Class: Brakeman::CheckSanitizeMethods

Inherits:
BaseCheck show all
Defined in:
lib/brakeman/checks/check_sanitize_methods.rb

Overview

sanitize and sanitize_css are vulnerable: CVE-2013-1855 and CVE-2013-1857

Constant Summary

Constants inherited from BaseCheck

BaseCheck::CONFIDENCE

Constants included from Util

Util::ALL_COOKIES, Util::ALL_PARAMETERS, Util::COOKIES, Util::COOKIES_SEXP, Util::PARAMETERS, Util::PARAMS_SEXP, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_COOKIES, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::SESSION, Util::SESSION_SEXP

Constants inherited from SexpProcessor

SexpProcessor::VERSION

Instance Attribute Summary

Attributes inherited from BaseCheck

#tracker, #warnings

Attributes inherited from SexpProcessor

#context, #env, #expected

Instance Method Summary collapse

Methods inherited from BaseCheck

#add_result, inherited, #initialize, #process_call, #process_cookies, #process_default, #process_dstr, #process_if, #process_params

Methods included from Util

#array?, #block?, #call?, #camelize, #class_name, #constant?, #contains_class?, #context_for, #cookies?, #false?, #file_by_name, #file_for, #github_url, #hash?, #hash_access, #hash_insert, #hash_iterate, #integer?, #make_call, #node_type?, #number?, #params?, #pluralize, #rails_version, #regexp?, #relative_path, #request_env?, #request_value?, #result?, #set_env_defaults, #sexp?, #string?, #string_interp?, #symbol?, #table_to_csv, #template_path_to_name, #true?, #truncate_table, #underscore

Methods included from ProcessorHelper

#current_file_name, #process_all, #process_all!, #process_call_args, #process_call_defn?, #process_class, #process_module

Methods inherited from SexpProcessor

#in_context, #initialize, #process, processors, #scope

Constructor Details

This class inherits a constructor from Brakeman::BaseCheck

Instance Method Details

#check_cve_2013_1855 ⇒ Object 



34
35
36
 
# File 'lib/brakeman/checks/check_sanitize_methods.rb', line 34

def check_cve_2013_1855
  check_for_cve :sanitize_css, :CVE_2013_1855, "https://groups.google.com/d/msg/rubyonrails-security/4_QHo4BqnN8/_RrdfKk12I4J"
end

#check_cve_2013_1857 ⇒ Object 



38
39
40
 
# File 'lib/brakeman/checks/check_sanitize_methods.rb', line 38

def check_cve_2013_1857
  check_for_cve :sanitize, :CVE_2013_1857, "https://groups.google.com/d/msg/rubyonrails-security/zAAU7vGTPvI/1vZDWXqBuXgJ"
end

#check_cve_2018_8048 ⇒ Object 



77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
 
# File 'lib/brakeman/checks/check_sanitize_methods.rb', line 77

def check_cve_2018_8048
  if loofah_vulnerable_cve_2018_8048?
    message = "Loofah #{tracker.config.gem_version(:loofah)} is vulnerable (CVE-2018-8048). Upgrade to 2.1.2"

    if tracker.find_call(:target => false, :method => :sanitize).any?
      confidence = :high
    else
      confidence = :medium
    end

    warn :warning_type => "Cross-Site Scripting",
      :warning_code => :CVE_2018_8048,
      :message => message,
      :gem_info => gemfile_or_environment,
      :confidence => confidence,
      :link_path => "https://github.com/flavorjones/loofah/issues/144"
  end
end

#check_for_cve(method, code, link) ⇒ Object 



42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
 
# File 'lib/brakeman/checks/check_sanitize_methods.rb', line 42

def check_for_cve method, code, link
  tracker.find_call(:target => false, :method => method).each do |result|
    next if duplicate? result
    add_result result

    message = "Rails #{rails_version} has a vulnerability in #{method}: upgrade to #{@fix_version} or patch"

    if include_user_input? result[:call]
      confidence = :high
    else
      confidence = :medium
    end

    warn :result => result,
      :warning_type => "Cross-Site Scripting",
      :warning_code => code,
      :message => message,
      :confidence => :high,
      :link_path => link
  end
end

#check_rails_html_sanitizer ⇒ Object 



64
65
66
67
68
69
70
71
72
73
74
75
 
# File 'lib/brakeman/checks/check_sanitize_methods.rb', line 64

def check_rails_html_sanitizer
  rhs_version = tracker.config.gem_version(:'rails-html-sanitizer')

  if version_between? "1.0.0", "1.0.2", rhs_version
    warn_sanitizer_cve "CVE-2015-7578", "https://groups.google.com/d/msg/rubyonrails-security/uh--W4TDwmI/JbvSRpdbFQAJ", "1.0.3"
    warn_sanitizer_cve "CVE-2015-7580", "https://groups.google.com/d/msg/rubyonrails-security/uh--W4TDwmI/m_CVZtdbFQAJ", "1.0.3"
  end

  if version_between? "1.0.0", "1.0.3", rhs_version
    warn_sanitizer_cve "CVE-2018-3741", "https://groups.google.com/d/msg/rubyonrails-security/tP7W3kLc5u4/uDy2Br7xBgAJ", "1.0.4"
  end
end

#loofah_vulnerable_cve_2018_8048? ⇒ Boolean

Returns:

  • (Boolean) 


96
97
98
99
100
 
# File 'lib/brakeman/checks/check_sanitize_methods.rb', line 96

def loofah_vulnerable_cve_2018_8048?
  loofah_version = tracker.config.gem_version(:loofah)

  loofah_version and loofah_version < "2.1.2"
end

#run_check ⇒ Object 



10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/brakeman/checks/check_sanitize_methods.rb', line 10

def run_check
  @fix_version = case
    when version_between?('2.0.0', '2.3.17')
      '2.3.18'
    when version_between?('3.0.0', '3.0.99')
      '3.2.13'
    when version_between?('3.1.0', '3.1.11')
      '3.1.12'
    when version_between?('3.2.0', '3.2.12')
      '3.2.13'
    end

  if @fix_version
    check_cve_2013_1855
    check_cve_2013_1857
  end

  if tracker.config.has_gem? :'rails-html-sanitizer'
    check_rails_html_sanitizer
  end

  check_cve_2018_8048
end

#warn_sanitizer_cve(cve, link, upgrade_version) ⇒ Object 



102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
 
# File 'lib/brakeman/checks/check_sanitize_methods.rb', line 102

def warn_sanitizer_cve cve, link, upgrade_version
  message = "rails-html-sanitizer #{tracker.config.gem_version(:'rails-html-sanitizer')} is vulnerable (#{cve}). Upgrade to #{upgrade_version}"

  if tracker.find_call(:target => false, :method => :sanitize).any?
    confidence = :high
  else
    confidence = :medium
  end

  warn :warning_type => "Cross-Site Scripting",
    :warning_code => cve.tr('-', '_').to_sym,
    :message => message,
    :gem_info => gemfile_or_environment,
    :confidence => confidence,
    :link_path => link
end