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[CVE-2023-39527] Possible XSS injection through Validate::isCleanHTML method
ValidateCore::isCleanHTML() method of Prestashop misses hijickable events which can lead to XSS injection, allowed by the presence of pre-setup @Keyframes methods.
Summary
- CVE ID: CVE-2023-39527
- Published at: 2023-08-07
- Advisory source: PrestaShop
- Platform: PrestaShop
- Product: PrestaShop
- Impacted release: >= 8.0.0 < 8.0.5 and < 1.7.8.10 (Patched versions 8.1.1, 8.0.5 and 1.7.8.10)
- Weakness: CWE-79
- Severity: high (8.3)
Description
This XSS which hijacks HTML attributes will be triggered without any interaction of the visitor/administrator which makes it as dangerous as a trivial XSS.
Contrary to most XSS which target HTML attributes and which are triggered without user interaction (such as onload / onerror which suffer from a very limited scope), this one can hijack every HTML element, which increases the danger due to a complete HTML elements scope.
CVSS base metrics
- Attack vector: network
- Attack complexity: low
- Privilege required: high
- User interaction: required
- Scope: changed
- Confidentiality: low
- Integrity: high
- Availability: high
Vector string: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:H/A:H
Possible malicious usage
- Unlock design’s vulnerability, see this also
Patch
--- a/classes/Validate.php
+++ b/classes/Validate.php
@@ -521,6 +521,7 @@ public static function isCleanHtml($html, $allow_iframe = false)
$events .= '|ondragleave|ondragover|ondragstart|ondrop|onerrorupdate|onfilterchange|onfinish|onfocusin|onfocusout|onhashchange|onhelp|oninput|onlosecapture|onmessage|onmouseup|onmovestart';
$events .= '|onoffline|ononline|onpaste|onpropertychange|onreadystatechange|onresizeend|onresizestart|onrowenter|onrowexit|onrowsdelete|onrowsinserted|onscroll|onsearch|onselectionchange';
$events .= '|onselectstart|onstart|onstop|onanimationcancel|onanimationend|onanimationiteration|onanimationstart';
+ $events .= '|onpointerover|onpointerenter|onpointerdown|onpointermove|onpointerup|onpointerout|onpointerleave|onpointercancel|ongotpointercapture|onlostpointercapture';
if (preg_match('/<[\s]*script/ims', $html) || preg_match('/(' . $events . ')[\s]*=/ims', $html) || preg_match('/.*script\:/ims', $html)) {
return false;
Other recommendations
- It’s recommended to upgrade to the latest version of the PrestaShop.
- Configure CSP rules especially for your backoffice.
Links
DISCLAIMER: The French Association Friends Of Presta (FOP) acts as an intermediary to help hosting this advisory. While we strive to ensure the information and advice provided are accurate, FOP cannot be held liable for any consequences arising from reported vulnerabilities or any subsequent actions taken.
This advisory and patch is licensed under CC BY-SA 4.0
