677699ed098387d502c57980f58da642aeba"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-r478-c2pc-m7gx"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/paulc/dnslib"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/dnslib/PYSEC-2022-4.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-345" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-11T18:25:47Z",
    "nvd_published_at" : "2022-01-10T14:12:00Z"
  }
}