CVE-2021-34624: Critical Vulnerability in ProperFraction ProfilePress

A vulnerability in the file uploader component found in the ~/src/Classes/FileUploader.php file of the ProfilePress WordPress plugin made it possible for users to upload arbitrary files during user registration or during profile updates. This issue affects versions 3.0.0 - 3.1.3. With a CVSS score of 9.8, this vulnerability is classified as critical, presenting a severe risk to organizations using this plugin.

Risk to organizations includes unauthorized access to sensitive data, potential system compromise, and exploitation that may lead to further attacks within the network. Given the critical nature of this vulnerability, organizations must prioritize patching immediately.

Currently, there is no known exploit for this vulnerability, though its high severity and potential for exploitation make it a priority for all users of the affected plugin.

Organizations should evaluate their use of the ProfilePress plugin and implement the necessary patches as soon as available to prevent any potential breaches.

Vulnerability Details

The vulnerability allows users to upload arbitrary files, which could lead to remote code execution or other malicious activities. This vulnerability is classified under CWE-434, which pertains to improper filtering of file uploads.

The CVSS score of 9.8 indicates a critical severity level, where the attack vector is network-based with low complexity, requiring no privileges or user interaction. The confidentiality, integrity, and availability impacts are all rated as high.

The affected product is the ProfilePress plugin by ProperFraction, specifically versions 3.0.0 to 3.1.3, published on July 7, 2021.

Technical Analysis

The root cause of this vulnerability lies in the improper validation of file uploads in the ProfilePress plugin. Attackers may exploit this oversight to upload malicious files that could compromise the integrity and confidentiality of the site.

The attack vector is network-based, allowing potential attackers to exploit this vulnerability remotely. With low complexity, no privileges are required, and no user interaction is necessary to trigger the vulnerability. This significantly raises the risk profile for organizations using the affected versions.

If exploited, the impacts are severe: confidentiality, integrity, and availability of the system can all be compromised, leading to potential data breaches and service disruptions.

Risk & Impact Analysis

The potential risk to organizations includes unauthorized access to sensitive files, data breaches, and the possibility of attackers using the compromised system as a foothold for further attacks. Given the critical CVSS score, this vulnerability poses a significant threat to any organization utilizing the ProfilePress plugin.

The urgency for organizations is underscored by the high potential impact of exploitation. Organizations should address this vulnerability in their priority patch cycle to mitigate the risks associated with it.

With an EPSS score of 0.683, this vulnerability is in the higher risk percentile, indicating a strong likelihood of exploitation in the wild.

Exploitation Status

Affected Versions

The vulnerable versions of the ProfilePress plugin are 3.0.0 to 3.1.3. Organizations using these versions should take immediate action to update to the latest version to mitigate the risk associated with this vulnerability.

Mitigation & Remediation

Organizations should immediately upgrade to the latest version of the ProfilePress plugin to mitigate this vulnerability. If a patch is not available, consider disabling the file upload functionality until a resolution is implemented.

Additionally, implementing strict file type validation and monitoring for unauthorized file uploads can provide an extra layer of security. Organizations may also consider engaging in penetration testing to validate their defenses against such vulnerabilities.

Detection Guidance

Organizations should monitor log files for unusual file upload activity and implement alerts for unauthorized file types. Behavioral anomalies, such as an increase in file uploads from new users, should also be flagged for review.

AppSecure Threat Intelligence Insight

The long-term significance of CVE-2021-34624 highlights the vulnerabilities present in widely used plugins and the importance of regular updates and security assessments. This vulnerability serves as a reminder for organizations to maintain a robust security posture and stay vigilant against emerging threats.

Security teams should learn from this incident by implementing proactive measures and conducting regular security reviews to identify similar weaknesses. Organizations may also benefit from establishing a comprehensive vulnerability management program to mitigate risks associated with third-party components.

In conclusion, the exploitation of file upload vulnerabilities like CVE-2021-34624 presents a persistent threat across various platforms. Organizations must prioritize their security frameworks to adapt to evolving attack vectors.