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List:       full-disclosure
Subject:    [FD] CVE-2024-30920: XSS Vulnerability in DerbyNet v9.0 via render-document.php
From:       Valentin Lobstein via Fulldisclosure <fulldisclosure () seclists ! org>
Date:       2024-04-03 18:38:08
Message-ID: l9WnVJuNiyg4ls8g5klDjeU75WHwvayF1OWIYRE4lo1ZrTpskypswalsZ89mw2gEpW-BEFB6-1cLoUC-jRyudQc0L3puGauUgFcpinlHzVg= () protonmail ! com
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CVE ID: CVE-2024-30920

Description:
A Cross Site Scripting (XSS) vulnerability has been identified in DerbyNet v9.0, specifically within the \
`render-document.php` component. This vulnerability allows a remote attacker to execute arbitrary code \
via crafted URLs. The root cause of the vulnerability is the application's failure to properly sanitize \
user input in document rendering paths, which permits the injection of malicious scripts.

Vulnerability Type: XSS (Cross Site Scripting)

Vendor of Product:
DerbyNet - https://github.com/jeffpiazza/derbynet

Affected Product Code Base:
DerbyNet - v9.0

Affected Component:
render-document.php

Attack Type:
Remote

Impact:
Code execution

Root Cause:
The vulnerability arises from the application's display of debug information, including \
`ORIG_SCRIPT_FILENAME`, `DOCUMENT_URI`, `SCRIPT_NAME`, and `PHP_SELF`. These debug outputs improperly \
handle user-supplied input by not sanitizing it before inclusion in the output, leading directly to XSS \
vulnerabilities when malicious inputs are rendered by the browser.

Attack Vectors:
The vulnerability can be exploited with URLs such as:
- `http://127.0.0.1:8000/render-document.php/racer/<img src=x onerror=alert(1)>`
- `http://127.0.0.1:8000/render-document.php/<img src=x onerror=alert(1)>`

Discoverer:
Valentin Lobstein

References:
- http://derbynet.com
- https://github.com/jeffpiazza/derbynet
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