CVE-2022-39958 affects the OWASP ModSecurity Core Rule Set (CRS) and is classified as a high-severity vulnerability with a CVSS score of 7.5. This vulnerability allows attackers to exploit a weakness in the CRS to bypass protections typically provided by web application firewalls. By exploiting this flaw, attackers can sequentially exfiltrate small and undetectable sections of data through the HTTP Range header field, ultimately accessing restricted resources without detection.
The implications of this vulnerability are significant as it allows unauthorized access to sensitive data that would ordinarily be protected by the CRS. The vulnerability primarily affects legacy versions 3.0.x and 3.1.x, as well as supported versions 3.2.1 and 3.3.2. The urgency to address this vulnerability is underscored by the potential for serious data breaches, making immediate remediation essential.
Organizations using affected versions of the CRS are advised to upgrade to versions 3.2.2 and 3.3.3 and to configure a CRS paranoia level of 3 or higher. This configuration enhances the ability to detect and mitigate the bypass attempts associated with CVE-2022-39958.
In summary, CVE-2022-39958 poses a high risk to organizations relying on the OWASP ModSecurity Core Rule Set for web application security. Timely patching and configuration adjustments are paramount to maintain the integrity of web applications and protect sensitive data from unauthorized access.
Vulnerability Details
The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass that allows attackers to exfiltrate data by submitting HTTP Range header fields with small byte ranges. This vulnerability allows access to restricted resources without detection, despite protections from a web application firewall. The affected versions include legacy CRS 3.0.x and 3.1.x, as well as the currently supported versions 3.2.1 and 3.3.2. The recommended action is to upgrade to versions 3.2.2 and 3.3.3 and configure a paranoia level of 3 or higher.
The vulnerability is classified under CWE-863 and CWE-116, with a CVSS score of 7.5 indicating high severity. This score reflects the potential impact of high confidentiality loss without affecting integrity or availability. The attack vector is network-based with low complexity and no privileges or user interaction required.
The vulnerability was published on September 20, 2022, and is currently modified. Organizations should be aware of the potential for exploitation and act promptly to implement recommended patches.
Technical Analysis
The root cause of CVE-2022-39958 lies in the handling of HTTP Range headers within the OWASP ModSecurity CRS. Attackers can leverage this capability to send requests that bypass standard access controls, allowing them to extract data from backend systems without triggering alerts from the web application firewall.
The attack vector is network-based, meaning that remote attackers can exploit this vulnerability without needing physical access to the targeted system. The complexity of the attack is classified as low, requiring no special privileges or user interaction, making it relatively easy for attackers to exploit.
In terms of impact, the vulnerability primarily affects confidentiality, with a high impact score indicating significant risk to sensitive data. However, it does not affect integrity or availability, meaning that while data can be exfiltrated, it remains unchanged in its original location.
Risk & Impact Analysis
The deployment of CVE-2022-39958 carries substantial risks for organizations that utilize the OWASP ModSecurity CRS. The potential for data exfiltration poses a serious threat, particularly for organizations that handle sensitive information. Attackers may leverage this vulnerability to gain unauthorized access to protected data, leading to breaches that can have severe repercussions.
The blast radius for this vulnerability is significant, as it can affect any organization using the impacted versions of the CRS. Given the widespread deployment of web application firewalls that rely on the CRS for security, the urgency for remediation is high. Organizations must prioritize patching to mitigate the risks associated with this vulnerability.
With a CVSS score of 7.5, organizations should address this vulnerability in their priority patch cycle. The potential for exploitation, although not confirmed, underscores the necessity for immediate action to safeguard sensitive data and maintain compliance with security best practices.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects the following versions of the OWASP ModSecurity Core Rule Set:
1. Legacy versions: 3.0.x and 3.1.x 2. Supported versions: 3.2.1 and 3.3.2 3. Recommended upgrades: 3.2.2 and 3.3.3
Mitigation & Remediation
To mitigate the risks associated with CVE-2022-39958, organizations should take the following actions:
1. Upgrade to the latest versions of the OWASP ModSecurity Core Rule Set: 3.2.2 and 3.3.3, which contain fixes for this vulnerability.
2. Configure a paranoia level of 3 or higher to enhance detection and prevention capabilities.
3. Regularly review and update web application firewall configurations to ensure optimal protection against data exfiltration attempts.
4. Implement additional network controls and monitoring to detect abnormal behavior associated with this vulnerability.
For further information on penetration testing services to validate security measures, organizations should consider engaging in penetration testing that exercises the patched code path.
Detection Guidance
To effectively detect and respond to potential exploitation of CVE-2022-39958, organizations should monitor for the following indicators:
1. Review logs for unusual HTTP Range header requests that may indicate attempts to exfiltrate data.
2. Monitor for behavioral anomalies that deviate from normal application access patterns.
3. Implement network signatures that can identify potential exploitation attempts targeting the OWASP ModSecurity CRS.
4. Ensure systems are configured to log changes and access to sensitive resources for auditing purposes.
AppSecure Threat Intelligence Insight
CVE-2022-39958 represents a critical vulnerability that highlights the importance of robust web application security measures. The ability to bypass security controls underscores the need for continuous monitoring and improvement of web application firewalls.
Organizations must learn from this vulnerability and consider adopting a more proactive approach to security, including regular updates and thorough testing of web application defenses. Engaging in vulnerability management programs can help organizations to identify and remediate potential weaknesses in their applications.
Additionally, organizations should consider leveraging security assessments and penetration testing methodologies to ensure their defenses are robust against emerging threats.
Lastly, organizations should remain vigilant about potential trends in exploitation tactics and consider incorporating advanced threat intelligence solutions to enhance their security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)