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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 vars qw($debug %cpemap %cperevmap %cvemap %reportedmissing);
$| = 1;
my %cpealiases;
open (my $fh, "<", "data/CPE/aliases") || die;
my $lastcpe = "";
while (<$fh>) {
chomp;
s/#.*$//; # Remove comments
unless ($_) {
$lastcpe = "";
next;
}
if ($lastcpe) {
$cpealiases{$_} = $lastcpe;
} else {
$cpealiases{$_} = $_;
$lastcpe = $_;
}
}
close ($fh);
sub cpe_expand_alias {
my $cpe = shift;
my $retval = $cpe;
if (defined $cpe && exists $cpealiases{$cpe}) {
$retval = $cpealiases{$cpe};
}
return $retval;
}
open($fh, "<", "data/CPE/list") || die;
while (<$fh>) {
chomp;
s/#.*$//; # Remove comments
my ($binpkg, $cpe) = split(/;/);
$cpe = cpe_expand_alias($cpe);
# $cpe = "unknown-$binpkg" unless $cpe;
if ($cpe) {
$cpemap{$binpkg} = $cpe;
$cperevmap{$cpe} = $binpkg;
}
}
close $fh;
open ($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;
if (exists $cvemap{$cve}) {
push(@{$cvemap{$cve}}, $srcpkg);
} else {
$cvemap{$cve} = [$srcpkg];
}
}
}
close $fh;
#
# Fetched from http://static.nvd.nist.gov/feeds/xml/cve/nvdcve-2.0-2008.xml
#
for my $cvelist
(
"nvdcve-2.0-2011.xml",
# "nvdcve-2.0-2010.xml",
# "nvdcve-2.0-2009.xml",
# "nvdcve-2.0-2008.xml",
# "nvdcve-2.0-2007.xml",
# "nvdcve-2.0-2006.xml",
# "nvdcve-2.0-2005.xml",
# "nvdcve-2.0-2004.xml",
) {
print "Loading $cvelist\n" if $debug;
my $ref = XMLin("../../" . $cvelist);
for my $cve (sort {$b cmp $a} keys %{$ref->{entry}}) {
print "Checking $cve\n" if $debug;
my $entry = $ref->{entry}->{$cve};
my %info;
my @debiancpe = get_debian_cpe($cve);
for my $cpe (@debiancpe) {
$info{cpe_expand_alias($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'});
}
}
for my $cpe (@products) {
if (exists $info{cpe_expand_alias(cpe_product($cpe))}) {
$info{cpe_expand_alias(cpe_product($cpe))} += 2;
} else {
$info{cpe_expand_alias(cpe_product($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 "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]);
}
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