Module: PWN::SAST::Base64

Defined in:
lib/pwn/sast/base64.rb

Overview

SAST Module used to identify Base64 encoded strings that may have sensitive artifacts when decoded.

Constant Summary collapse

@@logger = 
PWN::Plugins::PWNLogger.create

Class Method Summary collapse

Class Method Details

.authors ⇒ Object

Author(s)

0day Inc. <[email protected]>



123
124
125
126
127
 
# File 'lib/pwn/sast/base64.rb', line 123

public_class_method def self.authors
  "AUTHOR(S):
    0day Inc. <[email protected]>
  "
end

.help ⇒ Object

Display Usage for this Module



131
132
133
134
135
136
137
138
139
140
 
# File 'lib/pwn/sast/base64.rb', line 131

public_class_method def self.help
  puts "USAGE:
    sast_arr = #{self}.scan(
      dir_path: 'optional path to dir defaults to .',
      git_repo_root_uri: 'optional http uri of git repo scanned'
    )

    #{self}.authors
  "
end

.nist_800_53_requirements ⇒ Object

Used primarily to map NIST 800-53 Revision 4 Security Controls web.nvd.nist.gov/view/800-53/Rev4/impact?impactName=HIGH to PWN Exploit & Static Code Anti-Pattern Matching Modules to Determine the level of Testing Coverage w/ PWN.



111
112
113
114
115
116
117
118
119
 
# File 'lib/pwn/sast/base64.rb', line 111

public_class_method def self.nist_800_53_requirements
  {
    sast_module: self,
    section: 'PROTECTION OF INFORMATION AT REST',
    nist_800_53_uri: 'https://csrc.nist.gov/Projects/risk-management/sp800-53-controls/release-search#/control/?version=5.1&number=SC-28'
  }
rescue StandardError => e
  raise e
end

.scan(opts = {}) ⇒ Object

Supported Method Parameters

PWN::SAST::Eval.scan(

dir_path: 'optional path to dir defaults to .'
git_repo_root_uri: 'optional http uri of git repo scanned'

)



18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
 
# File 'lib/pwn/sast/base64.rb', line 18

public_class_method def self.scan(opts = {})
  dir_path = opts[:dir_path]
  git_repo_root_uri = opts[:git_repo_root_uri].to_s.scrub
  result_arr = []
  logger_results = ''

  PWN::Plugins::FileFu.recurse_dir(dir_path: dir_path) do |entry|
    if File.file?(entry) && File.basename(entry) !~ /^pwn.+(html|json|db)$/ && File.basename(entry) !~ /\.JS-BEAUTIFIED$/
      line_no_and_contents_arr = []
      filename_arr = []
      entry_beautified = false

      if File.extname(entry) == '.js' && (`wc -l #{entry}`.split.first.to_i < 20 || entry.include?('.min.js') || entry.include?('-all.js'))
        js_beautify = `js-beautify #{entry} > #{entry}.JS-BEAUTIFIED`.to_s.scrub
        entry = "#{entry}.JS-BEAUTIFIED"
        entry_beautified = true
      end

      # TODO: Include regex to search for Base64 strings
      test_case_filter = "
        grep -En \
        -e 'base64' \
        -e 'Base64' \
        -e 'BASE64' #{entry}
      "

      str = `#{test_case_filter}`.to_s.scrub

      if str.to_s.empty?
        # If str length is >= 64 KB do not include results. (Due to Mongo Document Size Restrictions)
        logger_results = "#{logger_results}~" # Catching bugs is good :)
      else
        str = "1:Result larger than 64KB -> Size: #{str.to_s.length}.  Please click the \"Path\" link for more details." if str.to_s.length >= 64_000

        hash_line = {
          timestamp: Time.now.strftime('%Y-%m-%d %H:%M:%S.%9N %z').to_s,
          test_case: nist_800_53_requirements,
          filename: filename_arr.push(git_repo_root_uri: git_repo_root_uri, entry: entry),
          line_no_and_contents: '',
          raw_content: str,
          test_case_filter: test_case_filter
        }

        # COMMMENT: Must be a better way to implement this (regex is kinda funky)
        line_contents_split = str.split(/^(\d{1,}):|\n(\d{1,}):/)[1..-1]
        line_no_count = line_contents_split.length # This should always be an even number
        current_count = 0
        while line_no_count > current_count
          line_no = line_contents_split[current_count]
          contents = line_contents_split[current_count + 1]
          if Dir.exist?("#{dir_path}/.git") ||
             Dir.exist?('.git')

            repo_root = dir_path
            repo_root = '.' if Dir.exist?('.git')

            author = PWN::Plugins::Git.get_author(
              repo_root: repo_root,
              from_line: line_no,
              to_line: line_no,
              target_file: entry,
              entry_beautified: entry_beautified
            )
          else
            author = 'N/A'
          end
          hash_line[:line_no_and_contents] = line_no_and_contents_arr.push(line_no: line_no,
                                                                           contents: contents,
                                                                           author: author)

          current_count += 2
        end
        result_arr.push(hash_line)
        logger_results = "#{logger_results}x" # Seeing progress is good :)
      end
    end
  end
  logger_banner = "http://#{Socket.gethostname}:8808/doc_root/pwn-#{PWN::VERSION.to_s.scrub}/#{to_s.scrub.gsub('::', '/')}.html"
  if logger_results.empty?
    @@logger.info("#{logger_banner}: No files applicable to this test case.\n")
  else
    @@logger.info("#{logger_banner} => #{logger_results}complete.\n")
  end
  result_arr
rescue StandardError => e
  raise e
end