The vulnerability identified as CVE-2022-23993 is a cross-site scripting (XSS) issue found in pfSense CE versions prior to 2.6.0 and pfSense Plus versions before 22.01. Specifically, the issue arises in the /usr/local/www/pkg.php file, where the system improperly handles user input from the $_REQUEST['pkg_filter'] variable. This can lead to malicious scripts being executed in the context of the user’s session.
With a CVSS score of 6.1, this vulnerability is classified as medium severity, indicating that while it does not pose an immediate critical threat, it can still be exploited under certain circumstances. Attackers may leverage this vulnerability to execute arbitrary scripts in the user’s browser, which can lead to data theft or unauthorized actions performed on behalf of the user.
Risk to organizations includes potential unauthorized access to sensitive information and disruption of services. As such, it is crucial for organizations using these versions of pfSense to address this issue promptly. The urgency for defenders is heightened given the potential for exploitation if left unmitigated.
Currently, there are no known public exploits or proof of concepts available for this vulnerability, indicating that it may not yet be actively exploited in the wild. However, organizations should not be complacent and should ensure that they are running the latest versions to mitigate any potential risks.
Organizations should prioritize patching immediately to safeguard against potential exploits and ensure system integrity.
Vulnerability Details
CVE-2022-23993 allows for cross-site scripting through improper handling of user input. The vulnerability affects pfSense CE before version 2.6.0 and pfSense Plus before version 22.01. The CVSS score of 6.1 indicates a medium severity level, which suggests a moderate risk to users and organizations. Published on January 26, 2022, this vulnerability is classified under CWE-79.
Technical Analysis
The root cause of CVE-2022-23993 stems from improper input validation in the PHP script located at /usr/local/www/pkg.php. The attack vector is network-based, meaning an attacker can exploit this vulnerability over the internet. The attack complexity is low, as it requires no special privileges or sophisticated techniques. User interaction is required, as the victim must click on a malicious link that triggers the XSS.
The confidentiality and integrity impacts are classified as low, since the attacker may only have limited access to manipulate the information displayed to the user. The availability impact is none, as this vulnerability does not affect the operational capacity of the application.
Risk & Impact Analysis
Organizations running vulnerable versions of pfSense may face significant risks, including unauthorized access to user accounts and the execution of arbitrary scripts in the users' browsers. The blast radius can be considerable, particularly if the pfSense firewall is widely used across an organization’s network. Given the medium CVSS score, organizations should address this vulnerability in their patching cycle.
The urgency assessment indicates that this vulnerability should be addressed in the priority patch cycle to reduce the likelihood of exploitation and protect sensitive data.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects pfSense CE before version 2.6.0 and pfSense Plus before version 22.01. Organizations using these versions should upgrade to the latest version to mitigate the risks associated with this vulnerability.
Mitigation & Remediation
Organizations are recommended to apply the latest patches available for pfSense and pfSense Plus. The specific versions to upgrade to are pfSense CE 2.6.0 or later and pfSense Plus 22.01 or later. If immediate patching is not feasible, organizations should implement web application firewall rules to filter potentially malicious input or disable the affected functionality as a temporary measure.
For further insights into continuous security testing, organizations may refer to continuous penetration testing services to validate the effectiveness of their mitigations.
Detection Guidance
Monitoring for unusual behavior associated with user input in the pfSense web interface should be a priority. Organizations should implement logging mechanisms to capture any unexpected errors or XSS payloads being executed in user sessions. Additionally, employing network intrusion detection systems can help identify potential attacks exploiting this vulnerability.
AppSecure Threat Intelligence Insight
The significance of CVE-2022-23993 lies in its potential to serve as a vector for broader attacks within networked environments. Security teams should note the importance of consistent patch management as a key defense strategy against evolving threats. The low exploitation likelihood reported does not guarantee immunity; hence proactive measures should be a priority.
To enhance security posture, organizations are encouraged to review their vulnerability management program, implement effective penetration testing methodologies, and integrate security testing into their development lifecycle.
Security teams should also be aware of the ongoing trends in XSS vulnerabilities to better prepare for future threats. Continuous education on security best practices is essential for maintaining a robust defense against such vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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