CVE-2017-14251: Typo3/cms TYPO3 Arbitrary Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-fh4q-hxrw-cjqq
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CVSS 8.8
CWE-434
Published
Advisory Summary

CVE-2017-14251 is a HIGH (CVSS 8.8) typo3 arbitrary code execution vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Typo3/cms libraries in the Packagist ecosystem. The issue involves typo3 arbitrary code execution. Remediation is available by upgrading affected packages to version 7.6.22, 8.7.5.

CVE-2017-14251 at a Glance

CVE Identifier CVE-2017-14251
GHSA Identifier GHSA-fh4q-hxrw-cjqq
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Typo3/cms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.8

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

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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2017-14251

To remediate this vulnerability, upgrade all affected Typo3/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.

typo3/cms fixed: 7.6.22 
Upgrade typo3/cms to 7.6.22
typo3/cms fixed: 8.7.5 
Upgrade typo3/cms to 8.7.5
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 typo3/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2017-14251, inspect your project dependencies for Typo3/cms:

inspect dependencies for typo3/cms

Analyze the terminal output to locate any version of Typo3/cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 7.6.22), 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-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In Typo3/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

Unrestricted File Upload vulnerability in the fileDenyPattern in sysext/core/Classes/Core/SystemEnvironmentBuilder.php in TYPO3 7.6.0 to 7.6.21 and 8.0.0 to 8.7.4 allows remote authenticated users to upload files with a .pht extension and consequently execute arbitrary PHP code.

CVE-2017-14251 Affected Typo3/cms Versions

2 component(s)
Fixed Versions:
7.6.228.7.5
Product / Package Ecosystem Affected Versions Fixed Version
typo3/cms
 Packagist
≥ 7.6.0
< 7.6.22
7.6.22
typo3/cms
 Packagist
≥ 8.0.0
< 8.7.5
8.7.5

References

NVD — CVE-2017-14251 NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-14251
Typo3/cms Source Repository REPOSITORY
https://github.com/TYPO3/typo3
Typo3/cms Security Information SECURITY
https://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2017-007
blog.emaze.net/2017/12/typo3-unres... WEB
http://blog.emaze.net/2017/12/typo3-unrestricted-file-upload-remote.html
Typo3/cms Security Information SECURITY
http://www.securityfocus.com/bid/100620
Typo3/cms Security Information SECURITY
http://www.securitytracker.com/id/1039295

Frequently Asked Questions

What is CVE-2017-14251?
CVE-2017-14251 is a security vulnerability in Typo3/cms involving TYPO3 Arbitrary Code Execution under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Typo3/cms versions are affected?
Affected versions include releases prior to 7.6.22, 8.7.5 across affected packages: typo3/cms.
What version fixes CVE-2017-14251?
Upgrading to 7.6.22, 8.7.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is typo3/cms affected?
Yes, typo3/cms is affected in releases prior to 7.6.22, 8.7.5. Upgrade your dependency to 7.6.22, 8.7.5 or later.
What is the CVSS score of CVE-2017-14251?
CVE-2017-14251 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2017-14251?
CVE-2017-14251 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check Packagist dependencies for CVE-2017-14251?
Run the dependency tree command: 'inspect dependencies for typo3/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-fh4q-hxrw-cjqq",
  "modified" : "2024-04-25T21:29:47Z",
  "published" : "2022-05-17T00:18:39Z",
  "aliases" : [ "CVE-2017-14251" ],
  "summary" : "TYPO3 Arbitrary Code Execution",
  "details" : "Unrestricted File Upload vulnerability in the fileDenyPattern in sysext/core/Classes/Core/SystemEnvironmentBuilder.php in TYPO3 7.6.0 to 7.6.21 and 8.0.0 to 8.7.4 allows remote authenticated users to upload files with a .pht extension and consequently execute arbitrary PHP code.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.6.0"
      }, {
        "fixed" : "7.6.22"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.7.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-14251"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/TYPO3/typo3"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2017-007"
  }, {
    "type" : "WEB",
    "url" : "http://blog.emaze.net/2017/12/typo3-unrestricted-file-upload-remote.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.securityfocus.com/bid/100620"
  }, {
    "type" : "WEB",
    "url" : "http://www.securitytracker.com/id/1039295"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-25T21:29:47Z",
    "nvd_published_at" : "2017-09-11T09:29:00Z"
  }
}