Use "...".unpack("m0").first for Ruby < 2.4.0.

ronin-rb · Aug 16, 2024 · b7d952a · b7d952a
1 parent 8d666f4
commit b7d952a
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Showing 2 changed files with 5 additions and 5 deletions.
diff --git a/lib/ronin/payloads/encoders/builtin/ruby/base64_encode.rb b/lib/ronin/payloads/encoders/builtin/ruby/base64_encode.rb
@@ -43,10 +43,10 @@ class Base64Encode < RubyEncoder
 
           description <<~DESC
             Encodes the given Ruby code as a Base64 string, then decodes it
-            using `"...".unpack1('m0')`, and then evaluates the decoded Ruby
-            code using `eval()`.
+            using `"...".unpack('m0').first`, and then evaluates the decoded
+            Ruby code using `eval()`.
 
-              puts('PWNED') -> eval("cHV0cygnUFdORUQnKQ==".unpack1("m0"))
+              puts('PWNED') -> eval("cHV0cygnUFdORUQnKQ==".unpack("m0").first)
 
           DESC
 
@@ -61,7 +61,7 @@ class Base64Encode < RubyEncoder
           def encode(ruby)
             base64 = Support::Encoding::Base64.encode(ruby, mode: :strict)
 
-            %{eval("#{base64}".unpack1("m0"))}
+            %{eval("#{base64}".unpack("m0").first)}
           end
 
         end

diff --git a/spec/encoders/builtin/ruby/base64_encode_spec.rb b/spec/encoders/builtin/ruby/base64_encode_spec.rb
@@ -16,7 +16,7 @@
 
   describe "#encode" do
     let(:ruby)    { "puts('PWNED')" }
-    let(:encoded) { %{eval("cHV0cygnUFdORUQnKQ==".unpack1("m0"))} }
+    let(:encoded) { %{eval("cHV0cygnUFdORUQnKQ==".unpack("m0").first)} }
 
     it "must encode the given Ruby code as a Base64 string and embed it into the 'eval(\"...\".unpack1(\"m0\")' string" do
       expect(subject.encode(ruby)).to eq(encoded)