CVE-2019-15149: Mitogen Undirectional Routing Wasn't Respected Vulnerability

CRITICAL
Advisory Identifier: GHSA-8rf6-w2mx-4xjh
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CVSS 9.8
Published
Advisory Summary

CVE-2019-15149 is a CRITICAL (CVSS 9.8) undirectional routing wasn't respected vulnerability (General Security Weakness) affecting Mitogen libraries in the PyPI ecosystem. The issue involves undirectional routing wasn't respected in some cases in mitogen. Remediation is available by upgrading affected packages to version 0.2.8.

CVE-2019-15149 at a Glance

CVE Identifier CVE-2019-15149
GHSA Identifier GHSA-8rf6-w2mx-4xjh
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification General Security Weakness
Affected Product Mitogen
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:3.0/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-2019-15149

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

mitogen fixed: 0.2.8 
pip install mitogen>=0.2.8
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 mitogen

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2019-15149, inspect your installed packages using pip:

pip show mitogen

Analyze the terminal output to locate any version of Mitogen in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.2.8), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under General Security Weakness. In Mitogen, 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

core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the case of a child that is initiated by another child. The Ansible extension is unaffected. NOTE: the vendor disputes this issue because it is exploitable only in conjunction with hypothetical other factors, i.e., an affected use case within a library caller, and a bug in the message receiver policy code that led to reliance on this extra protection mechanism.

CVE-2019-15149 Affected Mitogen Versions

1 component(s)
Fixed Versions:
0.2.8
Product / Package Ecosystem Affected Versions Fixed Version
mitogen
pypi/mitogen
PyPI
< 0.2.8
0.2.8

References

NVD — CVE-2019-15149 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-15149
Security Fix Commit FIX COMMIT
https://github.com/dw/mitogen/commit/5924af1566763e48c42028399ea0cd95c457b3dc
Mitogen Source Repository REPOSITORY
https://github.com/dw/mitogen
Mitogen Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/mitogen/PYSEC-2019-104.yaml
Mitogen Security Information SECURITY
https://mitogen.networkgenomics.com/changelog.html#v0-2-8-2019-08-18

Frequently Asked Questions

What is CVE-2019-15149?
CVE-2019-15149 is a security vulnerability in Mitogen involving Undirectional routing wasn't respected in some cases in Mitogen under General Security Weakness.
Which Mitogen versions are affected?
Affected versions include releases prior to 0.2.8 across affected packages: mitogen.
What version fixes CVE-2019-15149?
Upgrading to 0.2.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mitogen affected?
Yes, mitogen is affected in releases prior to 0.2.8. Upgrade your dependency to 0.2.8 or later.
What is the CVSS score of CVE-2019-15149?
CVE-2019-15149 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-15149?
CVE-2019-15149 is classified under General Security Weakness.
How can I check PyPI dependencies for CVE-2019-15149?
Run the dependency tree command: 'pip show mitogen'. 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-8rf6-w2mx-4xjh",
  "modified" : "2024-09-25T17:36:44Z",
  "published" : "2019-08-19T23:45:47Z",
  "withdrawn" : "2019-08-20T14:13:17Z",
  "aliases" : [ "CVE-2019-15149" ],
  "summary" : "Undirectional routing wasn't respected in some cases in Mitogen",
  "details" : "core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the case of a child that is initiated by another child. The Ansible extension is unaffected. NOTE: the vendor disputes this issue because it is exploitable only in conjunction with hypothetical other factors, i.e., an affected use case within a library caller, and a bug in the message receiver policy code that led to reliance on this extra protection mechanism.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/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" : "mitogen"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.2.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-15149"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dw/mitogen/commit/5924af1566763e48c42028399ea0cd95c457b3dc"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/dw/mitogen"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/mitogen/PYSEC-2019-104.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://mitogen.networkgenomics.com/changelog.html#v0-2-8-2019-08-18"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-08-19T23:45:21Z",
    "nvd_published_at" : "2019-08-18T20:15:00Z"
  }
}