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50 lines
2.0 KiB
50 lines
2.0 KiB
// Copyright 2021 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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////////////////////////////////////////////////////////////////////////////////
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import com.code_intelligence.jazzer.api.FuzzedDataProvider;
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import com.code_intelligence.jazzer.api.FuzzerSecurityIssueHigh;
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import com.code_intelligence.jazzer.api.FuzzerSecurityIssueMedium;
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import com.google.json.JsonSanitizer;
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public class DenylistFuzzer {
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public static void fuzzerTestOneInput(FuzzedDataProvider data) {
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String input = data.consumeRemainingAsString();
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String output;
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try {
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output = JsonSanitizer.sanitize(input, 10);
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} catch (ArrayIndexOutOfBoundsException e) {
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// ArrayIndexOutOfBoundsException is expected if nesting depth is
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// exceeded.
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return;
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}
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// Check for forbidden substrings. As these would enable Cross-Site
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// Scripting, treat every finding as a high severity vulnerability.
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assert !output.contains("</script")
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: new FuzzerSecurityIssueHigh("Output contains </script");
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assert !output.contains("]]>")
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: new FuzzerSecurityIssueHigh("Output contains ]]>");
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// Check for more forbidden substrings. As these would not directly enable
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// Cross-Site Scripting in general, but may impact script execution on the
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// embedding page, treat each finding as a medium severity vulnerability.
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assert !output.contains("<script")
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: new FuzzerSecurityIssueMedium("Output contains <script");
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assert !output.contains("<!--")
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: new FuzzerSecurityIssueMedium("Output contains <!--");
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}
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}
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