CVE-2019-7537: Donfig Donfig Command Injection Vulnerability

CRITICAL
Advisory Identifier: GHSA-3qr5-h7w4-3gx3
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CVSS 9.8
CWE-77
Published
Advisory Summary

CVE-2019-7537 is a CRITICAL (CVSS 9.8) donfig command injection vulnerability (CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')) affecting Donfig libraries in the PyPI ecosystem. The issue involves donfig command injection in collect_yaml method. Remediation is available by upgrading affected packages to version 0.4.0.

CVE-2019-7537 at a Glance

CVE Identifier CVE-2019-7537
GHSA Identifier GHSA-3qr5-h7w4-3gx3
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 Donfig
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-2019-7537

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

donfig fixed: 0.4.0 
pip install donfig>=0.4.0
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 donfig

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2019-7537, inspect your installed packages using pip:

pip show donfig

Analyze the terminal output to locate any version of Donfig in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.0), your application is affected.

Note: The pip show donfig 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 Donfig, 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

An issue was discovered in Donfig 0.3.0. There is a vulnerability in the `collect_yaml` method in `config_obj.py`. It can execute arbitrary Python commands, resulting in command execution.

CVE-2019-7537 Affected Donfig Versions

1 component(s)
Fixed Versions:
0.4.0
Product / Package Ecosystem Affected Versions Fixed Version
donfig
pypi/donfig
PyPI
< 0.4.0
0.4.0

References

NVD — CVE-2019-7537 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-7537
Donfig Source Repository REPOSITORY
https://github.com/pytroll/donfig/issues/5
Security Fix Commit FIX COMMIT
https://github.com/pytroll/donfig/commit/1f9dbf83b17419a06d63c14ef3fbd29dbc1b8ce5
Donfig Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/donfig/PYSEC-2019-21.yaml
Donfig Source Repository REPOSITORY
https://github.com/pytroll/donfig
Donfig Source Repository REPOSITORY
https://github.com/pytroll/donfig/commits/master

Frequently Asked Questions

What is CVE-2019-7537?
CVE-2019-7537 is a security vulnerability in Donfig involving Donfig Command Injection in collect_yaml method under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection').
Which Donfig versions are affected?
Affected versions include releases prior to 0.4.0 across affected packages: donfig.
What version fixes CVE-2019-7537?
Upgrading to 0.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is donfig affected?
Yes, donfig is affected in releases prior to 0.4.0. Upgrade your dependency to 0.4.0 or later.
What is the CVSS score of CVE-2019-7537?
CVE-2019-7537 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-2019-7537?
CVE-2019-7537 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-2019-7537?
Run the dependency tree command: 'pip show donfig'. 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-3qr5-h7w4-3gx3",
  "modified" : "2024-09-20T16:27:57Z",
  "published" : "2022-05-14T01:15:39Z",
  "aliases" : [ "CVE-2019-7537" ],
  "summary" : "Donfig Command Injection in collect_yaml method",
  "details" : "An issue was discovered in Donfig 0.3.0. There is a vulnerability in the `collect_yaml` method in `config_obj.py`. It can execute arbitrary Python commands, resulting in command execution.",
  "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" : "donfig"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.3.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-7537"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pytroll/donfig/issues/5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pytroll/donfig/commit/1f9dbf83b17419a06d63c14ef3fbd29dbc1b8ce5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/donfig/PYSEC-2019-21.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pytroll/donfig"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pytroll/donfig/commits/master"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-77" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-19T19:52:48Z",
    "nvd_published_at" : "2019-03-21T20:29:00Z"
  }
}