CVE-2023-36543: Apache airflow Apache Airflow Improper Input Validation Vulnerability

HIGH
Advisory Identifier: GHSA-3h4m-m55v-gx4m
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CVSS 6.5
CWE-1333 CWE-20
Published
Advisory Summary

CVE-2023-36543 is a HIGH (CVSS 6.5) apache airflow improper input validation vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting Apache airflow libraries in the PyPI ecosystem. The issue involves apache airflow improper input validation vulnerability. Remediation is available by upgrading affected packages to version 2.6.3.

CVE-2023-36543 at a Glance

CVE Identifier CVE-2023-36543
GHSA Identifier GHSA-3h4m-m55v-gx4m
Severity HIGH
CVSS v3.1 Base Score 6.5
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product Apache airflow
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

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

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

How to Fix CVE-2023-36543

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

apache-airflow fixed: 2.6.3 
pip install apache-airflow>=2.6.3
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 apache-airflow

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2023-36543, inspect your installed packages using pip:

pip show apache-airflow

Analyze the terminal output to locate any version of Apache airflow in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.6.3), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1333: Inefficient Regular Expression Complexity, where the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. In Apache airflow, 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

Apache Airflow, versions before 2.6.3, has a vulnerability where an authenticated user can use crafted input to make the current request hang. It is recommended to upgrade to a version that is not affected

CVE-2023-36543 Affected Apache airflow Versions

1 component(s)
Fixed Versions:
2.6.3
Product / Package Ecosystem Affected Versions Fixed Version
apache-airflow
pypi/apache-airflow
PyPI
< 2.6.3
2.6.3

References

NVD — CVE-2023-36543 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-36543
Apache airflow Source Repository REPOSITORY
https://github.com/apache/airflow/pull/32060
Security Fix Commit FIX COMMIT
https://github.com/apache/airflow/commit/116e607ddcb32480e57c342f48226545ac6fc315
Apache airflow Source Repository REPOSITORY
https://github.com/apache/airflow
Apache airflow Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2023-106.yaml
lists.apache.org/thread/tokfs980504y... WEB
https://lists.apache.org/thread/tokfs980504ylgk3cv3hjlnrtbv4tng4

Frequently Asked Questions

What is CVE-2023-36543?
CVE-2023-36543 is a security vulnerability in Apache airflow involving Apache Airflow Improper Input Validation vulnerability under CWE-1333: Inefficient Regular Expression Complexity.
Which Apache airflow versions are affected?
Affected versions include releases prior to 2.6.3 across affected packages: apache-airflow.
What version fixes CVE-2023-36543?
Upgrading to 2.6.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is apache-airflow affected?
Yes, apache-airflow is affected in releases prior to 2.6.3. Upgrade your dependency to 2.6.3 or later.
What is the CVSS score of CVE-2023-36543?
CVE-2023-36543 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2023-36543?
CVE-2023-36543 is classified under CWE-1333: Inefficient Regular Expression Complexity (The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.).
How can I check PyPI dependencies for CVE-2023-36543?
Run the dependency tree command: 'pip show apache-airflow'. 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-3h4m-m55v-gx4m",
  "modified" : "2024-11-18T16:26:31Z",
  "published" : "2023-07-12T12:31:36Z",
  "aliases" : [ "CVE-2023-36543" ],
  "summary" : "Apache Airflow Improper Input Validation vulnerability",
  "details" : "Apache Airflow, versions before 2.6.3, has a vulnerability where an authenticated user can use crafted input to make the current request hang. It is recommended to upgrade to a version that is not affected",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "apache-airflow"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.6.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-36543"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/airflow/pull/32060"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/airflow/commit/116e607ddcb32480e57c342f48226545ac6fc315"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/airflow"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2023-106.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/tokfs980504ylgk3cv3hjlnrtbv4tng4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333", "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-12T17:30:47Z",
    "nvd_published_at" : "2023-07-12T10:15:10Z"
  }
}