From: Frédéric Buclin <LpSolit@gmail.com>
Date: Wed, 16 Oct 2013 17:05:29 +0000 (+0200)
Subject: Bug 913904: (CVE-2013-1734) [SECURITY] CSRF when updating attachments
X-Git-Tag: bugzilla-4.4.1~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=09894bd56a565dcd0cd9536ffce4769ddb7830d0;p=thirdparty%2Fbugzilla.git

Bug 913904: (CVE-2013-1734) [SECURITY] CSRF when updating attachments
r=dkl a=sgreen
---

diff --git a/attachment.cgi b/attachment.cgi
index 903fe5b596..f728db4844 100755
--- a/attachment.cgi
+++ b/attachment.cgi
@@ -648,19 +648,22 @@ sub update {
         $attachment->set_filename(scalar $cgi->param('filename'));
 
         # Now make sure the attachment has not been edited since we loaded the page.
-        if (defined $cgi->param('delta_ts')
-            && $cgi->param('delta_ts') ne $attachment->modification_time)
-        {
-            ($vars->{'operations'}) = $bug->get_activity($attachment->id, $cgi->param('delta_ts'));
+        my $delta_ts = $cgi->param('delta_ts');
+        my $modification_time = $attachment->modification_time;
 
-            # The token contains the old modification_time. We need a new one.
-            $cgi->param('token', issue_hash_token([$attachment->id, $attachment->modification_time]));
+        if ($delta_ts && $delta_ts ne $modification_time) {
+            datetime_from($delta_ts)
+              or ThrowCodeError('invalid_timestamp', { timestamp => $delta_ts });
+            ($vars->{'operations'}) = $bug->get_activity($attachment->id, $delta_ts);
 
             # If the modification date changed but there is no entry in
             # the activity table, this means someone commented only.
             # In this case, there is no reason to midair.
             if (scalar(@{$vars->{'operations'}})) {
-                $cgi->param('delta_ts', $attachment->modification_time);
+                $cgi->param('delta_ts', $modification_time);
+                # The token contains the old modification_time. We need a new one.
+                $cgi->param('token', issue_hash_token([$attachment->id, $modification_time]));
+
                 $vars->{'attachment'} = $attachment;
 
                 print $cgi->header();