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|
#!/usr/bin/perl
#
# Compare the Debian list of CVEs with the NVD list of CVEs using CPE
# ids, to see if the set of affected packages match.
use warnings;
use strict;
use XML::Simple;
use Data::Dumper;
use Getopt::Std;
use vars qw(%opts $debug %cpealiases %cpemap %cperevmap %cvemap
%reportedmissing);
$| = 1;
getopts('d', \%opts);
$debug = exists $opts{'d'} ? 1 : 0;
cpe_load_aliases("data/CPE/aliases");
cpe_load_list("data/CPE/list");
open (my $fh, "<", "data/CVE/list") || die;
my $cve;
while (<$fh>) {
chomp;
$cve = $1 if (m/^(CVE-\S+)\s*/);
s/^(\s+)\[\S+\] /$1/; # Trim away distribution name
if ( m/^\s+- (\S+)\S*/
# && ! m/<not-affected>/
) {
my $srcpkg = $1;
unless (exists $cpemap{$srcpkg}) {
my $cpe = "missing-cpe-for-$srcpkg";;
cpe_map_debiansrc($cpe, $srcpkg);
}
if (exists $cvemap{$cve}) {
push(@{$cvemap{$cve}}, $srcpkg);
} else {
$cvemap{$cve} = [$srcpkg];
}
}
}
close $fh;
#
# Fetched from https://nvd.nist.gov/download.aspx
#
for my $year (reverse 2002 .. (gmtime())[5]+1900) {
my $cvelist = "nvdcve-2.0-$year.xml";
print STDERR "Loading $cvelist\n" if $debug;
my $ref = XMLin("data/nvd2/" . $cvelist);
for my $cve (sort {$b cmp $a} keys %{$ref->{entry}}) {
print STDERR "Checking $cve\n" if $debug;
my $entry = $ref->{entry}->{$cve};
my %info;
my @debiancpe = get_debian_cpe($cve);
for my $cpe (@debiancpe) {
$info{cpe_expand_product_alias($cpe)} = 1;
}
my @products;
if (exists $entry->{'vuln:vulnerable-software-list'}->{'vuln:product'}) {
if ("ARRAY" eq ref $entry->{'vuln:vulnerable-software-list'}->{'vuln:product'}) {
@products = @{$entry->{'vuln:vulnerable-software-list'}->{'vuln:product'}};
} else {
@products = ($entry->{'vuln:vulnerable-software-list'}->{'vuln:product'});
}
}
unless (1 || @products) {
print STDERR Dumper($entry);
}
for my $cpe (@products) {
if (exists $info{cpe_expand_product_alias(cpe_product($cpe))}) {
$info{cpe_expand_product_alias(cpe_product($cpe))} += 2;
} else {
$info{cpe_expand_product_alias(cpe_product($cpe))} = 2;
}
}
for my $cpe (sort keys %info) {
if (1 == $info{$cpe}) {
my %shortlist;
map { $shortlist{cpe_product($_)} = 1 } @products;
my $cpelist = join(", ", keys %shortlist);
print STDERR "warning: $cve in Debian refer to $cpe, while NVD do not (found $cpelist).\n"
} elsif (2 == $info{$cpe}) {
if (exists $cperevmap{$cpe}) {
print STDERR "warning: $cve in NVD is not refering to $cpe found in Debian.\n"
}
} elsif (3 == $info{$cpe}) {
}
}
}
print STDERR "Done loading $cvelist\n" if $debug;
}
for my $missing (sort { $reportedmissing{$a} <=> $reportedmissing{$b} }
keys %reportedmissing) {
my $count = $reportedmissing{$missing};
print STDERR "error: missing CPE ID for $missing ($count)\n";
}
sub get_debian_cpe {
my ($cve) = shift;
my %cpe;
for my $binpkg (@{$cvemap{$cve}}) {
if (exists $cpemap{$binpkg}) {
$cpe{$cpemap{$binpkg}} = 1;
} else {
$reportedmissing{$binpkg} = exists $reportedmissing{$binpkg} ?
$reportedmissing{$binpkg} + 1 : 1;
}
}
return sort keys %cpe;
}
sub cpe_product {
my $cpe = shift;
return join(":", (split(/:/, $cpe))[0..3]);
}
sub cpe_map_debiansrc {
my ($cpe, $srcpkg) = @_;
if ($cpe) {
$cpemap{$srcpkg} = $cpe;
$cperevmap{$cpe} = $srcpkg;
}
}
sub cpe_load_list {
my $filename = shift;
open(my $fh, "<", $filename) ||
die "unable to load CPE list from $filename";
while (<$fh>) {
chomp;
s/#.*$//; # Remove comments
my ($srcpkg, $cpe) = split(/;/);
$cpe = cpe_expand_product_alias($cpe);
cpe_map_debiansrc($cpe, $srcpkg);
}
close $fh;
}
sub cpe_load_aliases {
my $filename = shift;
open (my $fh, "<", $filename) || die;
my $lastcpe = "";
while (<$fh>) {
chomp;
s/#.*$//; # Remove comments
unless ($_) {
$lastcpe = "";
next;
}
if ($lastcpe) {
$cpealiases{$_} = $lastcpe;
} else {
$cpealiases{$_} = $_;
$lastcpe = $_;
}
}
close ($fh);
}
sub cpe_expand_product_alias {
my $cpe = shift;
my $retval = $cpe;
if (defined $cpe && exists $cpealiases{$cpe}) {
$retval = $cpealiases{$cpe};
}
return $retval;
}
|
