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Fix KEV workflow to use tags field only (remove vKEV)

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- Removed all vKEV functionality as requested
- Fixed KEV script to only add 'kev' to tags field (not metadata)
- Simplified workflow to focus on CISA KEV catalog only
- Script now correctly adds/removes kev tags in tags field
- Removed VulnCheck API integration placeholder

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Prince Chaddha
2025-08-27 12:40:47 +05:30
parent 32aa6850ce
commit 896b3b79dc
1 changed files with 84 additions and 164 deletions
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248
.github/scripts/update-kev.py vendored
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@@ -5,8 +5,7 @@ KEV Tagging Updater for Nuclei Templates
This script updates KEV (Known Exploited Vulnerabilities) tags for all CVE templates by: This script updates KEV (Known Exploited Vulnerabilities) tags for all CVE templates by:
1. Fetching the latest CISA KEV catalog 1. Fetching the latest CISA KEV catalog
2. Checking each CVE template against the KEV list 2. Checking each CVE template against the KEV list
3. Adding 'kev' tag and metadata for KEV CVEs 3. Adding 'kev' tag to the tags field for KEV CVEs
4. Adding 'vkev' metadata for VulnCheck KEV CVEs (requires API access)
""" """
import os import os
@@ -14,29 +13,23 @@ import re
import sys import sys
import time import time
import json import json
import yaml
import requests import requests
from pathlib import Path from pathlib import Path
from typing import Dict, List, Set, Optional from typing import Set, Optional
# Configuration # Configuration
CISA_KEV_JSON_URL = "https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json" CISA_KEV_JSON_URL = "https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json"
TIMEOUT = 30 TIMEOUT = 30
MAX_RETRIES = 3 MAX_RETRIES = 3
# VulnCheck KEV configuration (placeholder - requires API key)
VULNCHECK_KEV_API = "https://api.vulncheck.com/v3/kev" # Placeholder
VULNCHECK_API_KEY = os.environ.get('VULNCHECK_API_KEY') # Optional API key
class KEVUpdater: class KEVUpdater:
def __init__(self, root_dir: str): def __init__(self, root_dir: str):
self.root_dir = Path(root_dir) self.root_dir = Path(root_dir)
self.updated_count = 0 self.updated_count = 0
self.error_count = 0 self.error_count = 0
self.cisa_kev_cves = set() self.cisa_kev_cves = set()
self.vulncheck_kev_cves = set()
def find_cve_templates(self) -> List[Path]: def find_cve_templates(self) -> list[Path]:
"""Find all CVE template files.""" """Find all CVE template files."""
cve_files = [] cve_files = []
@@ -106,44 +99,66 @@ class KEVUpdater:
return kev_cves return kev_cves
def fetch_vulncheck_kev_data(self) -> Set[str]:
"""Fetch VulnCheck KEV data (requires API key)."""
if not VULNCHECK_API_KEY:
print("VulnCheck API key not provided, skipping vKEV updates")
return set()
# Placeholder implementation - would need actual VulnCheck API integration
print("VulnCheck KEV integration not implemented yet")
print("To enable vKEV updates, implement VulnCheck API integration")
# TODO: Implement VulnCheck API integration
# This would require:
# 1. Authentication with VulnCheck API
# 2. Fetching their KEV dataset
# 3. Extracting CVE IDs from their format
return set()
def has_kev_tag(self, content: str) -> bool: def has_kev_tag(self, content: str) -> bool:
"""Check if template already has KEV tag.""" """Check if template already has KEV tag in tags field."""
# Check in tags field # Look for tags field and check if kev is present
tags_match = re.search(r'tags:\s*([^\n]+)', content) tags_match = re.search(r'tags:\s*([^\n]+)', content)
if tags_match: if tags_match:
tags_str = tags_match.group(1) tags_str = tags_match.group(1)
# Check for kev as a standalone tag (not part of another word)
if re.search(r'\bkev\b', tags_str, re.IGNORECASE): if re.search(r'\bkev\b', tags_str, re.IGNORECASE):
return True return True
return False return False
def has_kev_metadata(self, content: str) -> bool: def add_kev_tag(self, content: str) -> tuple[str, bool]:
"""Check if template already has KEV metadata.""" """Add kev tag to the tags field. Returns (updated_content, was_updated)."""
return bool(re.search(r'kev:\s*true', content, re.IGNORECASE)) if self.has_kev_tag(content):
return content, False
# Find the tags field
tags_match = re.search(r'(\s*tags:\s*)([^\n]+)', content)
if tags_match:
indent = tags_match.group(1)
existing_tags = tags_match.group(2).rstrip()
# Add kev tag at the end
new_tags = existing_tags + ',kev'
new_line = f"{indent}{new_tags}"
updated_content = content.replace(tags_match.group(0), new_line)
return updated_content, True
else:
print("Warning: No tags field found to add kev tag")
return content, False
def has_vkev_metadata(self, content: str) -> bool: def remove_kev_tag(self, content: str) -> tuple[str, bool]:
"""Check if template already has vKEV metadata.""" """Remove kev tag from the tags field. Returns (updated_content, was_updated)."""
