Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| 1000Mz | Chestnutcms | <= 1.5.0 |
Related Weaknesses (CWE)
References
- https://gitee.com/liweiyi/ChestnutCMSProduct
- https://github.com/Zerone0x00/CVE/blob/main/ChestnutCMS/CVE-2024-56828.mdExploitThird Party Advisory
- https://www.1000mz.com/Product
FAQ
What is CVE-2024-56828?
CVE-2024-56828 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 pa...
How severe is CVE-2024-56828?
CVE-2024-56828 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2024-56828?
Check the references section above for vendor advisories and patch information. Affected products include: 1000Mz Chestnutcms.