From 58b92d3b0245f6565a7ff34e78fce1e9ec56b355 Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manishearth@gmail.com>
Date: Thu, 17 Apr 2014 18:27:05 +0200
Subject: Bug 968576: [SECURITY] Dangerous control characters allowed in
 Bugzilla text r=glob a=justdave

---
 Bugzilla/Template.pm                        | 12 ++++++++++++
 Bugzilla/Util.pm                            |  4 ++++
 template/en/default/email/bugmail.txt.tmpl  |  2 +-
 template/en/default/email/flagmail.txt.tmpl |  2 +-
 4 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/Bugzilla/Template.pm b/Bugzilla/Template.pm
index 56d31dd2d..6f7900054 100644
--- a/Bugzilla/Template.pm
+++ b/Bugzilla/Template.pm
@@ -678,6 +678,18 @@ sub create {
                 my ($data) = @_;
                 return encode_base64($data);
             },
+
+            # Strips out control characters excepting whitespace
+            strip_control_chars => sub {
+                my ($data) = @_;
+                state $use_utf8 = Bugzilla->params->{'utf8'};
+                # Only run for utf8 to avoid issues with other multibyte encodings 
+                # that may be reassigning meaning to ascii characters.
+                if ($use_utf8) {
+                    $data =~ s/(?![\t\r\n])[[:cntrl:]]//g;
+                }
+                return $data;
+            },
             
             # HTML collapses newlines in element attributes to a single space,
             # so form elements which may have whitespace (ie comments) need
diff --git a/Bugzilla/Util.pm b/Bugzilla/Util.pm
index 5f359c38c..9bcb6962d 100644
--- a/Bugzilla/Util.pm
+++ b/Bugzilla/Util.pm
@@ -75,6 +75,10 @@ sub html_quote {
     state $use_utf8 = Bugzilla->params->{'utf8'};
 
     if ($use_utf8) {
+        # Remove control characters if the encoding is utf8.
+        # Other multibyte encodings may be using this range; so ignore if not utf8.
+        $var =~ s/(?![\t\r\n])[[:cntrl:]]//g;
+
         # Remove the following characters because they're
         # influencing BiDi:
         # --------------------------------------------------------
diff --git a/template/en/default/email/bugmail.txt.tmpl b/template/en/default/email/bugmail.txt.tmpl
index 95cda7f10..1f04db7b1 100644
--- a/template/en/default/email/bugmail.txt.tmpl
+++ b/template/en/default/email/bugmail.txt.tmpl
@@ -19,7 +19,7 @@
 [%- IF comment.count %]
 --- Comment #[% comment.count %] from [% comment.author.identity %] ---
 [% END %]
-[%+ comment.body_full({ is_bugmail => 1, wrap => 1 }) %]
+[%+ comment.body_full({ is_bugmail => 1, wrap => 1 }) FILTER strip_control_chars %]
 [% END %]
 
 [% IF referenced_bugs.size %]
diff --git a/template/en/default/email/flagmail.txt.tmpl b/template/en/default/email/flagmail.txt.tmpl
index 26b60143d..fe514e103 100644
--- a/template/en/default/email/flagmail.txt.tmpl
+++ b/template/en/default/email/flagmail.txt.tmpl
@@ -69,7 +69,7 @@ Attachment [% attidsummary %]
 [%-# .defined is necessary to avoid a taint issue, see bug 509794. %]
 [% IF Bugzilla.cgi.param("comment").defined && Bugzilla.cgi.param("comment").length > 0 %]
 ------- Additional Comments from [% user.identity %]
-[%+ Bugzilla.cgi.param("comment") %]
+[%+ Bugzilla.cgi.param("comment") FILTER strip_control_chars %]
 [% END %]
 
 [%- END %]
-- 
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