HIGH7.6

GHSA-673x-f5wx-fxpw

Cross Site Scripting and RCE in baserCMS

Quick fix

GHSA-673x-f5wx-fxpw — baserproject/basercms: upgrade to the fixed version with the command below.

composer require baserproject/basercms:^4.3.7

Details

baserCMS 4.3.6 and earlier is affected by Cross Site Scripting (XSS) and Remote Code Execution (RCE).

* Impact: XSS to RCE via Arbitrary file upload. * Attack vector is: Administrator must be logged in. * Components are: ThemeFilesController.php, UploaderFilesController.php. * Tested baserCMS Version : 4.3.6 (Latest) * Affected baserCMS Version : 4.2.0 ~ 4.3.6 (XSS), 3.0.10 ~ 4.3.6 (RCE) * Patches : https://basercms.net/security/20200827

Found by Vulnerability Research team in [Flatt Security Inc.](https://flatt.tech/)

Are you affected?

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Affected packages

Packagist/baserproject/basercms

Introduced in: 4.0.0Fixed in: 4.3.7

Fixcomposer require baserproject/basercms:^4.3.7

References

https://github.com/baserproject/basercms/security/advisories/GHSA-673x-f5wx-fxpw[WEB]
https://nvd.nist.gov/vuln/detail/CVE-2020-15159[ADVISORY]
https://github.com/baserproject/basercms/commit/16a7b3cd09a0ca355474119c76897eac2034a66d[WEB]
https://basercms.net/security/20200827[WEB]