CVE-2023-38836
Published: 21 August 2023
Summary
CVE-2023-38836 is a high-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Boidcms Boidcms. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 0.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
BoidCMS version 2.0.0 contains a file upload vulnerability tracked as CVE-2023-38836 that permits remote code execution. The flaw stems from insufficient MIME type validation in the upload handling logic, allowing an attacker to bypass checks by prepending a GIF header to a malicious file. The issue is classified under CWE-434 and carries a CVSS 3.1 score of 8.8.
An authenticated user with low privileges can upload the crafted file over the network and trigger execution of arbitrary code on the server. Successful exploitation grants the attacker full control over confidentiality, integrity, and availability of the affected installation without requiring user interaction.
The associated EPSS score currently stands at 0.8827 with a recorded peak of 0.9044, indicating sustained exploitation interest following public disclosure. Public references include a detailed proof-of-concept on Packet Storm and an open issue on the BoidCMS GitHub repository.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-42609
Vulnerability details
File Upload vulnerability in BoidCMS v.2.0.0 allows a remote attacker to execute arbitrary code by adding a GIF header to bypass MIME type checks.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Requiring identifiable owners for portable devices reduces the attack surface for unrestricted uploads of dangerous file types via anonymous media.
Dangerous file uploads can be detonated in the chamber to determine malice before any production write or execution occurs.
Prevents unrestricted writing of arbitrary or malicious firmware by keeping hardware write-protect enabled except under tightly controlled manual procedures.
Scans files from external sources on download/open/execute, blocking unrestricted uploads of dangerous file types.