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GHSA-m3r7-8gw7-qwvc
No affected components available
Summary
A vulnerability exists in the FAQ Record component where a privileged attacker can trigger a file download on a victim's machine upon page visit by embedding it in an <iframe> element without user interaction or explicit consent.
Details
In http://localhost/admin/index.php?action=editentry&id=20&lang=en, where a FAQ record is either created or edited, an attacker can insert an iframe, as "source code", pointing to a prior "malicious" attachment that the attacker has uploaded via FAQ "new attachment" upload, such that any page visits to this FAQ will trigger an automated download (from the edit screen, download is automated; from the faq page view as a normal user, depending on the browser, a pop up confirmation may be presented before the actual download. Firebox browser, for instance, does not require any interactions).
PoC
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create a new FAQ record and upload a "malicious" file - in my case, I uploaded an eicar file. take note of the uri, ie <p><iframe "index.php?action=attachment&id=2"
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in the FAQ record, insert a "source code" blob using the "< >" button
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insert in the following snippet: <p><iframe src="index.php?action=attachment&id=2"></iframe></p> and save FAQ record
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once the edit page reloads, the malicious code will be downloaded onto the local machine without user interaction:
(uploaded a POC for easy demonstration: https://roy.demo.phpmyfaq.de/admin/index.php?action=editentry&id=20&lang=en although a fresh installation overwrites this demo instance every 24 hours)
(as a logged in normal user, visit: https://roy.demo.phpmyfaq.de/content/1/20/en/20.html)
Impact
Malicious code or binaries could be dropped on visitors' machines when visiting the FAQ platform. Take a worm or ransomware for instance.
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. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the integrity of the data.
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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