PT-2026-58960 · Packagist · Nukeviet/Nukeviet

Published

2026-07-13

·

Updated

2026-07-13

CVSS v3.1

8.7

High

VectorAV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H

Summary

Path Traversal to Arbitrary File Deletion in the Edit Comment admin function. An authenticated administrator can delete arbitrary files within the application root (e.g., config.php) by injecting a crafted attach parameter, rendering the application inoperable.

Affected Component

modules/comment/admin/edit.php

Root Cause

In the vulnerable version, the attach parameter received via HTTP POST was not validated before being processed:
php
// Vulnerable code (before fix)
$attach = $nv Request->get string('attach', 'post', '', true);
if (!empty($attach)) {
  $attach = substr($attach, strlen(NV BASE SITEURL . NV UPLOADS DIR . '/' . $module upload . '/'));
}
substr() strips the first N characters (equal to the length of the upload URL prefix, e.g. 26 chars for /nukeviet/uploads/comment/). By padding the payload with exactly 26 arbitrary characters followed by a path traversal sequence, an attacker can store ../../<target> directly into the database.
When the comment is subsequently deleted, del.php reads attach from the database and calls:
php
nv deletefile(NV UPLOADS REAL DIR . '/' . $module upload . '/' . $row['attach']);
nv deletefile() resolves the path via realpath() and only verifies the result is within NV ROOTDIR — it does not restrict deletion to the uploads directory — allowing deletion of any file in the installation root.

Steps to Reproduce

  1. Log in as an administrator and navigate to Admin → Comment Management.
  2. Select any comment and open the Edit form.
  3. Intercept the POST request and set the attach parameter to:
aaaaaaaaaaaaaaaaaaaaaaaaaa../../config.php
(26 padding characters + traversal path)
  1. Submit the request. The value ../../config.php is now stored in the database.
  2. Delete the comment. config.php is deleted from the application root.
  3. The application immediately redirects to the install wizard, confirming the file has been removed.

Impact

  • Any file readable by the web server process within NV ROOTDIR can be permanently deleted.
  • Deleting config.php causes a full application outage and exposes the install wizard.

Severity

CVSS v3.1 Base Score: 8.7 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H
MetricValue
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh (Admin required)
User InteractionNone
ScopeChanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh

Fix

Added nv is file() validation before processing the attach value. This function uses realpath() and a regex check to ensure the file resolves to a path within the intended upload directory, rejecting any traversal attempts.
php
// Fixed code
$attach = $nv Request->get string('attach', 'post', '');
if (!empty($attach) and nv is file($attach, NV UPLOADS DIR . '/' . $module upload)) {
  $attach = substr($attach, strlen(NV BASE SITEURL . NV UPLOADS DIR . '/' . $module upload . '/'));
} else {
  $attach = '';
}

Fix

Path traversal

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Weakness Enumeration

CWE-22

Related Identifiers

GHSA-C9XG-64P9-F2JJ

Affected Products

Nukeviet/Nukeviet