baserCMS File Uploader Remote Code Execution (RCE) vulnerability

Description

Impact

There is a Remote Code Execution (RCE) Vulnerability on the management system of baserCMS.

Target

baserCMS 4.7.3 and earlier versions

Patches

Update to the latest version of baserCMS

Credits

島峰泰平@三井物産セキュアディレクション株式会社

Basic information

Type
reviewed
Severity
critical
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2023-03-23 20:00:08 UTC
Updated
2023-03-28 18:06:06 UTC
GitHub reviewed
2023-03-23 20:00:08 UTC
NVD published
2023-03-23

EPSS Score

Score Percentile
2.27% 84.52%

CVSS Scores

Base score Version Severity Vector
9.8 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

CWEs

CWE id Name
CWE-434 Unrestricted Upload of File with Dangerous Type

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
composer baserproject/basercms < 4.7.5 4.7.5

References

cvelogic Threat Intelligence