Fix vulnerability CVE-2017-11428. Process text of nodes properly, ign…

…oring comments

lib/onelogin/ruby-saml/idp_metadata_parser.rb

@@ -192,7 +192,7 @@ def idp_name_id_format
           "md:IDPSSODescriptor/md:NameIDFormat",
           namespace
         )
-        node.text if node
+        Utils.element_text(node)
       end
 
       # @param binding_priority [Array]
@@ -281,14 +281,14 @@ def certificates
             unless signing_nodes.empty?
               certs['signing'] = []
               signing_nodes.each do |cert_node|
-                certs['signing'] << cert_node.text
+                certs['signing'] << Utils.element_text(cert_node)
               end
             end
 
             unless encryption_nodes.empty?
               certs['encryption'] = []
               encryption_nodes.each do |cert_node|
-                certs['encryption'] << cert_node.text
+                certs['encryption'] << Utils.element_text(cert_node)
               end
             end
           end

lib/onelogin/ruby-saml/logoutresponse.rb

@@ -80,7 +80,7 @@ def issuer
             "/p:LogoutResponse/a:Issuer",
             { "p" => PROTOCOL, "a" => ASSERTION }
           )
-          node.nil? ? nil : node.text
+          Utils.element_text(node)
         end
       end
 
@@ -100,7 +100,7 @@ def status_message
             "/p:LogoutResponse/p:Status/p:StatusMessage",
             { "p" => PROTOCOL, "a" => ASSERTION }
           )
-          node.text if node
+          Utils.element_text(node)
         end
       end
 

lib/onelogin/ruby-saml/response.rb

@@ -71,10 +71,7 @@ def is_valid?(collect_errors = false)
       # @return [String] the NameID provided by the SAML response from the IdP.
       #
       def name_id
-        @name_id ||=
-          if name_id_node
-            name_id_node.text
-          end
+        @name_id ||= Utils.element_text(name_id_node)
       end
 
       alias_method :nameid, :name_id
@@ -159,14 +156,14 @@ def attributes
                 if (e.elements.nil? || e.elements.size == 0)
                   # SAMLCore requires that nil AttributeValues MUST contain xsi:nil XML attribute set to "true" or "1"
                   # otherwise the value is to be regarded as empty.
-                  ["true", "1"].include?(e.attributes['xsi:nil']) ? nil : e.text.to_s
+                  ["true", "1"].include?(e.attributes['xsi:nil']) ? nil : Utils.element_text(e)
                 # explicitly support saml2:NameID with saml2:NameQualifier if supplied in attributes
                 # this is useful for allowing eduPersonTargetedId to be passed as an opaque identifier to use to
                 # identify the subject in an SP rather than email or other less opaque attributes
                 # NameQualifier, if present is prefixed with a "/" to the value
                 else
                  REXML::XPath.match(e,'a:NameID', { "a" => ASSERTION }).collect{|n|
-                    (n.attributes['NameQualifier'] ? n.attributes['NameQualifier'] +"/" : '') + n.text.to_s
+                    (n.attributes['NameQualifier'] ? n.attributes['NameQualifier'] +"/" : '') + Utils.element_text(n)
                   }
                 end
               }
@@ -238,8 +235,7 @@ def status_message
             { "p" => PROTOCOL }
           )
           if nodes.size == 1
-            node = nodes[0]
-            node.text if node
+            Utils.element_text(nodes.first)
           end
         end
       end
@@ -272,7 +268,6 @@ def not_on_or_after
       #
       def issuers
         @issuers ||= begin
-          issuers = []
           issuer_response_nodes = REXML::XPath.match(
             document,
             "/p:Response/a:Issuer",
@@ -292,10 +287,7 @@ def issuers
           end
 
           nodes = issuer_response_nodes + issuer_assertion_nodes
-          nodes.each do |node|
-            issuers << node.text if node.text
-          end
-          issuers.uniq
+          nodes.map { |node| Utils.element_text(node) }.compact.uniq
         end
       end
 
@@ -329,14 +321,8 @@ def destination
       #
       def audiences
         @audiences ||= begin
-          audiences = []
           nodes = xpath_from_signed_assertion('/a:Conditions/a:AudienceRestriction/a:Audience')
-          nodes.each do |node|
-            if node && node.text
-              audiences << node.text
-            end
-          end
-          audiences
+          nodes.map { |node| Utils.element_text(node) }.compact
         end
       end
 

lib/onelogin/ruby-saml/slo_logoutrequest.rb

@@ -60,7 +60,7 @@ def is_valid?(collect_errors = false)
       def name_id
         @name_id ||= begin
           node = REXML::XPath.first(document, "/p:LogoutRequest/a:NameID", { "p" => PROTOCOL, "a" => ASSERTION })
-          node.nil? ? nil : node.text
+          Utils.element_text(node)
         end
       end
 
