Remote Code Execution Vulnerability in Umbraco Forms by Umbraco
CVE-2021-37334

9.8CRITICAL

Key Information:

Vendor

Umbraco

Status
Forms
Vendor
CVE Published:
25 August 2021

What is CVE-2021-37334?

Umbraco Forms, specifically versions 4.0.0 to 8.7.5, are susceptible to a security issue that allows for remote code execution and potential arbitrary file deletion. This vulnerability arises from improper validation of file extensions after the file is temporarily stored. By default, these files are kept in the application’s directory at %BASEDIR%/APP_DATA/TEMP/FileUploads/. Although access is limited through the root web.config file, an attacker can circumvent this by uploading a specially crafted web.config file, leading to the execution of malicious scripts and unauthorized command execution on the server.

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References

https://umbraco.com/blog/security-advisory-security-patch...
x_refsource_MISC
https://umbraco.com/blog/security-advisory-20th-of-july-2...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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