GHSA-5QJQ-69W6-FG57
Vulnerability from github – Published: 2021-06-07 21:48 – Updated: 2021-06-07 21:05Flarum'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 alert('test') 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.
Impact
All Flarum communities that run flarum v1.0.0 or v1.0.1 are impacted.
Patches
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 using:
composer update --prefer-dist --no-dev -a -W
You can then confirm you run the latest version using:
composer show flarum/core
Workarounds
None.
For more information
For any questions or comments on this vulnerability please visit https://discuss.flarum.org/d/27558.
For support questions create a discussion at https://discuss.flarum.org/t/support.
A reminder that if you ever become aware of a security issue in Flarum, please report it to us privately by emailing security@flarum.org, and we will address it promptly.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 1.0.1"
},
"package": {
"ecosystem": "Packagist",
"name": "flarum/core"
},
"ranges": [
{
"events": [
{
"introduced": "1.0.0"
},
{
"fixed": "1.0.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-32671"
],
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"github_reviewed": true,
"github_reviewed_at": "2021-06-07T21:05:48Z",
"nvd_published_at": "2021-06-07T22:15:00Z",
"severity": "CRITICAL"
},
"details": "Flarum\u0027s 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.\n\nThis 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 \u003cscript\u003ealert(\u0027test\u0027)\u003c/script\u003e 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.\n\n### Impact\n\nAll Flarum communities that run flarum v1.0.0 or v1.0.1 are impacted.\n\n### Patches\n\nThe 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 using:\n\n```\ncomposer update --prefer-dist --no-dev -a -W\n```\n\nYou can then confirm you run the latest version using:\n\n```\ncomposer show flarum/core\n```\n\n### Workarounds\n\n__None.__\n\n### For more information\n\nFor any questions or comments on this vulnerability please visit https://discuss.flarum.org/d/27558.\n\nFor support questions create a discussion at https://discuss.flarum.org/t/support.\n\nA reminder that if you ever become aware of a security issue in Flarum, please report it to us privately by emailing security@flarum.org, and we will address it promptly.\n",
"id": "GHSA-5qjq-69w6-fg57",
"modified": "2021-06-07T21:05:48Z",
"published": "2021-06-07T21:48:17Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/flarum/core/security/advisories/GHSA-5qjq-69w6-fg57"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-32671"
},
{
"type": "WEB",
"url": "https://github.com/flarum/core/commit/440bed81b8019dff00642c8f493b4909d505a28a"
},
{
"type": "WEB",
"url": "https://packagist.org/packages/flarum/core"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "XSS vulnerability with translator"
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.