@@ -93,7 +93,7 @@ def issuer
             "/p:LogoutRequest/a:Issuer",
             { "p" => PROTOCOL, "a" => ASSERTION }
           )
-          node.nil? ? nil : node.text
+          Utils.element_text(node)
         end
       end
 
@@ -115,18 +115,13 @@ def not_on_or_after
       # @return [Array] Gets the SessionIndex if exists (Supported multiple values). Empty Array if none found
       #
       def session_indexes
-        s_indexes = []
         nodes = REXML::XPath.match(
           document,
           "/p:LogoutRequest/p:SessionIndex",
           { "p" => PROTOCOL }
         )
 
-        nodes.each do |node|
-          s_indexes << node.text
-        end
-
-        s_indexes
+        nodes.map { |node| Utils.element_text(node) }
       end
 
       private

lib/onelogin/ruby-saml/utils.rb

@@ -173,7 +173,7 @@ def self.decrypt_data(encrypted_node, private_key)
           "./xenc:CipherData/xenc:CipherValue",
           { 'xenc' => XENC }
         )
-        node = Base64.decode64(cipher_value.text)
+        node = Base64.decode64(element_text(cipher_value))
         encrypt_method = REXML::XPath.first(
           encrypt_data,
           "./xenc:EncryptionMethod",
@@ -201,7 +201,7 @@ def self.retrieve_symmetric_key(encrypt_data, private_key)
           "xenc" => XENC
         )
 
-        cipher_text = Base64.decode64(encrypted_symmetric_key_element.text)
+        cipher_text = Base64.decode64(element_text(encrypted_symmetric_key_element))
 
         encrypt_method = REXML::XPath.first(
           encrypted_key,
@@ -281,6 +281,13 @@ def self.uri_match?(destination_url, settings_url)
       def self.original_uri_match?(destination_url, settings_url)
         destination_url == settings_url
       end
+
+      # Given a REXML::Element instance, return the concatenation of all child text nodes. Assumes
+      # that there all children other than text nodes can be ignored (e.g. comments). If nil is
+      # passed, nil will be returned.
+      def self.element_text(element)
+        element.texts.join if element
+      end
     end
   end
 end

lib/xml_security.rb

@@ -29,6 +29,7 @@
 require 'nokogiri'
 require "digest/sha1"
 require "digest/sha2"
+require "onelogin/ruby-saml/utils"
 require "onelogin/ruby-saml/error_handling"
 
 module XMLSecurity
@@ -206,7 +207,7 @@ def validate_document(idp_cert_fingerprint, soft = true, options = {})
       )
 
       if cert_element
-        base64_cert = cert_element.text
+        base64_cert = OneLogin::RubySaml::Utils.element_text(cert_element)
         cert_text = Base64.decode64(base64_cert)
         begin
           cert = OpenSSL::X509::Certificate.new(cert_text)
@@ -249,7 +250,7 @@ def validate_document_with_cert(idp_cert)
       )
 
       if cert_element
-        base64_cert = cert_element.text
+        base64_cert = OneLogin::RubySaml::Utils.element_text(cert_element)
         cert_text = Base64.decode64(base64_cert)
         begin
           cert = OpenSSL::X509::Certificate.new(cert_text)
@@ -296,8 +297,8 @@ def validate_signature(base64_cert, soft = true)
         sig_element,
         "./ds:SignatureValue",
         {"ds" => DSIG}
-      ).text
-      signature = Base64.decode64(base64_signature)
+      )
+      signature = Base64.decode64(OneLogin::RubySaml::Utils.element_text(base64_signature))
 
       # canonicalization method
       canon_algorithm = canon_algorithm REXML::XPath.first(
@@ -338,8 +339,8 @@ def validate_signature(base64_cert, soft = true)
         ref,
         "//ds:DigestValue",
         { "ds" => DSIG }
-      ).text
-      digest_value = Base64.decode64(encoded_digest_value)
+      )
+      digest_value = Base64.decode64(OneLogin::RubySaml::Utils.element_text(encoded_digest_value))
 
       unless digests_match?(hash, digest_value)
         @errors << "Digest mismatch"

test/response_test.rb

@@ -69,6 +69,21 @@ class RubySamlTest < Minitest::Test
       assert_includes ampersands_response.errors, "SAML Response must contain 1 assertion"
     end
 
+    describe "Prevent node text with comment attack (VU#475445)" do
+      before do
+        @response = OneLogin::RubySaml::Response.new(read_response('response_node_text_attack.xml.base64'))
+      end
+
+      it "receives the full NameID when there is an injected comment" do
+        assert_equal "[email protected]", @response.name_id
+      end
+
+      it "receives the full AttributeValue when there is an injected comment" do
+        assert_equal "smith", @response.attributes["surname"]
+      end
+
+    end
+
     describe "Prevent XEE attack" do
       before do
         @response = OneLogin::RubySaml::Response.new(fixture(:attackxee))

test/responses/response_node_text_attack.xml.base64

@@ -0,0 +1 @@
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