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