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package CSAF::Util::CVSS;
use 5.010001;
use strict;
use warnings;
use utf8;
use Exporter 'import';
our @EXPORT_OK = (qw[decode_cvss_vector_string]);
my $CVSS2_METRIC_LABEL = {
AV => 'accessVector',
AC => 'accessComplexity',
Au => 'authentication',
C => 'confidentialityImpact',
I => 'integrityImpact',
A => 'availabilityImpact',
E => 'exploitability',
RL => 'remediationLevel',
RC => 'reportConfidence',
CDP => 'collateralDamagePotential',
TD => 'targetDistribution',
CR => 'confidentialityRequirement',
IR => 'integrityRequirement',
AR => 'availabilityRequirement'
};
my $CVSS3_METRIC_LABEL = {
A => 'availabilityImpact',
AC => 'attackComplexity',
AV => 'attackVector',
C => 'confidentialityImpact',
E => 'exploitCodeMaturity',
I => 'integrityImpact',
PR => 'privilegesRequired',
RC => 'reportConfidence',
RL => 'remediationLevel',
S => 'scope',
UI => 'userInteraction',
MA => 'modifiedAvailabilityImpact',
MAC => 'modifiedAttackComplexity',
MAV => 'modifiedAttackVector',
MC => 'modifiedConfidentialityImpact',
MI => 'modifiedIntegrityImpact',
MPR => 'modifiedPrivilegesRequired',
MS => 'modifiedScope',
MUI => 'modifiedUserInteraction',
};
my $CVSS2_METRIC_VALUES = {
AV => {N => 'NETWORK', A => 'ADJACENT_NETWORK', L => 'LOCAL'},
AC => {H => 'HIGH', M => 'MEDIUM', L => 'LOW'},
Au => {M => 'MULTIPLE', S => 'SINGLE', N => 'NONE'},
C => {N => 'NONE', P => 'PARTIAL', C => 'COMPLETE'},
I => {N => 'NONE', P => 'PARTIAL', C => 'COMPLETE'},
A => {N => 'NONE', P => 'PARTIAL', C => 'COMPLETE'},
E => {U => 'UNPROVEN', POC => 'PROOF_OF_CONCEPT', F => 'FUNCTIONAL', H => 'HIGH', ND => 'NOT_DEFINED'},
RL => {OF => 'OFFICIAL_FIX', TF => 'TEMPORARY_FIX', W => 'WORKAROUND', U => 'UNAVAILABLE', ND => 'NOT_DEFINED'},
RC => {UC => 'UNCONFIRMED', UR => 'UNCORROBORATED', C => 'CONFIRMED', ND => 'NOT_DEFINED'},
CDP => {N => 'NONE', L => 'LOW', LM => 'LOW_MEDIUM', MH => 'MEDIUM_HIGH', H => 'HIGH', ND => 'NOT_DEFINED'},
TD => {N => 'NONE', L => 'LOW', M => 'MEDIUM', H => 'HIGH', ND => 'NOT_DEFINED'},
CR => {L => 'LOW', M => 'MEDIUM', H => 'HIGH', ND => 'NOT_DEFINED'},
IR => {L => 'LOW', M => 'MEDIUM', H => 'HIGH', ND => 'NOT_DEFINED'},
AR => {L => 'LOW', M => 'MEDIUM', H => 'HIGH', ND => 'NOT_DEFINED'},
};
my $CVSS3_METRIC_VALUES = {
AV => {N => 'NETWORK', A => 'ADJACENT_NETWORK', L => 'LOCAL', P => 'PHYSICAL'},
AC => {L => 'LOW', H => 'HIGH'},
PR => {N => 'NONE', L => 'LOW', H => 'HIGH'},
UI => {N => 'NONE', R => 'REQUIRED'},
S => {U => 'UNCHANGED', C => 'CHANGED'},
C => {N => 'NONE', L => 'LOW', H => 'HIGH'},
I => {N => 'NONE', L => 'LOW', H => 'HIGH'},
A => {N => 'NONE', L => 'LOW', H => 'HIGH'},
E => {X => 'NOT_DEFINED', U => 'UNPROVEN', P => 'PROOF_OF_CONCEPT', F => 'FUNCTIONAL', H => 'HIGH'},
