Arango CVE Processor

Before you get started

Arango CVE Processor is built into Vulmatch which also handles the download of CVE objects (what you need for ACVEP to work). As such, Vulmatch is probably better suited to what you're looking for.

tl;dr

A small script that enriches CVEs to other sources with all data stored as STIX 2.1 objects.

Watch the demo.

Overview

Here at DOGESEC we work with a lot of CVE data across our products. cve2stix generates core STIX 2.1 Vulnerability objects from CVE data.

However, we have lots of other sources (EPSS, KEV, ATT&CK...) that we want to enrich this data with.

We built Arango CVE Processor to handle the generation and maintenance of these enrichments.

In short, Arango CVE Processor is a script that;

1. reads the ingested CVE STIX data in ArangoDB
2. creates STIX objects to represent the relationships between CVE and other datasets

Usage

Install the script

# clone the latest code
git clone https://github.com/muchdogesec/arango_cve_processor
# create a venv
cd arango_cve_processor
python3 -m venv arango_cve_processor-venv
source arango_cve_processor-venv/bin/activate
# install requirements
pip3 install -r requirements.txt

Configuration options

Arango CVE Processor has various settings that are defined in an .env file.

To create a template for the file:

cp .env.example .env

To see more information about how to set the variables, and what they do, read the .env.markdown file.

Run

python3 arango_cve_processor.py \
    --database DATABASE \
    --relationship RELATIONSHIP \
    --ignore_embedded_relationships BOOLEAN \
    --modified_min DATE \
    --cve_id CVE-NNNN-NNNN CVE-NNNN-NNNN

Where;

• --database (required): the arangoDB database name where the objects you want to link are found. It must contain the collections nvd_cve_vertex_collection and nvd_cve_edge_collection
• --relationship (optional, dictionary): you can apply updates to certain relationships at run time. Default is all. Note, you should ensure your database contains all the required seeded data. User can select from;
  • cve-cwe
  • cve-capec
  • cve-attack
  • cve-epss
  • cve-kev
• --ignore_embedded_relationships (optional, boolean). Default is false. if true passed, this will stop any embedded relationships from being generated. This is a stix2arango feature where STIX SROs will also be created for _ref and _refs properties inside each object (e.g. if _ref property = identity--1234 and SRO between the object with the _ref property and identity--1234 will be created). See stix2arango docs for more detail if required, essentially this a wrapper for the same --ignore_embedded_relationships setting implemented by stix2arango
• --ignore_embedded_relationships_sro (optional): boolean, if true passed, will stop any embedded relationships from being generated from SRO objects (type = relationship). Default is false
• --ignore_embedded_relationships_smo (optional): boolean, if true passed, will stop any embedded relationships from being generated from SMO objects (type = marking-definition, extension-definition, language-content). Default is false
• --modified_min (optional, date in format YYYY-MM-DD). By default arango_cve_processor will consider all CVEs in the database specified with the property _is_latest==true (that is; the latest version of the object). Using this flag with a modified time value will further filter the results processed by arango_cve_processor to STIX objects with a modified time >= to the value specified. This is useful when you don't want to process data for very old CVEs in the database.
• --created_min (optional, date in format YYYY-MM-DD). Same as modified_min but considers created date.
• --cve_id (optional, CVE ID): will only process the relationships for the CVE passed, otherwise all CVEs will be considered.

Examples

Process CVE -> CWE relationships for all CVEs modified after 2023-01-01 and only created embedded relationships from SDOs and SCOs...

python3 arango_cve_processor.py \
  --database arango_cve_processor_standard_tests_database \
  --relationship cve-cwe \
  --modified_min 2024-02-01 \
  --ignore_embedded_relationships true \
  --ignore_embedded_relationships_sro true \
  --ignore_embedded_relationships_smo true

Get all EPSS scores for CVEs

python3 arango_cve_processor.py \
  --database arango_cve_processor_standard_tests_database \
  --relationship cve-epss \
  --ignore_embedded_relationships false \
  --ignore_embedded_relationships_sro true \
  --ignore_embedded_relationships_smo true

Backfilling data

stix2arango contains a set of utility scripts that can be used to backfill all the datasources required for this test.

How it works

If you would like to know how the logic of this script works in detail, please consult the /docs directory.

Useful supporting tools

• To generate STIX 2.1 extensions: stix2 Python Lib
• STIX 2.1 specifications for objects: STIX 2.1 docs
• ArangoDB docs

Support

Minimal support provided via the DOGESEC community.

License

Apache 2.0.