CVE-2021-32671
"Flarum Cross-Site Scripting (XSS) Vulnerability"
Description
Flarum is a forum software for building communities. Flarum's translation system allowed for string inputs to be converted into HTML DOM nodes when rendered. This change was made after v0.1.0-beta.16 (our last beta before v1.0.0) and was not noticed or documented. This allowed for any user to type malicious HTML markup within certain user input fields and have this execute on client browsers. The example which led to the discovery of this vulnerability was in the forum search box. Entering faux-malicious HTML markup, such as <script>alert('test')</script> resulted in an alert box appearing on the forum. This attack could also be modified to perform AJAX requests on behalf of a user, possibly deleting discussions, modifying their settings or profile, or even modifying settings on the Admin panel if the attack was targetted towards a privileged user. All Flarum communities that run flarum v1.0.0 or v1.0.1 are impacted. The vulnerability has been fixed and published as flarum/core v1.0.2. All communities running Flarum v1.0 have to upgrade as soon as possible to v1.0.2.
INFO
Published Date :
June 7, 2021, 10:15 p.m.
Last Modified :
June 17, 2021, 3:37 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
6.0
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-32671 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-32671.
| URL | Resource |
|---|---|
| https://github.com/flarum/core/commit/440bed81b8019dff00642c8f493b4909d505a28a | Patch Third Party Advisory |
| https://github.com/flarum/core/security/advisories/GHSA-5qjq-69w6-fg57 | Third Party Advisory |
| https://packagist.org/packages/flarum/core | Product Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-32671 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-32671 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jun. 17, 2021
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Changed Reference Type https://github.com/flarum/core/commit/440bed81b8019dff00642c8f493b4909d505a28a No Types Assigned https://github.com/flarum/core/commit/440bed81b8019dff00642c8f493b4909d505a28a Patch, Third Party Advisory Changed Reference Type https://github.com/flarum/core/security/advisories/GHSA-5qjq-69w6-fg57 No Types Assigned https://github.com/flarum/core/security/advisories/GHSA-5qjq-69w6-fg57 Third Party Advisory Changed Reference Type https://packagist.org/packages/flarum/core No Types Assigned https://packagist.org/packages/flarum/core Product, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:flarum:flarum:1.0.0:*:*:*:*:*:*:* *cpe:2.3:a:flarum:flarum:1.0.1:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-32671 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-32671
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.23 }} 0.02%
score
0.60433
percentile