CVE-2021-28167 is a medium-severity vulnerability identified in Eclipse Openj9, specifically affecting versions up to 0.25.0. This vulnerability allows the usage of the jdk.internal.reflect.ConstantPool API, which can cause the Java Virtual Machine (JVM) to pre-resolve certain constant pool entries. Consequently, it permits users to call static methods or access static members without executing the class initialization method, potentially exposing uninitialized values.
The CVSS score for this vulnerability is 6.5, classified as medium severity. This score indicates a moderate risk that could lead to unauthorized access under specific conditions. Organizations utilizing Eclipse Openj9 should take this vulnerability seriously, as it could lead to scenarios where sensitive data may be exposed or manipulated.
Currently, there are no known exploits in the wild, but organizations should not underestimate the risk. The nature of this vulnerability suggests that it could be exploited by attackers who are familiar with the underlying system. Therefore, immediate action is warranted to remediate this issue.
Organizations should prioritize patching immediately. Regular updates and monitoring of vulnerable components are essential to maintaining a secure environment.
Vulnerability Details
The vulnerability is specifically linked to the Eclipse Openj9 component. The official description states that the use of the jdk.internal.reflect.ConstantPool API leads to pre-resolving certain constant pool entries, which can bypass the class initialization method.
The CVSS 3.1 vector string for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N, indicating a network attack vector with low complexity and no authentication required.
The CWE classification for this vulnerability is CWE-909, which pertains to 'Improper Control of Resource Identifiers.' This classification further highlights the nature of the risk associated with this vulnerability.
Technical Analysis
The root cause of this vulnerability stems from the inappropriate usage of the ConstantPool API. By allowing the JVM to pre-resolve certain constant pool entries, the integrity of the Java class initialization process is compromised. As a result, static methods and members can be accessed without the necessary initialization.
The attack vector for this vulnerability is classified as network-based, meaning that an attacker could potentially exploit it remotely. The attack complexity is rated low, indicating that the exploitation does not require advanced skills or resources.
No privileges are required for exploitation, and user interaction is not necessary. The impact on confidentiality and integrity is deemed low, while there is no impact on availability.
Risk & Impact Analysis
The real-world risk associated with CVE-2021-28167 includes the potential for unauthorized access to static class members, which could lead to the exposure of sensitive data or application state. Organizations using affected versions of Eclipse Openj9 should recognize the importance of addressing this vulnerability in a timely manner.
The blast radius of this vulnerability is significant, as it affects all users of the vulnerable versions of Eclipse Openj9. Given that no known exploits have been identified, organizations should still consider the potential for future exploitation as the vulnerability is well-understood.
The urgency for remediation is medium, corresponding to the CVSS score. Organizations are advised to address this vulnerability in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects all versions of Eclipse Openj9 prior to version 0.25.0. Organizations should ensure that they are using the latest patched versions to mitigate the associated risks.
Mitigation & Remediation
To mitigate this vulnerability, organizations should upgrade to the latest version of Eclipse Openj9. Ensure that you are using a version that is patched against CVE-2021-28167. For systems where an immediate upgrade is not feasible, consider implementing network controls to limit exposure.
For more information on penetration testing to validate security measures, organizations can consult resources on penetration testing and ensure proper configurations are in place to safeguard against potential exploitation.
Detection Guidance
Organizations should monitor application logs for any unusual access patterns, especially related to static method calls. Behavioral anomalies that deviate from expected usage patterns might indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-28167 highlights the importance of continuous monitoring and assessment of Java-based applications. As vulnerabilities evolve, organizations must adapt their security postures accordingly.
This vulnerability serves as a reminder of the need for robust application security practices and regular updates. Security teams should take proactive steps in identifying and mitigating potential weaknesses.
For further best practices in application security, consider reviewing our resources on application security assessments and understanding the importance of a penetration testing methodology to uncover vulnerabilities before attackers can exploit them.
Organizations must remain vigilant and engaged in ongoing security efforts to protect their systems from emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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