CVE-2024-56828 (GCVE-0-2024-56828)

Vulnerability from cvelistv5 – Published: 2025-01-06 00:00 – Updated: 2025-01-14 20:50
VLAI
Summary
File Upload vulnerability in ChestnutCMS through 1.5.0. Based on the code analysis, it was determined that the /api/member/avatar API endpoint receives a base64 string as input. This string is then passed to the memberService.uploadAvatarByBase64 method for processing. Within the service, the base64-encoded image is parsed. For example, given a string like: data:image/html;base64,PGh0bWw+PGltZyBzcmM9eCBvbmVycm9yPWFsZXJ0KDEpPjwvaHRtbD4= the content after the comma is extracted and decoded using Base64.getDecoder().decode(). The substring from the 11th character up to the first occurrence of a semicolon (;) is assigned to the suffix variable (representing the file extension). The decoded content is then written to a file. However, the file extension is not validated, and since this functionality is exposed to the frontend, it poses significant security risks.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-14 20:47 UTC
CWE
  • n/a
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
mitre CNA under the mitre root
CNA scorecard E 29/100 over 2159 records in the last 180 days details
References
Show details on NVD website
To clipboard 

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