CVE-2023-46589 is a high-severity vulnerability identified in Apache Tomcat, a widely-used open-source implementation of the Java Servlet, JavaServer Pages, and Java Expression Language technologies. This vulnerability allows improper input validation in versions 11.0.0-M1 through 11.0.0-M10, 10.1.0-M1 through 10.1.15, 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95. Specifically, the issue arises from Tomcat's incorrect parsing of HTTP trailer headers, which can lead to request smuggling when behind a reverse proxy.
The CVSS score for this vulnerability is 7.5, categorized as high severity. The implications are significant, as an attacker could manipulate trailer headers to cause Tomcat to misinterpret a single request as multiple requests. This misinterpretation can lead to unauthorized actions if exploited effectively. Organizations utilizing affected versions of Tomcat should take immediate action to address this vulnerability.
Apache has recommended upgrading to version 11.0.0-M11 or later, 10.1.16 or later, 9.0.83 or later, or 8.5.96 or later to mitigate the risk posed by this vulnerability. Organizations must assess their environments to prioritize patching and ensure they are not running vulnerable versions.
The urgency for defenders is high, as organizations could face significant risks, including unauthorized access and potential data breaches. It is crucial to act swiftly and implement the necessary updates to safeguard systems.
Vulnerability Details
The vulnerability stems from inadequate input validation in Apache Tomcat, specifically regarding HTTP trailer headers. In certain configurations, a trailer header that exceeds the expected size can lead to Tomcat misinterpreting requests, increasing the risk of request smuggling. The official CVE description emphasizes that this issue affects multiple versions of Tomcat, necessitating prompt remediation.
CWE-444, which denotes 'Inconsistent Interpretation of HTTP Requests,' is the underlying weakness associated with this vulnerability. Organizations are encouraged to review their deployment of Apache Tomcat and apply the recommended patches to mitigate potential exploitation.
Technical Analysis
The root cause of CVE-2023-46589 lies in Apache Tomcat's failure to correctly parse HTTP trailer headers, which can lead to improper handling of requests. The attack vector for this vulnerability is network-based, with a low attack complexity, meaning that an attacker does not require advanced skills to exploit it. No privileges are required for exploitation, nor is user interaction necessary.
The impacts of this vulnerability include high integrity impact, as attackers may manipulate requests to perform unauthorized actions. However, there is no impact on confidentiality or availability. Given the nature of the vulnerability, organizations must be vigilant and monitor their environments for any signs of exploitation.
Risk & Impact Analysis
Risk to organizations includes the potential for unauthorized actions being executed through manipulated requests, which could lead to data breaches or service disruptions. The blast radius is significant, affecting all users and services reliant on the vulnerable versions of Apache Tomcat. Given the high severity of this vulnerability with a CVSS score of 7.5, organizations should prioritize patching immediately.
The urgency for remediation is further underscored by the EPSS score of 0.514, placing it in the 97th percentile, indicating a higher likelihood of exploitation. Organizations are advised to integrate this vulnerability into their risk management frameworks and ensure appropriate measures are taken to mitigate the associated risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of Apache Tomcat include versions from 11.0.0-M1 to 11.0.0-M10, from 10.1.0-M1 to 10.1.15, from 9.0.0-M1 to 9.0.82, and from 8.5.0 to 8.5.95. Organizations should ensure they are running version 11.0.0-M11 or later, 10.1.16 or later, 9.0.83 or later, or 8.5.96 or later to mitigate the vulnerability.
Mitigation & Remediation
To mitigate the risks associated with CVE-2023-46589, it is imperative for organizations to upgrade to the recommended patched versions of Apache Tomcat: version 11.0.0-M11 or later, 10.1.16 or later, 9.0.83 or later, or 8.5.96 or later. If immediate patching is not feasible, organizations should implement strict network controls to limit access to vulnerable instances and regularly monitor for any suspicious activity.
Additionally, organizations can consider employing continuous penetration testing to validate the effectiveness of their security measures and ensure that vulnerabilities are promptly identified and addressed. For further information on effective penetration testing strategies, refer to the comprehensive guide on penetration testing provided by AppSecure.
Detection Guidance
Organizations should monitor their logs for indicators of exploitation attempts, such as unusual request patterns or error messages related to trailer headers. Behavioral anomalies, especially those involving unexpected responses from the server, should also be flagged. Network signatures that identify malformed HTTP requests can further aid in detection, as well as monitoring for unauthorized changes in system configurations.
AppSecure Threat Intelligence Insight
CVE-2023-46589 underscores the importance of robust input validation in web applications. As organizations increasingly rely on frameworks like Apache Tomcat, the potential attack surface expands, making it essential for security teams to stay vigilant. This vulnerability highlights a pattern in web vulnerabilities where improper handling of input can lead to severe exploitation possibilities.
Organizations should consider integrating lessons learned from this incident into their security practices to strengthen their defenses against similar vulnerabilities. Continuous evaluation and adaptation of security measures are paramount in the ever-evolving threat landscape. For further insights on improving security practices, refer to our article on vulnerability management programs and strategies for effective security testing, such as the penetration testing methodology guide by AppSecure.
Lastly, security teams should remain informed about new vulnerabilities and updates through reliable channels to ensure they can respond effectively and maintain a strong security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)