CVE-2023-49089: Umbraco.CMS Using The Directory Back Payload Vulnerability

Q: What is CVE-2023-49089?

CVE-2023-49089 is a security vulnerability in Umbraco.CMS involving Using the directory back payload (“/../”) in a package name allows placement of package in other folders. under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').

Q: 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.

Q: What version fixes CVE-2023-49089?

Upgrading to 8.18.10, 10.8.1, 12.3.4 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: 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.

Q: What is the CVSS score of CVE-2023-49089?

CVE-2023-49089 has a CVSS v3.1 base score of 0.0 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:N.

Q: What CWE is associated with CVE-2023-49089?

CVE-2023-49089 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).

Q: How can I check NuGet dependencies for CVE-2023-49089?

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.

LOW

Advisory Identifier: GHSA-6324-52pr-h4p5

CVSS 0.0

CWE-22

Published 2023-12-13

Advisory Summary

CVE-2023-49089 is a LOW (CVSS 0.0) using the directory back payload vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Umbraco.CMS libraries in the NuGet ecosystem. The issue involves using the directory back payload (“/../”) in a package name allows placement of package in other folders.. Remediation is available by upgrading affected packages to version 8.18.10, 10.8.1, 12.3.4.

CVE-2023-49089 at a Glance

CVE Identifier CVE-2023-49089

GHSA Identifier GHSA-6324-52pr-h4p5

Severity LOW

CVSS v3.1 Base Score 0.0

CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected Product Umbraco.CMS

Package Ecosystem NuGet

Published Date 2023-12-13

Last Updated 2024-01-12

Security Impact

CVSS: 0.0

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:C/C:N/I:N/A:N).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction None (UI:N)

Scope Changed (S:C)

Confidentiality None (C:N)

Integrity None (I:N)

Availability None (A:N)

How to Fix CVE-2023-49089

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-2023-49089, 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. 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 Backoffice users with permissions to create packages can use path traversal and thereby write outside of the expected location. #### Explanation of the vulnerability The “Package” section in Umbraco Backoffice allows a logged in user to write folders outside of the default package directory.

CVE-2023-49089 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-6324-52pr-h4p5

NVD — CVE-2023-49089 NVD

https://nvd.nist.gov/vuln/detail/CVE-2023-49089

Umbraco.CMS Source Repository REPOSITORY

https://github.com/umbraco/Umbraco-CMS

Frequently Asked Questions

What is CVE-2023-49089?

CVE-2023-49089 is a security vulnerability in Umbraco.CMS involving Using the directory back payload (“/../”) in a package name allows placement of package in other folders. under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').

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-2023-49089?

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-2023-49089?

CVE-2023-49089 has a CVSS v3.1 base score of 0.0 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:N.

What CWE is associated with CVE-2023-49089?

CVE-2023-49089 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).

How can I check NuGet dependencies for CVE-2023-49089?

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-6324-52pr-h4p5",
  "modified" : "2024-01-12T16:28:06Z",
  "published" : "2023-12-13T13:24:53Z",
  "aliases" : [ "CVE-2023-49089" ],
  "summary" : "Using the directory back payload (“/../”) in a package name allows placement of package in other folders.",
  "details" : "#### Impact\nBackoffice users with permissions to create packages can use path traversal and thereby write outside of the expected location.\n\n#### Explanation of the vulnerability \nThe “Package” section in Umbraco Backoffice allows a logged in user to write folders outside of the default package directory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/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-6324-52pr-h4p5"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-49089"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/umbraco/Umbraco-CMS"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-12-13T13:24:53Z",
    "nvd_published_at" : "2023-12-12T19:15:07Z"
  }
}

CVSS V3

0.0 LOW