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2ef05ec | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | #!/usr/bin/env python3
"""CVSS 3.1 vector helper for SecureCodePairs.
Records may optionally carry an explicit ``cvss_vector``. When absent, a
defensible default is derived from the severity bucket and a few flags
(network-exploitable, requires privileges, user interaction, scope change).
This keeps the dataset consistent and machine-readable without hand-authoring
200+ vectors.
"""
from typing import Dict, Optional
SEVERITY_DEFAULTS: Dict[str, str] = {
# CVSS:3.1 base strings (base score in comment)
"Critical": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", # 9.8
"High": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", # 8.8
"Medium": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N", # 6.1
"Low": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N", # 2.6
}
# Flags that escalate a vector toward the higher-severity default.
CRITICAL_IF = {"rce", "deserialization", "command-injection", "ssrf", "sqli", "auth-bypass"}
def compute_cvss(record: dict) -> str:
explicit = record.get("cvss_vector")
if explicit and explicit.startswith("CVSS:"):
return explicit
sev = record.get("severity", "Medium")
if sev not in SEVERITY_DEFAULTS:
sev = "Medium"
# Escalate High->Critical when clearly RCE-class and network-exploitable.
tags = set(record.get("tags", []))
if sev == "High" and (tags & CRITICAL_IF):
return SEVERITY_DEFAULTS["Critical"]
return SEVERITY_DEFAULTS[sev]
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