return bool(re.search(r'vkev:\s*true', content, re.IGNORECASE)) if not self.has_kev_tag(content):
return content, False
# Find and update tags field
tags_match = re.search(r'(\s*tags:\s*)([^\n]+)', content)
if tags_match:
indent = tags_match.group(1)
existing_tags = tags_match.group(2)
# Remove kev tag in various positions
new_tags = existing_tags
# Remove ,kev or kev, patterns
new_tags = re.sub(r',\s*kev\b', '', new_tags)
new_tags = re.sub(r'\bkev\s*,', '', new_tags)
new_tags = re.sub(r'^\s*kev\s*$', '', new_tags) # kev is only tag
new_tags = re.sub(r'^\s*kev\s*,\s*', '', new_tags) # kev is first tag
if new_tags != existing_tags:
new_line = f"{indent}{new_tags}"
updated_content = content.replace(tags_match.group(0), new_line)
return updated_content, True
return content, False
def update_template_with_kev(self, file_path: Path, cve_id: str, is_cisa_kev: bool, is_vulncheck_kev: bool) -> bool: def update_template_with_kev(self, file_path: Path, cve_id: str, is_kev: bool) -> bool:
"""Update a template file with KEV tags and metadata.""" """Update a template file with KEV tags."""
try: try:
with open(file_path, 'r', encoding='utf-8') as f: with open(file_path, 'r', encoding='utf-8') as f:
content = f.read() content = f.read()
@@ -151,81 +166,23 @@ class KEVUpdater:
original_content = content original_content = content
updated = False updated = False
# Check current state if is_kev:
has_kev_tag = self.has_kev_tag(content)
has_kev_meta = self.has_kev_metadata(content)
has_vkev_meta = self.has_vkev_metadata(content)
# Update CISA KEV
if is_cisa_kev:
# Add kev tag if missing # Add kev tag if missing
if not has_kev_tag: content, tag_added = self.add_kev_tag(content)
tags_match = re.search(r'(\s+tags:\s*)([^\n]+)', content) if tag_added:
if tags_match: print(f"Added kev tag to {file_path.name}")
indent = tags_match.group(1)
existing_tags = tags_match.group(2)
# Add kev tag
new_tags = existing_tags.rstrip() + ',kev'
content = content.replace(tags_match.group(0), f"{indent}{new_tags}")
updated = True
print(f"Added kev tag to {file_path.name}")
# Add kev metadata if missing
if not has_kev_meta:
# Find metadata section
metadata_match = re.search(r'(\s+metadata:\s*\n)', content)
if metadata_match:
# Add kev: true after metadata section start
insertion_point = metadata_match.end()
indent = " " # Standard YAML indent
kev_meta = f"{indent}kev: true\n"
content = content[:insertion_point] + kev_meta + content[insertion_point:]
updated = True
print(f"Added kev metadata to {file_path.name}")
else:
# Create metadata section if it doesn't exist
# Find a good place to insert it (after classification or before tags)
classification_match = re.search(r'(\s+classification:.*?\n)(\s+(?:metadata|tags))', content, re.DOTALL)
if classification_match:
insertion_point = classification_match.start(2)
metadata_section = f" metadata:\n kev: true\n"
content = content[:insertion_point] + metadata_section + content[insertion_point:]
updated = True
print(f"Created metadata section with kev for {file_path.name}")
# Update VulnCheck KEV
if is_vulncheck_kev and not has_vkev_meta:
# Add vkev metadata
metadata_match = re.search(r'(\s+metadata:\s*\n)', content)
if metadata_match:
# Find a good spot within metadata section
insertion_point = metadata_match.end()
# Look for existing metadata to maintain order
next_field_match = re.search(r'\n(\s+\w+:)', content[insertion_point:])
if next_field_match:
# Insert before next field
actual_insertion = insertion_point + next_field_match.start()
indent = " "
vkev_meta = f"{indent}vkev: true\n"
content = content[:actual_insertion] + vkev_meta + content[actual_insertion:]
else:
# Insert at end of metadata section
indent = " "
vkev_meta = f"{indent}vkev: true\n"
content = content[:insertion_point] + vkev_meta + content[insertion_point:]
updated = True updated = True
print(f"Added vkev metadata to {file_path.name}") else:
elif is_cisa_kev: # Only create metadata if we also added kev # Remove kev tag if present but CVE is not in KEV catalog
# Metadata section was already created above if self.has_kev_tag(content):
# Add vkev to existing metadata # Only remove if we're confident about our KEV data
kev_meta_match = re.search(r'(\s+kev: true\n)', content) if len(self.cisa_kev_cves) > 1000: # Sanity check
if kev_meta_match: content, tag_removed = self.remove_kev_tag(content)
insertion_point = kev_meta_match.end() if tag_removed:
indent = " " print(f"Removed kev tag from {file_path.name} (no longer in KEV catalog)")
vkev_meta = f"{indent}vkev: true\n" updated = True
content = content[:insertion_point] + vkev_meta + content[insertion_point:] else:
updated = True print(f"Warning: {cve_id} has kev tag but not in current KEV catalog (keeping tag)")
print(f"Added vkev metadata after kev for {file_path.name}")
# Write updated content if changes were made # Write updated content if changes were made
if updated: if updated:
@@ -240,50 +197,12 @@ class KEVUpdater:
self.error_count += 1 self.error_count += 1
return False return False
def remove_kev_tags(self, file_path: Path, cve_id: str) -> bool:
"""Remove KEV tags from templates that are no longer in KEV lists."""
