Umbraco Forms version 4.0.0 up to and including 8.7.5 and below are vulnerable to a security flaw that could lead to a remote code execution attack and/or arbitrary file deletion. A vulnerability occurs because validation of the file extension is performed after the file has been stored in a temporary directory. By default, files are stored within the application directory structure at %BASEDIR%/APP_DATA/TEMP/FileUploads/. Whilst access to this directory is restricted by the root web.config file, it is possible to override this restriction by uploading another specially crafted web.config file to the temporary directory. It is possible to exploit this flaw to upload a malicious script file to execute arbitrary code and system commands on the server.
References
| Link | Resource |
|---|---|
| https://umbraco.com/blog/security-advisory-20th-of-july-2021-patch-is-now-available/ | Patch Vendor Advisory |
| https://umbraco.com/blog/security-advisory-security-patches-for-umbraco-forms-ready-on-july-20th-2021-at-7-am-utc/ | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
28 Nov 2021, 23:10
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : 9.3
v3 : 9.8 |
22 Nov 2021, 21:15
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | Umbraco Forms version 4.0.0 up to and including 8.7.5 and below are vulnerable to a security flaw that could lead to a remote code execution attack and/or arbitrary file deletion. A vulnerability occurs because validation of the file extension is performed after the file has been stored in a temporary directory. By default, files are stored within the application directory structure at %BASEDIR%/APP_DATA/TEMP/FileUploads/. Whilst access to this directory is restricted by the root web.config file, it is possible to override this restriction by uploading another specially crafted web.config file to the temporary directory. It is possible to exploit this flaw to upload a malicious script file to execute arbitrary code and system commands on the server. |
07 Sep 2021, 16:50
| Type | Values Removed | Values Added |
|---|---|---|
| References | (MISC) https://umbraco.com/blog/security-advisory-20th-of-july-2021-patch-is-now-available/ - Patch, Vendor Advisory | |
| References | (MISC) https://umbraco.com/blog/security-advisory-security-patches-for-umbraco-forms-ready-on-july-20th-2021-at-7-am-utc/ - Vendor Advisory | |
| CWE | NVD-CWE-noinfo | |
| CPE | cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : 6.8
v3 : 9.8 |
25 Aug 2021, 22:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2021-08-25 22:15
Updated : 2023-12-10 13:55
NVD link : CVE-2021-37334
Mitre link : CVE-2021-37334
CVE.ORG link : CVE-2021-37334
JSON object : View
Products Affected
umbraco
- forms
CWE