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The Common Vulnerability Scoring System (CVSS) is widely used but often criticized for its limitations. Many organizations rely solely on CVSS base scores, neglecting temporal and environmental context. This is where cvss-bt, an open-source tool by Stephen Shaffer, comes into play. It enriches CVSS scores by incorporating exploit code maturity and exploitability data from sources like CISA KEV, VulnCheck KEV, EPSS, Metasploit, Nuclei, ExploitDB, and PoC-in-GitHub.
Practice-Verified Commands and Codes
1. Install cvss-bt:
git clone https://github.com/stephenshaffer/cvss-bt.git cd cvss-bt pip install -r requirements.txt
2. Run cvss-bt with a CVE:
python cvss-bt.py --cve CVE-2023-1234
3. Check EPSS Score:
curl -X GET "https://api.first.org/data/v1/epss?cve=CVE-2023-1234"
4. Search ExploitDB for Exploits:
searchsploit CVE-2023-1234
5. Check CISA KEV Catalog:
curl -X GET "https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json"
6. Scan with Nuclei:
nuclei -t cves/ -id CVE-2023-1234
7. Metasploit Module Search:
msfconsole -x "search CVE-2023-1234"
8. GitHub PoC Search:
gh api -X GET search/code -f q='CVE-2023-1234'
What Undercode Say
The cvss-bt tool represents a significant step forward in vulnerability management by addressing the shortcomings of CVSS. By integrating multiple data sources, it provides a more comprehensive view of a vulnerability’s exploitability and potential impact. This approach is crucial for organizations aiming to prioritize vulnerabilities effectively.
In the context of Linux and IT environments, tools like cvss-bt can be integrated into automated workflows using scripts and APIs. For instance, combining cvss-bt with EPSS scores and CISA KEV data allows for real-time vulnerability assessment. This can be further enhanced by leveraging Linux commands like curl, grep, and `jq` to parse and analyze JSON data from APIs.
For Windows environments, PowerShell scripts can be used to automate the retrieval and analysis of CVSS and EPSS data. For example:
Invoke-WebRequest -Uri "https://api.first.org/data/v1/epss?cve=CVE-2023-1234" -OutFile epss.json Get-Content epss.json | ConvertFrom-Json | Select-Object -ExpandProperty data
Additionally, integrating cvss-bt with SIEM solutions like Splunk or ELK can provide continuous monitoring and alerting for high-risk vulnerabilities. This can be achieved by sending enriched CVSS data to these platforms via their APIs.
In conclusion, cvss-bt is a valuable tool for modern cybersecurity practices. By moving beyond the limitations of CVSS base scores and incorporating real-time threat intelligence, organizations can better prioritize and mitigate vulnerabilities. This approach not only enhances security posture but also aligns with the evolving landscape of cyber threats.
Further Reading:
References:
initially reported by: https://www.linkedin.com/posts/resilientcyber_ciso-cyber-appsec-activity-7299919598294880258-ZxRL – Hackers Feeds
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