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DerbyNet 9.0 render-document.php Cross Site Scripting

DerbyNet 9.0 render-document.php Cross Site Scripting
Posted Apr 5, 2024
Authored by Valentin Lobstein

DerbyNet version 9.0 suffers from a cross site scripting vulnerability in render-document.php.

tags | exploit, php, xss
advisories | CVE-2024-30920
SHA-256 | 6ac6f7dc08e5aa36734a4a3929671a6b16c39f23cfa800f533b74b3aa6969051

DerbyNet 9.0 render-document.php Cross Site Scripting

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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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