CVE-2020-11083
LOW3.5EPSS 0.92%Stored XSS in October
Description
### Impact A user with access to a markdown FormWidget that stores data persistently could create a stored XSS attack against themselves and any other users with access to the generated HTML from the field. ### Patches Issue has been patched in Build 466 (v1.0.466) & RainLab.Blog v1.4.1 by restricting the ability to store JS in markdown to only users that have been explicitly granted the `backend.allow_unsafe_markdown` permission. ### Workarounds Apply https://github.com/octobercms/october/commit/9ecfb4867baae14a0d3f99f5b5c1e8a979ae8746 & https://github.com/rainlab/blog-plugin/commit/6ae19a6e16ef3ba730692bc899851342c858bb94 to your installation manually if unable to upgrade to Build 466 or v1.4.1 of RainLab.Blog (if using that plugin). ### References Reported by [Sivanesh Ashok](https://stazot.com/) ### For more information If you have any questions or comments about this advisory: * Email us at [[email protected]](mailto:[email protected]) ### Threat assessment: <img width="1100" alt="Screen Shot 2020-03-31 at 2 01 52 PM" src="https://user-images.githubusercontent.com/7253840/78070158-8f7ef580-7358-11ea-950c-226533f6a0a3.png">
Affected packages (1)
- Packagist/october/backend>= 1.0.319, < 1.0.466
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.5 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N |
References (6)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2020-11083
- WEBhttp://packetstormsecurity.com/files/158730/October-CMS-Build-465-XSS-File-Read-File-Deletion-CSV-Injection.html
- WEBhttp://seclists.org/fulldisclosure/2020/Aug/2
- WEBhttps://github.com/octobercms/october/commit/9ecfb4867baae14a0d3f99f5b5c1e8a979ae8746
- WEBhttps://github.com/octobercms/october/security/advisories/GHSA-w4pj-7p68-3vgv
- WEBhttps://github.com/rainlab/blog-plugin/commit/6ae19a6e16ef3ba730692bc899851342c858bb94