CVE-2018-1000210: YamlDotNet High Severity Vulnerability That Affects Vulnerability

HIGH
Advisory Identifier: GHSA-rpch-cqj9-h65r
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CVSS 7.8
CWE-639 CWE-502
Published
Advisory Summary

CVE-2018-1000210 is a HIGH (CVSS 7.8) high severity vulnerability that affects vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting YamlDotNet libraries in the NuGet ecosystem. The issue involves high severity vulnerability that affects yamldotnet and yamldotnet.signed. Remediation is available by upgrading affected packages to version 5.0.0.

CVE-2018-1000210 at a Glance

CVE Identifier CVE-2018-1000210
GHSA Identifier GHSA-rpch-cqj9-h65r
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-639: Authorization Bypass Through User-Controlled Key
Affected Product YamlDotNet
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 7.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2018-1000210

To remediate this vulnerability, upgrade all affected YamlDotNet dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

YamlDotNet fixed: 5.0.0 
Upgrade YamlDotNet to 5.0.0
YamlDotNet.Signed fixed: 5.0.0 
Upgrade YamlDotNet.Signed to 5.0.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for YamlDotNet

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-1000210, inspect your project dependencies for YamlDotNet:

inspect dependencies for YamlDotNet

Analyze the terminal output to locate any version of YamlDotNet in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.0.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In YamlDotNet, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

YamlDotNet version 4.3.2 and earlier contains a Insecure Direct Object Reference vulnerability in The default behavior of Deserializer.Deserialize() will deserialize user-controlled types in the line "currentType = Type.GetType(nodeEvent.Tag.Substring(1), throwOnError: false);" and blindly instantiates them. that can result in Code execution in the context of the running process. This attack appear to be exploitable via Victim must parse a specially-crafted YAML file. This vulnerability appears to have been fixed in 5.0.0.

CVE-2018-1000210 Affected YamlDotNet Versions

2 component(s)
Fixed Versions:
5.0.0
Product / Package Ecosystem Affected Versions Fixed Version
YamlDotNet
nuget/YamlDotNet
NuGet
< 5.0.0
5.0.0
YamlDotNet.Signed
nuget/YamlDotNet.Signed
NuGet
< 5.0.0
5.0.0

References

NVD — CVE-2018-1000210 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1000210
YamlDotNet Source Repository REPOSITORY
https://github.com/aaubry/YamlDotNet#version-500
YamlDotNet Source Repository REPOSITORY
https://github.com/aaubry/YamlDotNet/blob/f96b7cc40a0498f8bafdeb49df3aa23aa2c60993/YamlDotNet/Serialization/NodeTypeResolvers/TypeNameInTagNodeTypeResolver.cs#L35
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-rpch-cqj9-h65r
YamlDotNet Source Repository REPOSITORY
ps://github.com/aaubry/YamlDotNet

Frequently Asked Questions

What is CVE-2018-1000210?
CVE-2018-1000210 is a security vulnerability in YamlDotNet involving High severity vulnerability that affects YamlDotNet and YamlDotNet.Signed under CWE-639: Authorization Bypass Through User-Controlled Key.
Which YamlDotNet versions are affected?
Affected versions include releases prior to 5.0.0 across affected packages: YamlDotNet, YamlDotNet.Signed.
What version fixes CVE-2018-1000210?
Upgrading to 5.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is YamlDotNet affected?
Yes, YamlDotNet is affected in releases prior to 5.0.0. Upgrade your dependency to 5.0.0 or later.
Is YamlDotNet.Signed affected?
Yes, YamlDotNet.Signed is affected in releases prior to 5.0.0. Upgrade your dependency to 5.0.0 or later.
What is the CVSS score of CVE-2018-1000210?
CVE-2018-1000210 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2018-1000210?
CVE-2018-1000210 is classified under CWE-639: Authorization Bypass Through User-Controlled Key (The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.).
How can I check NuGet dependencies for CVE-2018-1000210?
Run the dependency tree command: 'inspect dependencies for YamlDotNet'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rpch-cqj9-h65r",
  "modified" : "2021-09-17T19:23:01Z",
  "published" : "2018-10-16T17:01:10Z",
  "aliases" : [ "CVE-2018-1000210" ],
  "summary" : "High severity vulnerability that affects YamlDotNet and YamlDotNet.Signed",
  "details" : "YamlDotNet version 4.3.2 and earlier contains a Insecure Direct Object Reference vulnerability in The default behavior of Deserializer.Deserialize() will deserialize user-controlled types in the line \"currentType = Type.GetType(nodeEvent.Tag.Substring(1), throwOnError: false);\" and blindly instantiates them. that can result in Code execution in the context of the running process. This attack appear to be exploitable via Victim must parse a specially-crafted YAML file. This vulnerability appears to have been fixed in 5.0.0.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "YamlDotNet"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.0.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.3.2"
    }
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "YamlDotNet.Signed"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.0.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.3.2"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1000210"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aaubry/YamlDotNet#version-500"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/aaubry/YamlDotNet/blob/f96b7cc40a0498f8bafdeb49df3aa23aa2c60993/YamlDotNet/Serialization/NodeTypeResolvers/TypeNameInTagNodeTypeResolver.cs#L35"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-rpch-cqj9-h65r"
  }, {
    "type" : "PACKAGE",
    "url" : "ps://github.com/aaubry/YamlDotNet"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502", "CWE-639" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:55:19Z",
    "nvd_published_at" : null
  }
}