RL => {X => 'NOT_DEFINED', O => 'OFFICIAL_FIX', T => 'TEMPORARY_FIX', W => 'WORKAROUND', U => 'UNAVAILABLE'},
RC => {X => 'NOT_DEFINED', U => 'UNKNOWN', R => 'REASONABLE', C => 'CONFIRMED'},
MA => {X => 'NOT_DEFINED', N => 'NONE', L => 'LOW', H => 'HIGH'},
MAC => {X => 'NOT_DEFINED', L => 'LOW', H => 'HIGH'},
MAV => {X => 'NOT_DEFINED', N => 'NETWORK', A => 'ADJACENT_NETWORK', L => 'LOCAL', P => 'PHYSICAL'},
MC => {X => 'NOT_DEFINED', N => 'NONE', L => 'LOW', H => 'HIGH'},
MI => {X => 'NOT_DEFINED', N => 'NONE', L => 'LOW', H => 'HIGH'},
MPR => {X => 'NOT_DEFINED', N => 'NONE', L => 'LOW', H => 'HIGH'},
MS => {X => 'NOT_DEFINED', U => 'UNCHANGED', C => 'CHANGED'},
MUI => {X => 'NOT_DEFINED', N => 'NONE', R => 'REQUIRED'},
};
sub decode_cvss_vector_string {
my $vector_string = shift;
my $decoded = {};
if ($vector_string =~ /^CVSS:3[.][0-1]\/(.*)/) {
my %cvss = split /[:\/]/, $1;
foreach my $metric (keys %cvss) {
if (defined $CVSS3_METRIC_LABEL->{$metric}) {
my $value = $cvss{$metric};
my $label = $CVSS3_METRIC_LABEL->{$metric};
$decoded->{$label} = $CVSS3_METRIC_VALUES->{$metric}->{$value} || $value;
}
}
}
else {
my %cvss = split /[:\/]/, $vector_string;
foreach my $metric (keys %cvss) {
if (defined $CVSS2_METRIC_LABEL->{$metric}) {
my $value = $cvss{$metric};
my $label = $CVSS2_METRIC_LABEL->{$metric};
$decoded->{$label} = $CVSS2_METRIC_VALUES->{$metric}->{$value} || $value;
}
}
}
return $decoded;
}
1;
__END__
=encoding utf-8
=head1 NAME
CSAF::Util::CVSS - CVSS utility for CSAF
=head1 SYNOPSIS
use CSAF::Util::CVSS qw(decode_cvss_vector_string);
say Dumper(decode_cvss_vector_string('CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L/E:F/RL:O/RC:C'));
=head1 DESCRIPTION
CVSS utility for L<CSAF>.
=head2 FUNCTIONS
=over
=item decode_cvss_vector_string
Decode the provided CVSS (v2.0 or v3.x) vector string.
my $decoded = decode_cvss_vector_string('CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L/E:F/RL:O/RC:C');
say $decoded->{attackVector}; # LOCAL
=back
=head1 SUPPORT
=head2 Bugs / Feature Requests
Please report any bugs or feature requests through the issue tracker
at L<https://github.com/giterlizzi/perl-CSAF/issues>.
You will be notified automatically of any progress on your issue.
=head2 Source Code
This is open source software. The code repository is available for
public review and contribution under the terms of the license.
L<https://github.com/giterlizzi/perl-CSAF>
git clone https://github.com/giterlizzi/perl-CSAF.git
=head1 AUTHOR
=over 4
=item * Giuseppe Di Terlizzi <gdt@cpan.org>
=back
=head1 LICENSE AND COPYRIGHT
This software is copyright (c) 2023-2025 by Giuseppe Di Terlizzi.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
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