CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
27.8%
Advisory ID: usd-2024-0009 Product: Cookiebar Affected Version: 2.X Vulnerability Type: CWE-79: Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’) Security Risk: HIGH, CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N Vendor URL: https://www.usd.de/ Vendor acknowledged vulnerability: Yes Vendor Status: Fixed CVE Number: Not requested yet CVE Link: Not requested yet First Published: Published Last Update: 2024-07-29
The block
function in CookiebarController.php
.
Oveleon’s Cookiebar is an extension for the popular Contao CMS.
The block/locale
endpoint does not properly sanitize the user-controlled locale
input before including it in the backend’s HTTP response, thereby causing reflected XSS.
The vulnerability could be triggered by entering the following Link:
https://[redacted].de/cookiebar/block/dens82w%22%3E%3Cimg%20src%3da%20onerror%3dalert(1)%3Ew9qt
n/[id]?redirect=https%3A%2F%2F[...]amp%3Biv_load_policy%3D3%26amp%3Bmo
destbranding%3D1%26amp%3Brel%3D0
It is likely related to the following function in the Oveleon Cookiebar source code:
/**
* Block content
*
* @Route("/cookiebar/block/{locale}/{id}", name="cookiebar_block")
*/
public function block(Request $request, string $locale, int $id): Response
{
System::loadLanguageFile('tl_cookiebar', $locale);
$this->framework->initialize();
$objCookie = CookieModel::findById($id);
if (null === $objCookie || null === $request->headers->get('referer'))
{
throw new PageNotFoundException();
}
$strUrl = $request->get('redirect');
// Protect against XSS attacks
if(!Validator::isUrl($strUrl))
{
return new Response('The redirect destination must be a valid URL.', Response::HTTP_BAD_REQUEST);
}
$objTemplate = new FrontendTemplate($objCookie->blockTemplate ?: 'ccb_element_blocker');
$objTemplate->language = $locale;
$objTemplate->id = $objCookie->id;
$objTemplate->title = $objCookie->title;
$objTemplate->type = $objCookie->type;
$objTemplate->iframeType = $objCookie->iframeType;
$objTemplate->description = $objCookie->blockDescription;
$objTemplate->redirect = $request->get('redirect');
$objTemplate->acceptAndDisplayLabel = $this->translator->trans('tl_cookiebar.acceptAndDisplayLabel', [], 'contao_default', $locale);
return $objTemplate->getResponse();
}
Sanitize the locale
input to prevent XSS payloads from being executed in a user’s browser.
This security vulnerability was identified by DR of usd AG.
In order to protect businesses against hackers and criminals, we always have to keep our skills and knowledge up to date. Thus, security research is just as important for our work as is building up a security community to promote the exchange of knowledge. After all, more security can only be achieved if many individuals take on the task.
Our CST Academy and our usd HeroLab are essential parts of our security mission. We share the knowledge we gain in our practical work and our research through training courses and publications. In this context, the usd HeroLab publishes a series of papers on new vulnerabilities and current security issues.
Always for the sake of our mission: “more security.”
The information provided in this security advisory is provided “as is” and without warranty of any kind. Details of this security advisory may be updated in order to provide as accurate information as possible.
cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html
github.com/oveleon/contao-cookiebar
github.com/oveleon/contao-cookiebar/blob/2.x/src/Controller/CookiebarController.php
github.com/oveleon/contao-cookiebar/commit/1d57470be5878f66d5e1e23f624dd387564b9b8d
github.com/oveleon/contao-cookiebar/security/advisories/GHSA-296q-rj83-g9rq
nvd.nist.gov/vuln/detail/CVE-2024-47069
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
27.8%