CVE-2023-49273: Umbraco.CMS Privilege Escalation Using Spoofing Vulnerability

MODERATE
Advisory Identifier: GHSA-cfr5-7p54-4qg8
Share
CVSS 5.4
CWE-863
Published
Advisory Summary

CVE-2023-49273 is a MODERATE (CVSS 5.4) privilege escalation using spoofing vulnerability (CWE-863: Incorrect Authorization) affecting Umbraco.CMS libraries in the NuGet ecosystem. The issue involves privilege escalation using spoofing. Remediation is available by upgrading affected packages to version 8.18.10, 10.8.1, 12.3.4.

CVE-2023-49273 at a Glance

CVE Identifier CVE-2023-49273
GHSA Identifier GHSA-cfr5-7p54-4qg8
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-863: Incorrect Authorization
Affected Product Umbraco.CMS
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).

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

How to Fix CVE-2023-49273

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

Umbraco.CMS fixed: 8.18.10 
Upgrade Umbraco.CMS to 8.18.10
Umbraco.CMS fixed: 10.8.1 
Upgrade Umbraco.CMS to 10.8.1
Umbraco.CMS fixed: 12.3.4 
Upgrade Umbraco.CMS to 12.3.4
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 Umbraco.CMS

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-49273, inspect your project dependencies for Umbraco.CMS:

inspect dependencies for Umbraco.CMS

Analyze the terminal output to locate any version of Umbraco.CMS in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.18.10), 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-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Umbraco.CMS, 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

#### Impact Users with low privileges ( Editor, etc) are able to access some unintended endpoints. #### Explanation of the vulnerability Possible to delete redirect urls, when disabled by admin with only access to backoffice Possible to access the examine dashboard with only access to backoffice Possible to access the published cache dashboard with only access to backoffice Possible to access the telemetry dashboard with only access to backoffice Possible to access the languages with only access to backoffice Possible to access the stylesheets with only access to backoffice

CVE-2023-49273 Affected Umbraco.CMS Versions

3 component(s)
Fixed Versions:
8.18.1010.8.112.3.4
Product / Package Ecosystem Affected Versions Fixed Version
Umbraco.CMS
nuget/Umbraco.CMS
NuGet
≥ 8.0.0
< 8.18.10
8.18.10
Umbraco.CMS
nuget/Umbraco.CMS
NuGet
≥ 9.0.0
< 10.8.1
10.8.1
Umbraco.CMS
nuget/Umbraco.CMS
NuGet
≥ 11.0.0
< 12.3.4
12.3.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-cfr5-7p54-4qg8
NVD — CVE-2023-49273 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-49273
Umbraco.CMS Source Repository REPOSITORY
https://github.com/umbraco/Umbraco-CMS

Frequently Asked Questions

What is CVE-2023-49273?
CVE-2023-49273 is a security vulnerability in Umbraco.CMS involving Privilege Escalation using Spoofing under CWE-863: Incorrect Authorization.
Which Umbraco.CMS versions are affected?
Affected versions include releases prior to 8.18.10, 10.8.1, 12.3.4 across affected packages: Umbraco.CMS.
What version fixes CVE-2023-49273?
Upgrading to 8.18.10, 10.8.1, 12.3.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Umbraco.CMS affected?
Yes, Umbraco.CMS is affected in releases prior to 8.18.10, 10.8.1, 12.3.4. Upgrade your dependency to 8.18.10, 10.8.1, 12.3.4 or later.
What is the CVSS score of CVE-2023-49273?
CVE-2023-49273 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2023-49273?
CVE-2023-49273 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check NuGet dependencies for CVE-2023-49273?
Run the dependency tree command: 'inspect dependencies for Umbraco.CMS'. 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-cfr5-7p54-4qg8",
  "modified" : "2024-01-12T16:29:13Z",
  "published" : "2023-12-13T13:25:38Z",
  "aliases" : [ "CVE-2023-49273" ],
  "summary" : "Privilege Escalation using Spoofing",
  "details" : "#### Impact\nUsers with low privileges ( Editor, etc) are able to access some unintended endpoints.\n\n#### Explanation of the vulnerability \nPossible to delete redirect urls, when disabled by admin with only access to backoffice\nPossible to access the examine dashboard with only access to backoffice\nPossible to access the published cache dashboard with only access to backoffice\nPossible to access the telemetry dashboard with only access to backoffice\nPossible to access the languages with only access to backoffice\nPossible to access the stylesheets with only access to backoffice",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.CMS"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.18.10"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.CMS"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "10.8.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Umbraco.CMS"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0"
      }, {
        "fixed" : "12.3.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-cfr5-7p54-4qg8"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-49273"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/umbraco/Umbraco-CMS"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-12-13T13:25:38Z",
    "nvd_published_at" : "2023-12-12T19:15:08Z"
  }
}