CVE-2023-6551: Verot/class.upload.php Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-v6f4-jwv9-682w
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CVSS 6.5
CWE-20 CWE-434
Published
Advisory Summary

CVE-2023-6551 is a MODERATE (CVSS 6.5) cross-site scripting vulnerability (CWE-20: Improper Input Validation) affecting Verot/class.upload.php libraries in the Packagist ecosystem. The issue involves class.upload.php allows cross-site scripting attacks via uploaded files. Remediation is available in the latest vendor maintenance releases.

CVE-2023-6551 at a Glance

CVE Identifier CVE-2023-6551
GHSA Identifier GHSA-v6f4-jwv9-682w
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Verot/class.upload.php
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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 Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2023-6551

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

verot/class.upload.php fixed: Latest secure release 
Upgrade verot/class.upload.php to Latest secure release
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 verot/class.upload.php

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-6551, inspect your project dependencies for Verot/class.upload.php:

inspect dependencies for verot/class.upload.php

Analyze the terminal output to locate any version of Verot/class.upload.php in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Verot/class.upload.php, 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

As a simple library, class.upload.php does not perform an in-depth check on uploaded files, allowing a stored XSS vulnerability when the default configuration is used. Developers must be aware of that fact and use extension whitelisting accompanied by forcing the server to always provide content-type based on the file extension. The README has been updated to include these guidelines.

CVE-2023-6551 Affected Verot/class.upload.php Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
verot/class.upload.php
 Packagist
≤ 2.1.6

References

NVD — CVE-2023-6551 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-6551
Security Fix Commit FIX COMMIT
https://github.com/verot/class.upload.php/commit/befbccc2330b0ccb148fc87495896bd7b57f8c57
cert.pl/en/posts/2024/01/cv... WEB
https://cert.pl/en/posts/2024/01/CVE-2023-6551
cert.pl/posts/2024/01/cve-2... WEB
https://cert.pl/posts/2024/01/CVE-2023-6551
Verot/class.upload.php Source Repository REPOSITORY
https://github.com/verot/class.upload.php

Frequently Asked Questions

What is CVE-2023-6551?
CVE-2023-6551 is a security vulnerability in Verot/class.upload.php involving class.upload.php allows cross-site scripting attacks via uploaded files under CWE-20: Improper Input Validation.
Which Verot/class.upload.php versions are affected?
Affected versions include releases prior to current release patches across affected packages: verot/class.upload.php.
What version fixes CVE-2023-6551?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is verot/class.upload.php affected?
Yes, verot/class.upload.php is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2023-6551?
CVE-2023-6551 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2023-6551?
CVE-2023-6551 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Packagist dependencies for CVE-2023-6551?
Run the dependency tree command: 'inspect dependencies for verot/class.upload.php'. 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-v6f4-jwv9-682w",
  "modified" : "2024-01-04T20:10:32Z",
  "published" : "2024-01-04T18:30:21Z",
  "aliases" : [ "CVE-2023-6551" ],
  "summary" : "class.upload.php allows cross-site scripting attacks via uploaded files",
  "details" : "As a simple library, class.upload.php does not perform an in-depth check on uploaded files, allowing a stored XSS vulnerability when the default configuration is used. \n\n\nDevelopers must be aware of that fact and use extension whitelisting accompanied by forcing the server to always provide content-type based on the file extension. \n\n\nThe README has been updated to include these guidelines.\n\n\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "verot/class.upload.php"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.1.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-6551"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/verot/class.upload.php/commit/befbccc2330b0ccb148fc87495896bd7b57f8c57"
  }, {
    "type" : "WEB",
    "url" : "https://cert.pl/en/posts/2024/01/CVE-2023-6551"
  }, {
    "type" : "WEB",
    "url" : "https://cert.pl/posts/2024/01/CVE-2023-6551"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/verot/class.upload.php"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-434" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-04T20:10:32Z",
    "nvd_published_at" : "2024-01-04T16:15:09Z"
  }
}