Tcexam Cross-site Scripting

A reflected cross-site scripting vulnerability exists in TCExam <= 14.8.3. The paths provided in the f, d, and dir parameters in tce_filemanager.php were not properly validated and could cause reflected XSS via the unsanitized output of the path supplied. An attacker could craft a malicious link which, if triggered by an administrator, could result in the attacker hijacking the victim's session or performing actions on their behalf. (2021-08-05, CVE-2021-20115)

A reflected cross-site scripting vulnerability exists in TCExam <= 14.8.4. The paths provided in the f, d, and dir parameters in tce_select_mediafile.php were not properly validated and could cause reflected XSS via the unsanitized output of the path supplied. An attacker could craft a malicious link which, if triggered by an administrator, could result in the attacker hijacking the victim's session or performing actions on their behalf. (2021-08-05, CVE-2021-20116)

A stored cross-site scripting vulnerability exists in TCExam <= 14.8.1. Valid files uploaded via tce_filemanager.php with a filename beggining with a period will be rendered as text/html. An attacker with access to tce_filemanager.php could upload a malicious javascript payload which would be triggered when another user views the file. (2021-07-30, CVE-2021-20111)

A stored cross-site scripting vulnerability exists in TCExam <= 14.8.1. Valid files uploaded via tce_select_mediafile.php with a filename beggining with a period will be rendered as text/html. An attacker with access to tce_select_mediafile.php could upload a malicious javascript payload which would be triggered when another user views the file. (2021-07-30, CVE-2021-20112)

Insufficient output sanitization in TCExam 14.2.2 allows a remote, authenticated attacker to conduct persistent cross-site scripting (XSS) attacks by creating a crafted group. (2020-05-07, CVE-2020-5749)

Insufficient output sanitization in TCExam 14.2.2 allows a remote, authenticated attacker to conduct persistent cross-site scripting (XSS) attacks by creating a crafted operator. (2020-05-07, CVE-2020-5751)

Insufficient output sanitization in TCExam 14.2.2 allows a remote, authenticated attacker to conduct persistent cross-site scripting (XSS) attacks by creating a crafted test. (2020-05-07, CVE-2020-5746)

Insufficient output sanitization in TCExam 14.2.2 allows a remote, authenticated attacker to conduct persistent cross-site scripting (XSS) attacks by creating a crafted test. (2020-05-07, CVE-2020-5747)

Insufficient output sanitization in TCExam 14.2.2 allows a remote, unauthenticated attacker to conduct persistent cross-site scripting (XSS) attacks via the self-registration feature. (2020-05-07, CVE-2020-5748)

Insufficient output sanitization in TCExam 14.2.2 allows a remote, unauthenticated attacker to conduct persistent cross-site scripting (XSS) attacks via the self-registration feature. (2020-05-07, CVE-2020-5750)

TCExam before 14.1.2 has XSS via an ff_ or xl_ field. (2018-07-07, CVE-2018-13422)

Cross site scripting is an attack where a web page executes code that is injected by an adversary. It usually appears, when users input is presented. This attack can be used to impersonate a user, take over control of the session, or even steal API keys.

The attack can be executed e.g. when you application injects the request parameter directly into the HTML code of the page returned to the user:

https://server.com/confirmation?message=Transaction+Complete

what results in:

<span>Confirmation: Transaction Complete</span>

In that case the message can be modified to become a valid Javascript code, e.g.:

https://server.com/confirmation?message=<script>dangerous javascript code here</script>

and it will be executed locally by the user's browser with full access to the user's personal application/browser data:

<span>Confirmation: <script>dangerous javascript code here</script></span>