CVE-2020-35949 : Exploit Details and Defense Strategies

An issue was discovered in the Quiz and Survey Master plugin before 7.0.1 for WordPress, allowing unauthenticated attackers to upload arbitrary files and achieve remote code execution.

Understanding CVE-2020-35949

This CVE involves a critical vulnerability in the Quiz and Survey Master plugin for WordPress, enabling attackers to execute remote code.

What is CVE-2020-35949?

The vulnerability in the Quiz and Survey Master plugin before version 7.0.1 for WordPress permits unauthenticated attackers to upload any files, leading to potential remote code execution. By exploiting a quiz question that allows file uploads, attackers can manipulate the Content-Type header during the upload process, enabling the use of text/plain for a .php file.

The Impact of CVE-2020-35949

The impact of this CVE is rated as critical, with a CVSS base score of 10. The confidentiality, integrity, and availability of affected systems are all at high risk, with no privileges required for exploitation.

Technical Details of CVE-2020-35949

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability allows unauthenticated attackers to upload arbitrary files, potentially leading to remote code execution.

Affected Systems and Versions

Product: Quiz and Survey Master plugin
Vendor: N/A
Versions affected: Before 7.0.1

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
Scope: Changed
User Interaction: None
Vector String: CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:C/UI:N

Mitigation and Prevention

Protecting systems from CVE-2020-35949 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the Quiz and Survey Master plugin to version 7.0.1 or later.
Monitor system logs for any suspicious file uploads.
Implement network-level security measures to detect and block malicious file uploads.

Long-Term Security Practices

Regularly audit and review file upload functionalities in plugins.
Educate users on safe file upload practices to prevent malicious uploads.

Patching and Updates

Apply security patches promptly to all plugins and software to prevent known vulnerabilities.