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GHSA-hm8r-95g3-5hj9
No affected components available
Summary
An attacker with admin privileges can upload an attachment containing JS code without extension and the application will render it as HTML which allows for XSS attacks.
Details
When attachments are uploaded without an extension, the application renders it as HTML by default. Therefore allowing attackers to upload .html files containing javascript code to perform XSS attacks. The direct file path to the uploaded attachment is also easily obtainable as it is made up of substrings of the file's MD5 hashes.
PoC
-
Admin users can upload attachments containing XSS payloads in files without extensions to bypass the .html extension check.
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Since the path of the uploaded file is built entirely on the file’s MD5 hash and the attachment directory, it is possible for an attacker to know the direct path of the uploaded file.
E.g file MD5 hash: 38fff51cb7248a06d6142c6bdf846831
URL will be: http://127.0.0.1/phpmyfaq/attachments/38fff/51cb7/248a0/6d6142c6bdf846831
- /attachments
- /38fff (first 5 chars of MD5 hash)
- /51cb7 (next 5 chars of MD5 hash)
- /248a0 (next 5 chars of MD5 hash)
- /6d6142c6bdf846831 (remaining chars of MD5 hash)
3. Even though the attachment was uploaded without a file extension, it is still rendered as .html, hence triggering the XSS payload.
Impact
This allows an attacker to execute arbitrary client side JavaScript within the context of another user's phpMyFAQ session.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data. There is a low impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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