CVE-2023-45554
Published: 25 October 2023
Summary
CVE-2023-45554 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Zzzcms Zzzcms. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 7.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
zzzCMS version 2.1.9 contains a file-upload flaw (CWE-434) that permits an attacker to bypass the intended restriction on image file extensions. By changing the imageext configuration value from the default list of jpg, jpeg, gif, and png to include the additional extension pphphp, an uploaded file can be saved with an executable PHP suffix.
An unauthenticated remote attacker can exploit the weakness over the network without user interaction. Successful abuse allows the attacker to upload and execute arbitrary code on the server, resulting in complete confidentiality, integrity, and availability impact as reflected in the CVSS 9.8 base score.
The associated EPSS score has remained near 0.10 with no pronounced upward movement after disclosure. Public references consist of technical write-ups that demonstrate the parameter modification but do not describe vendor patches or official mitigation steps.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-49846
Vulnerability details
File Upload vulnerability in zzzCMS v.2.1.9 allows a remote attacker to execute arbitrary code via modification of the imageext parameter from jpg, jpeg,gif, and png to jpg, jpeg,gif, png, pphphp.
- 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.