CVE-2021-32090: Localstack Command Injection Vulnerability

CRITICAL
Advisory Identifier: GHSA-hpr6-f4vq-mxch
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CVSS 9.8
CWE-77
Published
Advisory Summary

CVE-2021-32090 is a CRITICAL (CVSS 9.8) command injection vulnerability (CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')) affecting Localstack libraries in the PyPI ecosystem. The issue involves command injection in localstack. Remediation is available by upgrading affected packages to version 0.12.10.

CVE-2021-32090 at a Glance

CVE Identifier CVE-2021-32090
GHSA Identifier GHSA-hpr6-f4vq-mxch
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Affected Product Localstack
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-2021-32090

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

localstack fixed: 0.12.10 
pip install localstack>=0.12.10
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 localstack

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2021-32090, inspect your installed packages using pip:

pip show localstack

Analyze the terminal output to locate any version of Localstack in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.12.10), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection'), where the product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. In Localstack, 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 dashboard component of StackLift LocalStack allows attackers to inject arbitrary shell commands via the functionName parameter.

CVE-2021-32090 Affected Localstack Versions

1 component(s)
Fixed Versions:
0.12.10
Product / Package Ecosystem Affected Versions Fixed Version
localstack
pypi/localstack
PyPI
< 0.12.10
0.12.10

References

NVD — CVE-2021-32090 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32090
Security Fix Commit FIX COMMIT
https://github.com/localstack/localstack/commit/01cd169ae5d077693d4c1a4679a95e30b8d44d54
blog.sonarsource.com/hack-the-stack-with... WEB
https://blog.sonarsource.com/hack-the-stack-with-localstack
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-hpr6-f4vq-mxch
Localstack Source Repository REPOSITORY
https://github.com/localstack/localstack
Localstack Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/localstack/PYSEC-2021-101.yaml
portswigger.net/daily-swig/localsta... WEB
https://portswigger.net/daily-swig/localstack-zero-day-vulnerabilities-chained-to-achieve-remote-takeover-of-local-instances

Frequently Asked Questions

What is CVE-2021-32090?
CVE-2021-32090 is a security vulnerability in Localstack involving Command injection in LocalStack under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection').
Which Localstack versions are affected?
Affected versions include releases prior to 0.12.10 across affected packages: localstack.
What version fixes CVE-2021-32090?
Upgrading to 0.12.10 (or the latest patched release for your respective branch) resolves the vulnerability.
Is localstack affected?
Yes, localstack is affected in releases prior to 0.12.10. Upgrade your dependency to 0.12.10 or later.
What is the CVSS score of CVE-2021-32090?
CVE-2021-32090 has a CVSS v3.1 base score of 9.8 (CRITICAL) 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-2021-32090?
CVE-2021-32090 is classified under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') (The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.).
How can I check PyPI dependencies for CVE-2021-32090?
Run the dependency tree command: 'pip show localstack'. 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-hpr6-f4vq-mxch",
  "modified" : "2024-09-30T16:21:18Z",
  "published" : "2021-06-18T18:38:00Z",
  "aliases" : [ "CVE-2021-32090" ],
  "summary" : "Command injection in LocalStack",
  "details" : "The dashboard component of StackLift LocalStack allows attackers to inject arbitrary shell commands via the functionName parameter.",
  "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "localstack"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.12.10"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-32090"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/localstack/localstack/commit/01cd169ae5d077693d4c1a4679a95e30b8d44d54"
  }, {
    "type" : "WEB",
    "url" : "https://blog.sonarsource.com/hack-the-stack-with-localstack"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-hpr6-f4vq-mxch"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/localstack/localstack"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/localstack/PYSEC-2021-101.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://portswigger.net/daily-swig/localstack-zero-day-vulnerabilities-chained-to-achieve-remote-takeover-of-local-instances"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-77" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-19T19:58:03Z",
    "nvd_published_at" : "2021-05-07T05:15:00Z"
  }
}