CVE-2021-37334
Umbraco Forms Remote Code Execution and File Deletion Vulnerability
Description
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.
INFO
Published Date :
Aug. 25, 2021, 10:15 p.m.
Last Modified :
Nov. 28, 2021, 11:10 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-37334.
| URL | 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 |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-37334 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-37334 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Nov. 28, 2021
Action Type Old Value New Value Removed CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P) Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:C/I:C/A:C) -
CVE Modified by [email protected]
Nov. 22, 2021
Action Type Old Value New Value Changed Description A security issue in Umbraco Forms 4.0.0 to and including 8.7.5 could lead to a remote code execution attack and/or arbitrary file deletion. 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. -
Initial Analysis by [email protected]
Sep. 07, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://umbraco.com/blog/security-advisory-20th-of-july-2021-patch-is-now-available/ No Types Assigned https://umbraco.com/blog/security-advisory-20th-of-july-2021-patch-is-now-available/ Patch, Vendor Advisory Changed Reference Type https://umbraco.com/blog/security-advisory-security-patches-for-umbraco-forms-ready-on-july-20th-2021-at-7-am-utc/ No Types Assigned https://umbraco.com/blog/security-advisory-security-patches-for-umbraco-forms-ready-on-july-20th-2021-at-7-am-utc/ Vendor Advisory Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (excluding) 4.4.9 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 6.0.0 up to (excluding) 6.0.10 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 7.0.0 up to (excluding) 7.0.7 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 7.1.0 up to (excluding) 7.1.4 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 7.2.0 up to (excluding) 7.2.1 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 7.3.0 up to (excluding) 7.3.2 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 7.4.0 up to (excluding) 7.4.3 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 7.5.0 up to (excluding) 7.5.4 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 8.0.0 up to (excluding) 8.0.2 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 8.1.0 up to (excluding) 8.1.6 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 8.2.0 up to (excluding) 8.2.3 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 8.3.0 up to (excluding) 8.3.4 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 8.4.0 up to (excluding) 8.4.4 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 8.5.0 up to (excluding) 8.5.7 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 8.6.0 up to (excluding) 8.6.2 *cpe:2.3:a:umbraco:forms:*:*:*:*:*:*:*:* versions from (including) 8.7.0 up to (excluding) 8.7.6
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-37334 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-37334
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.68 }} 0.49%
score
0.87866
percentile