CVE-2018-18326: DotNetNuke.Core Insufficient Entropy Vulnerability

HIGH
Advisory Identifier: GHSA-xx3h-j3cx-8qfj
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CVSS 7.5
CWE-331
Published
Advisory Summary

CVE-2018-18326 is a HIGH (CVSS 7.5) insufficient entropy vulnerability (CWE-331: Insufficient Entropy) affecting DotNetNuke.Core libraries in the NuGet ecosystem. The issue involves insufficient entropy in dotnetnuke. Remediation is available by upgrading affected packages to version 9.3.0.

CVE-2018-18326 at a Glance

CVE Identifier CVE-2018-18326
GHSA Identifier GHSA-xx3h-j3cx-8qfj
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-331: Insufficient Entropy
Affected Product DotNetNuke.Core
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

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

How to Fix CVE-2018-18326

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

DotNetNuke.Core fixed: 9.3.0 
Upgrade DotNetNuke.Core to 9.3.0
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 DotNetNuke.Core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-18326, inspect your project dependencies for DotNetNuke.Core:

inspect dependencies for DotNetNuke.Core

Analyze the terminal output to locate any version of DotNetNuke.Core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.3.0), 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-331: Insufficient Entropy, where the product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others. In DotNetNuke.Core, 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

DNN (aka DotNetNuke) 9.2 through 9.2.2 incorrectly converts encryption key source values, resulting in lower than expected entropy. NOTE: this issue exists because of an incomplete fix for CVE-2018-15812.

CVE-2018-18326 Affected DotNetNuke.Core Versions

1 component(s)
Fixed Versions:
9.3.0
Product / Package Ecosystem Affected Versions Fixed Version
DotNetNuke.Core
nuget/DotNetNuke.Core
NuGet
< 9.3.0
9.3.0

References

NVD — CVE-2018-18326 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-18326
DotNetNuke.Core Source Repository REPOSITORY
https://github.com/dnnsoftware/Dnn.Platform/releases
DotNetNuke.Core Security Information SECURITY
https://www.dnnsoftware.com/community/security/security-center
DotNetNuke.Core Security Information SECURITY
http://packetstormsecurity.com/files/157080/DotNetNuke-Cookie-Deserialization-Remote-Code-Execution.html

Frequently Asked Questions

What is CVE-2018-18326?
CVE-2018-18326 is a security vulnerability in DotNetNuke.Core involving Insufficient Entropy in DotNetNuke under CWE-331: Insufficient Entropy.
Which DotNetNuke.Core versions are affected?
Affected versions include releases prior to 9.3.0 across affected packages: DotNetNuke.Core.
What version fixes CVE-2018-18326?
Upgrading to 9.3.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is DotNetNuke.Core affected?
Yes, DotNetNuke.Core is affected in releases prior to 9.3.0. Upgrade your dependency to 9.3.0 or later.
What is the CVSS score of CVE-2018-18326?
CVE-2018-18326 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2018-18326?
CVE-2018-18326 is classified under CWE-331: Insufficient Entropy (The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.).
How can I check NuGet dependencies for CVE-2018-18326?
Run the dependency tree command: 'inspect dependencies for DotNetNuke.Core'. 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-xx3h-j3cx-8qfj",
  "modified" : "2021-08-17T15:50:15Z",
  "published" : "2019-07-05T21:08:20Z",
  "aliases" : [ "CVE-2018-18326" ],
  "summary" : "Insufficient Entropy in DotNetNuke",
  "details" : "DNN (aka DotNetNuke) 9.2 through 9.2.2 incorrectly converts encryption key source values, resulting in lower than expected entropy. NOTE: this issue exists because of an incomplete fix for CVE-2018-15812.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "DotNetNuke.Core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "9.3.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-18326"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dnnsoftware/Dnn.Platform/releases"
  }, {
    "type" : "WEB",
    "url" : "https://www.dnnsoftware.com/community/security/security-center"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/157080/DotNetNuke-Cookie-Deserialization-Remote-Code-Execution.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-331" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-07-05T20:59:37Z",
    "nvd_published_at" : "2019-07-03T17:15:00Z"
  }
}