CVE-2021-3028: Git big picture Git-big-picture Code Execution Vulnerability

CRITICAL
Advisory Identifier: GHSA-x38j-4rr5-hqrj
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CVSS 9.8
CWE-20
Published
Advisory Summary

CVE-2021-3028 is a CRITICAL (CVSS 9.8) git-big-picture code execution vulnerability (CWE-20: Improper Input Validation) affecting Git big picture libraries in the PyPI ecosystem. The issue involves git-big-picture code execution. Remediation is available by upgrading affected packages to version 1.0.0.

CVE-2021-3028 at a Glance

CVE Identifier CVE-2021-3028
GHSA Identifier GHSA-x38j-4rr5-hqrj
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-20: Improper Input Validation
Affected Product Git big picture
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-2021-3028

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

git-big-picture fixed: 1.0.0 
pip install git-big-picture>=1.0.0
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 git-big-picture

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2021-3028, inspect your installed packages using pip:

pip show git-big-picture

Analyze the terminal output to locate any version of Git big picture in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.0), your application is affected.

Note: The pip show git-big-picture command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Git big picture, 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

git-big-picture before 1.0.0 mishandles `'` characters in a branch name, leading to code execution.

CVE-2021-3028 Affected Git big picture Versions

1 component(s)
Fixed Versions:
1.0.0
Product / Package Ecosystem Affected Versions Fixed Version
git-big-picture
pypi/git-big-picture
PyPI
< 1.0.0
1.0.0

References

NVD — CVE-2021-3028 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3028
Git big picture Source Repository REPOSITORY
https://github.com/git-big-picture/git-big-picture/pull/27
Git big picture Source Repository REPOSITORY
https://github.com/git-big-picture/git-big-picture/pull/62
Git big picture Source Repository REPOSITORY
https://github.com/git-big-picture/git-big-picture
Git big picture Release RELEASE
https://github.com/git-big-picture/git-big-picture/releases/tag/v1.0.0
Git big picture Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/git-big-picture/PYSEC-2021-15.yaml

Frequently Asked Questions

What is CVE-2021-3028?
CVE-2021-3028 is a security vulnerability in Git big picture involving git-big-picture Code Execution under CWE-20: Improper Input Validation.
Which Git big picture versions are affected?
Affected versions include releases prior to 1.0.0 across affected packages: git-big-picture.
What version fixes CVE-2021-3028?
Upgrading to 1.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is git-big-picture affected?
Yes, git-big-picture is affected in releases prior to 1.0.0. Upgrade your dependency to 1.0.0 or later.
What is the CVSS score of CVE-2021-3028?
CVE-2021-3028 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-2021-3028?
CVE-2021-3028 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check PyPI dependencies for CVE-2021-3028?
Run the dependency tree command: 'pip show git-big-picture'. 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-x38j-4rr5-hqrj",
  "modified" : "2024-09-20T18:00:58Z",
  "published" : "2022-05-24T17:39:13Z",
  "aliases" : [ "CVE-2021-3028" ],
  "summary" : "git-big-picture Code Execution",
  "details" : "git-big-picture before 1.0.0 mishandles `'` characters in a branch name, leading to code execution.",
  "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" : "git-big-picture"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3028"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/git-big-picture/git-big-picture/pull/27"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/git-big-picture/git-big-picture/pull/62"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/git-big-picture/git-big-picture"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/git-big-picture/git-big-picture/releases/tag/v1.0.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/git-big-picture/PYSEC-2021-15.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-22T22:33:47Z",
    "nvd_published_at" : "2021-01-13T17:15:00Z"
  }
}