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

…oring comments
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pitbulk committed Feb 27, 2018
1 parent 414d144 commit 048a544730930f86e46804387a6b6fad50d8176f
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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"
@@ -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 "support@onelogin.com", @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))
@@ -0,0 +1 @@
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