From 8342d0f7a04e0956218dbfa687a0f60f358f16da Mon Sep 17 00:00:00 2001
From: Byron Jones <glob@mozilla.com>
Date: Mon, 13 Apr 2015 14:16:13 +0800
Subject: Bug 1031035: xmlrpc can be DoS'd with billion laughs attack

---
 Bugzilla/WebService/Server/XMLRPC.pm | 8 ++++++++
 importxml.pl                         | 3 +++
 2 files changed, 11 insertions(+)

diff --git a/Bugzilla/WebService/Server/XMLRPC.pm b/Bugzilla/WebService/Server/XMLRPC.pm
index 69ba4c0d8..834ea60bf 100644
--- a/Bugzilla/WebService/Server/XMLRPC.pm
+++ b/Bugzilla/WebService/Server/XMLRPC.pm
@@ -140,6 +140,14 @@ use Bugzilla::WebService::Constants qw(XMLRPC_CONTENT_TYPE_WHITELIST);
 use Bugzilla::WebService::Util qw(fix_credentials);
 use Scalar::Util qw(tainted);
 
+sub new {
+    my $self = shift->SUPER::new(@_);
+    # Initialise XML::Parser to not expand references to entities, to prevent DoS
+    require XML::Parser;
+    $self->{_parser}->parser(parser => XML::Parser->new( NoExpand => 1, Handlers => { Default => sub {} } ));
+    return $self;
+}
+
 sub deserialize {
     my $self = shift;
 
diff --git a/importxml.pl b/importxml.pl
index 19be9a61a..63004af6f 100755
--- a/importxml.pl
+++ b/importxml.pl
@@ -1278,6 +1278,9 @@ my $twig = XML::Twig->new(
     },
     start_tag_handlers => { bugzilla => \&init }
 );
+# Prevent DoS using the billion laughs attack.
+$twig->{NoExpand} = 1;
+
 $twig->parse($xml);
 my $root       = $twig->root;
 my $maintainer = $root->{'att'}->{'maintainer'};
-- 
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