CVE-2021-40323: Cobbler Cobbler Before 3.3.0 Allows Log Vulnerability

HIGH
Advisory Identifier: GHSA-cpqf-3c3r-c9g2
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CVSS 9.8
CWE-94
Published
Advisory Summary

CVE-2021-40323 is a HIGH (CVSS 9.8) cobbler before 3.3.0 allows log vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Cobbler libraries in the PyPI ecosystem. The issue involves cobbler before 3.3.0 allows log poisoning. Remediation is available by upgrading affected packages to version 3.3.0.

CVE-2021-40323 at a Glance

CVE Identifier CVE-2021-40323
GHSA Identifier GHSA-cpqf-3c3r-c9g2
Severity HIGH
CVSS v3.1 Base Score 9.8
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product Cobbler
Package Ecosystem PyPI
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-2021-40323

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

cobbler fixed: 3.3.0 
pip install cobbler>=3.3.0
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 cobbler

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2021-40323, inspect your installed packages using pip:

pip show cobbler

Analyze the terminal output to locate any version of Cobbler in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.3.0), your application is affected.

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

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 Cobbler, 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

Cobbler before 3.3.0 allows log poisoning, and resultant Remote Code Execution, via an XMLRPC method that logs to the logfile for template injection.

CVE-2021-40323 Affected Cobbler Versions

1 component(s)
Fixed Versions:
3.3.0
Product / Package Ecosystem Affected Versions Fixed Version
cobbler
pypi/cobbler
PyPI
< 3.3.0
3.3.0

References

NVD — CVE-2021-40323 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-40323
Security Fix Commit FIX COMMIT
https://github.com/cobbler/cobbler/commit/d8f60bbf14a838c8c8a1dba98086b223e35fe70a
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-cpqf-3c3r-c9g2
Cobbler Source Repository REPOSITORY
https://github.com/cobbler/cobbler
Cobbler Release RELEASE
https://github.com/cobbler/cobbler/releases/tag/v3.3.0
Cobbler Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/cobbler/PYSEC-2021-373.yaml

Frequently Asked Questions

What is CVE-2021-40323?
CVE-2021-40323 is a security vulnerability in Cobbler involving Cobbler before 3.3.0 allows log poisoning under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which Cobbler versions are affected?
Affected versions include releases prior to 3.3.0 across affected packages: cobbler.
What version fixes CVE-2021-40323?
Upgrading to 3.3.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is cobbler affected?
Yes, cobbler is affected in releases prior to 3.3.0. Upgrade your dependency to 3.3.0 or later.
What is the CVSS score of CVE-2021-40323?
CVE-2021-40323 has a CVSS v3.1 base score of 9.8 (HIGH) 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-2021-40323?
CVE-2021-40323 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 PyPI dependencies for CVE-2021-40323?
Run the dependency tree command: 'pip show cobbler'. 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-cpqf-3c3r-c9g2",
  "modified" : "2024-09-13T15:11:50Z",
  "published" : "2021-10-05T17:53:20Z",
  "aliases" : [ "CVE-2021-40323" ],
  "summary" : "Cobbler before 3.3.0 allows log poisoning",
  "details" : "Cobbler before 3.3.0 allows log poisoning, and resultant Remote Code Execution, via an XMLRPC method that logs to the logfile for template injection.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "cobbler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-40323"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cobbler/cobbler/commit/d8f60bbf14a838c8c8a1dba98086b223e35fe70a"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-cpqf-3c3r-c9g2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cobbler/cobbler"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cobbler/cobbler/releases/tag/v3.3.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/cobbler/PYSEC-2021-373.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-10-05T15:57:32Z",
    "nvd_published_at" : "2021-10-04T06:15:00Z"
  }
}