From c69a364e4b1ceb34ba837bc4441a95db89491e7c Mon Sep 17 00:00:00 2001
From: Jared Camins-Esakov <jcamins@cpbibliography.com>
Date: Mon, 15 Oct 2012 11:58:30 -0400
Subject: [PATCH] Bug 3652: close XSS vulnerabilities in opac-export

The opac-export.pl script had a number of XSS vulnerabilities relating
to its error handling.

To test:
1) Go to /cgi-bin/koha/opac-export.pl?op=export&bib=2&format=<h2>evil</h2>
   (substituting a valid biblionumber for the '2')
2) Notice that "evil" is rendered as an h2 heading.
3) Apply patch.
4) Notice that you now see the h2 tags, and they are not rendered by
   the browser.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
---
 opac/opac-export.pl | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/opac/opac-export.pl b/opac/opac-export.pl
index fb8dee7a1e..002c88e4ec 100755
--- a/opac/opac-export.pl
+++ b/opac/opac-export.pl
@@ -32,6 +32,7 @@ my $query = new CGI;
 my $op=$query->param("op")||''; #op=export is currently the only use
 my $format=$query->param("format")||'utf8';
 my $biblionumber = $query->param("bib")||0;
+$biblionumber = int($biblionumber);
 my ($marc, $error)= ('','');
 
 $marc = GetMarcBiblio($biblionumber, 1) if $biblionumber;
@@ -41,18 +42,23 @@ if(!$marc) {
 }
 elsif ($format =~ /endnote/) {
     $marc = marc2endnote($marc);
+    $format = 'endnote';
 }
 elsif ($format =~ /marcxml/) {
     $marc = marc2marcxml($marc);
+    $format = 'marcxml';
 }
 elsif ($format=~ /mods/) {
     $marc = marc2modsxml($marc);
+    $format = 'mods';
 }
 elsif ($format =~ /ris/) {
     $marc = marc2ris($marc);
+    $format = 'ris';
 }
 elsif ($format =~ /bibtex/) {
     $marc = marc2bibtex(C4::Biblio::GetMarcBiblio($biblionumber),$biblionumber);
+    $format = 'bibtex';
 }
 elsif ($format =~ /dc/) {
     ($error,$marc) = marc2dcxml($marc,1);
@@ -61,14 +67,17 @@ elsif ($format =~ /dc/) {
 elsif ($format =~ /marc8/) {
     ($error,$marc) = changeEncoding($marc,"MARC","MARC21","MARC-8");
     $marc = $marc->as_usmarc() unless $error;
+    $format = 'marc8';
 }
 elsif ($format =~ /utf8/) {
     C4::Charset::SetUTF8Flag($marc,1);
     $marc = $marc->as_usmarc();
+    $format = 'utf8';
 }
 elsif ($format =~ /marcstd/) {
     C4::Charset::SetUTF8Flag($marc,1);
     ($error,$marc) = marc2marc($marc, 'marcstd', C4::Context->preference('marcflavour'));
+    $format = 'marcstd';
 }
 else {
     $error= "Format $format is not supported.";
@@ -78,7 +87,7 @@ if ($error){
     print $query->header();
     print $query->start_html();
     print "<h1>An error occurred </h1>";
-    print $error;
+    print $query->escapeHTML("$error");
     print $query->end_html();
 }
 else {
-- 
2.39.5