Advisory details:
github_osv / GHSA-5crp-9r3c-p9vr
| Advisory ID | github_osv/GHSA-5crp-9r3c-p9vr |
| Aliases |
CVE-2024-21907
|
| Summary | Improper Handling of Exceptional Conditions in Newtonsoft.Json Newtonsoft.Json prior to version 13.0.1 is vulnerable to Insecure Defaults due to improper handling of expressions with high nesting level that lead to StackOverFlow exception or high CPU and RAM usage. Exploiting this vulnerability results in Denial Of Service (DoS). The serialization and deserialization path have different properties regarding the issue. Deserializing methods (like `JsonConvert.DeserializeObject`) will process the input that results in burning the CPU, allocating memory, and consuming a thread of execution. Quite high nesting level (>10kk, or 9.5MB of `{a:{a:{...` input) is needed to achieve the latency over 10 seconds, depending on the hardware. Serializing methods (like `JsonConvert.Serialize` or `JObject.ToString`) will throw StackOverFlow exception with the nesting level of around 20k. To mitigate the issue one either need to update Newtonsoft.Json to 13.0.1 or set `MaxDepth` parameter in the `JsonSerializerSettings`. This can be done globally with the following statement. After that the parsing of the nested input will fail fast with `Newtonsoft.Json.JsonReaderException`: ``` JsonConvert.DefaultSettings = () => new JsonSerializerSettings { MaxDepth = 128 }; ``` Repro code: ``` //Create a string representation of an highly nested object (JSON serialized) int nRep = 25000; string json = string.Concat(Enumerable.Repeat("{a:", nRep)) + "1" + string.Concat(Enumerable.Repeat("}", nRep)); //Parse this object (leads to high CPU/RAM consumption) var parsedJson = JsonConvert.DeserializeObject(json); // Methods below all throw stack overflow with nRep around 20k and higher // string a = parsedJson.ToString(); // string b = JsonConvert.SerializeObject(parsedJson); ``` ### Additional affected product and version information **The original statement about the problem only affecting IIS applications is misleading.** Any application is affected, however the IIS has a behavior that stops restarting the instance after some time resulting in a harder-to-fix DoS.** |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.8 |
| Risk | 3.4 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 7.5 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/06/GHSA-5crp-9r3c-p9vr/GHSA-5crp-9r3c-p9vr.json |
| generic_textual | HIGH |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-21T19:31:50Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2024/21xxx/CVE-2024-21907.json
Source Advisory: vulnrichment/CVE-2024-21907
[{'Exploitation': 'poc'},
{'Automatable': 'yes'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-03-21T19:31:50Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2024/21xxx/CVE-2024-21907.json
Source Advisory: vulnrichment/CVE-2024-21907
[{'Exploitation': 'poc'},
{'Automatable': 'yes'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]