try:
with open(file_path, 'r', encoding='utf-8') as f:
content = f.read()
original_content = content
updated = False
# Remove kev tag if present
if self.has_kev_tag(content):
# Remove from tags
content = re.sub(r',\s*kev\b', '', content) # Remove ,kev
content = re.sub(r'\bkev\s*,', '', content) # Remove kev,
content = re.sub(r'\s+kev\b(?![\w-])', '', content) # Remove standalone kev
updated = True
print(f"Removed kev tag from {file_path.name}")
# Remove kev metadata if present
if self.has_kev_metadata(content):
content = re.sub(r'\s+kev:\s*true\s*\n', '\n', content)
updated = True
print(f"Removed kev metadata from {file_path.name}")
# Note: We don't remove vkev metadata automatically as VulnCheck data might be incomplete
if updated:
with open(file_path, 'w', encoding='utf-8') as f:
f.write(content)
return True
return False
except Exception as e:
print(f"Error cleaning KEV tags from {file_path}: {e}")
return False
def run(self): def run(self):
"""Main execution function.""" """Main execution function."""
print("Starting KEV tagging update...") print("Starting KEV tagging update...")
# Fetch KEV data # Fetch KEV data
self.cisa_kev_cves = self.fetch_cisa_kev_data() self.cisa_kev_cves = self.fetch_cisa_kev_data()
self.vulncheck_kev_cves = self.fetch_vulncheck_kev_data()
if not self.cisa_kev_cves: if not self.cisa_kev_cves:
print("No CISA KEV data available, exiting") print("No CISA KEV data available, exiting")
@@ -298,30 +217,31 @@ class KEVUpdater:
return return
# Process templates # Process templates
kev_found = 0
non_kev_with_tag = 0
for file_path in template_files: for file_path in template_files:
cve_id = self.extract_cve_id(file_path) cve_id = self.extract_cve_id(file_path)
if cve_id: if cve_id:
is_cisa_kev = cve_id in self.cisa_kev_cves is_kev = cve_id in self.cisa_kev_cves
is_vulncheck_kev = cve_id in self.vulncheck_kev_cves
if is_cisa_kev or is_vulncheck_kev: if is_kev:
# Add KEV tags/metadata kev_found += 1
if self.update_template_with_kev(file_path, cve_id, is_cisa_kev, is_vulncheck_kev):
self.updated_count += 1 if self.update_template_with_kev(file_path, cve_id, is_kev):
elif self.has_kev_tag(open(file_path, 'r').read()) or self.has_kev_metadata(open(file_path, 'r').read()): self.updated_count += 1
# Template has KEV tags but CVE is not in current KEV list
# Only remove if we're confident about our data # Track non-KEV CVEs that have kev tags for reporting
if len(self.cisa_kev_cves) > 1000: # Sanity check if not is_kev and self.has_kev_tag(open(file_path, 'r').read()):
print(f"Warning: {cve_id} has KEV tags but not in current KEV catalog") non_kev_with_tag += 1
# Uncomment the line below to automatically remove outdated KEV tags
# self.remove_kev_tags(file_path, cve_id)
else: else:
print(f"Could not extract CVE ID from {file_path}") print(f"Could not extract CVE ID from {file_path}")
print(f"\nKEV update complete!") print(f"\nKEV update complete!")
print(f"Templates updated: {self.updated_count}") print(f"Templates updated: {self.updated_count}")
print(f"CISA KEV CVEs processed: {len(self.cisa_kev_cves)}") print(f"KEV CVEs found in templates: {kev_found}")
print(f"VulnCheck KEV CVEs processed: {len(self.vulncheck_kev_cves)}") print(f"CISA KEV catalog size: {len(self.cisa_kev_cves)}")
print(f"Non-KEV templates with kev tags: {non_kev_with_tag}")
print(f"Errors: {self.error_count}") print(f"Errors: {self.error_count}")
def main(): def main():