baserCMS is a website development framework. Starting in version 5.0.0-beta1 and prior to versions 5.3.2 and 5.4.2, `PermissionGroupsService::build()` reads a plugin's `config/permission.php` to decide what each user group may reach. When that file is absent it writes a wildcard allow rule instead: `url` `/baser/<prefix>/<plugin>/*`, `method` `*`, `auth` true, for every non-admin group. BcCustomContent has no such file in any release.
After an administrator installs it, the default `operators` group can store and execute arbitrary PHP under the document root. Versions 5.3.2 and 5.4.2 patch the issue.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
Active
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/baserproject/basercms/commit/2ed19c878add5c26fc765572e0e7717…
security-advisories@github.com
https://github.com/baserproject/basercms/commit/b0ef31b10dc6267b48ebc9a80d34bc7…
security-advisories@github.com
https://github.com/baserproject/basercms/releases/tag/5.3.2
security-advisories@github.com
https://github.com/baserproject/basercms/releases/tag/5.4.2
security-advisories@github.com
https://github.com/baserproject/basercms/security/advisories/GHSA-8jrp-4h7c-m679
security-advisories@github.com