From 179ff58b0980f348821c727c2fa79a5eca310901 Mon Sep 17 00:00:00 2001
From: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Date: Fri, 13 Jan 2017 16:40:59 +0100
Subject: [PATCH] Bug 17903: Fix possible SQL injection in serial claims

To recreate:
/cgi-bin/koha/serials/claims.pl?serialid=1)and%20(select*from(select(sleep(20)))a)--%20&letter_code=0

Notice the delay.

The SQL query is not constructed correctly, placeholders must be used.

This vulnerability has been reported by MDSec.

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
---
 C4/Letters.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/C4/Letters.pm b/C4/Letters.pm
index 3ff39b15f9..d62f8278f5 100644
--- a/C4/Letters.pm
+++ b/C4/Letters.pm
@@ -501,10 +501,10 @@ sub SendAlerts {
                 return { error => "no_order_selected" };
             }
 
-            $strsth .= join( ",", @$externalid ) . ")";
+            $strsth .= join( ",", ('?') x @$externalid ) . ")";
             $action = "CLAIM ISSUE";
             $sthorders = $dbh->prepare($strsth);
-            $sthorders->execute;
+            $sthorders->execute( @$externalid );
             $dataorders = $sthorders->fetchall_arrayref( {} );
         }
 
-- 
2.39.5