CVE-2023-21939 is a medium-severity vulnerability in the Oracle Java SE and Oracle GraalVM Enterprise Edition products. The vulnerability is found in the Swing component and affects supported versions of Oracle Java SE, including 8u361, 11.0.18, and 17.0.6, as well as GraalVM versions 20.3.9 and later. This vulnerability allows an unauthenticated attacker with network access via HTTP to compromise these Java products. Successful exploitation could lead to unauthorized update, insert, or delete access to accessible data.
Given the nature of the vulnerability, it primarily affects Java deployments that utilize sandboxed Java Web Start applications or applets, which load untrusted code from the internet and rely on the Java security sandbox. Attackers could also exploit this vulnerability through APIs in the specified component, such as via a web service that provides data to the APIs.
The CVSS 3.1 base score for this vulnerability is 5.3, indicating a medium severity level. The attack vector is classified as network-based, with a low complexity of exploitation and no required privileges or user interaction. Organizations using the affected versions should prioritize patching to mitigate potential risks.
Organizations should act swiftly, given that successful exploitation can lead to significant data integrity impacts. The urgency for defenders to address this vulnerability is high, and immediate patching is essential to safeguard against potential data breaches.
Vulnerability Details
The vulnerability affects several versions of Oracle Java SE and GraalVM, specifically targeting the Swing component. The impacted versions include:
Oracle Java SE: 8u361, 11.0.18, 17.0.6, 20; Oracle GraalVM: 20.3.9, 21.3.5, 22.3.1.
The CVSS score of 5.3 indicates a medium severity level, reflecting the potential impacts this vulnerability poses to data integrity. Due to the nature of the vulnerability, it has a straightforward attack vector, which further emphasizes the need for immediate action.
Technical Analysis
The root cause of CVE-2023-21939 stems from improper handling of network requests by the affected components in Oracle Java SE and GraalVM. Attackers can exploit this vulnerability by sending crafted requests over HTTP, which can be processed incorrectly, allowing unauthorized access to modify or delete data.
The attack vector is network-based, requiring no local access. The complexity of exploiting this vulnerability is low, meaning that an attacker does not need advanced skills to exploit it successfully. There are no privileges required for exploitation, and user interaction is not necessary, making it a significant threat.
The vulnerability has a low impact on confidentiality but a notable impact on integrity, as unauthorized changes can be made to the data. Availability remains unaffected, highlighting the primary risk is data integrity.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2023-21939 is notable, particularly for organizations that utilize Java SE and GraalVM in environments that run untrusted code. The potential for unauthorized data modification could have severe implications for data integrity and trustworthiness.
The urgency for organizations to address this vulnerability is high, especially considering the CVSS score of 5.3. Organizations should prioritize this in their patching cycle to mitigate risks. The potential blast radius includes any data that could be accessed or modified through Java applications using the affected components.
Given the exploitation capabilities and the medium severity level, organizations must recognize the importance of timely remediation. The risk to organizations includes possible data breaches, loss of integrity, and reputational damage.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Oracle Java SE and GraalVM are affected by this vulnerability:
Oracle Java SE: 8u361, 11.0.18, 17.0.6, 20; Oracle GraalVM: 20.3.9, 21.3.5, 22.3.1.
Mitigation & Remediation
Organizations should prioritize patching to the latest versions of Oracle Java SE and GraalVM Enterprise Edition. Ensure that you are using versions that are not listed as vulnerable. For detailed steps on patching and security testing, organizations can refer to penetration testing services that validate the effectiveness of the patches.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual network activity originating from untrusted sources. Additionally, behavioral anomalies in Java application behavior should be logged and investigated.
AppSecure Threat Intelligence Insight
CVE-2023-21939 highlights a significant risk for Java application deployments, particularly those handling untrusted code. The pattern of vulnerabilities in widely used technologies like Java necessitates robust security practices, including regular updates and rigorous security testing. Organizations should consider engaging in penetration testing to identify and remediate potential weaknesses in their applications.
Furthermore, organizations should draw lessons from the exploitation potential of vulnerabilities in significant platforms and ensure that their security posture is proactive. Adopting a comprehensive vulnerability management program can help organizations better manage their security risks.
In conclusion, organizations leveraging Oracle Java SE or GraalVM should remain vigilant and update their systems to mitigate the risks associated with CVE-2023-21939.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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