A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier. This vulnerability allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way. With a CVSS score of 9.8, this vulnerability is classified as critical.
Risk to organizations includes potential unauthorized access to sensitive data, manipulation of application behavior, and service disruption. Given the nature of this vulnerability, attackers may leverage it to gain control over affected systems.
Organizations should prioritize patching immediately. The availability of exploit code further emphasizes the need for urgent remediation.
This vulnerability has been added to the Known Exploited Vulnerabilities (KEV) catalog, indicating its active exploitation in the wild.
Vulnerability Details
The vulnerability is specifically located in the MetaClass.java file of the Stapler framework. It is associated with the Common Weakness Enumeration (CWE) ID CWE-502, which pertains to deserialization of untrusted data.
The publication date for this vulnerability was December 10, 2018. The affected products include Jenkins and Red Hat OpenShift Container Platform 3.11.
Technical Analysis
The root cause of this vulnerability is the improper handling of user inputs in the Stapler framework, allowing crafted inputs to invoke Java methods that should remain inaccessible. The attack vector is network-based, with low complexity, requiring no special privileges or user interaction.
The impacts of this vulnerability are severe, affecting confidentiality, integrity, and availability, with the highest ratings in each category. This poses a significant risk for organizations using affected versions.
Risk & Impact Analysis
Real-world deployment risk is substantial due to the critical nature of the vulnerability and its high CVSS score. Organizations utilizing Jenkins should assess their exposure and prioritize remediation efforts.
The blast radius potential of this vulnerability is wide, affecting not just individual installations but potentially organizational infrastructure if exploited. Organizations must remain vigilant and responsive to patching this vulnerability.
Given the CVSS score and its inclusion in the KEV catalog, organizations should treat this vulnerability with high urgency.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions include Jenkins 2.153 and earlier, as well as LTS 2.138.3 and earlier. Additionally, Red Hat OpenShift Container Platform 3.11 is also impacted.
Mitigation & Remediation
To remediate this vulnerability, organizations should apply updates as per vendor instructions. For Jenkins, upgrading to version 2.154 or later is recommended. Additionally, organizations may consider implementing configuration hardening and monitoring network controls to mitigate risks.
For comprehensive security assessments, organizations can engage in penetration testing to validate the effectiveness of remediation actions.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts, such as unusual access patterns or failures in expected methods. Behavioral anomalies in application performance could also indicate attempted exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2018-1000861 lies in its ability to highlight the potential dangers associated with deserialization vulnerabilities. This incident serves as a reminder for security teams to regularly review and enhance their security posture against such weaknesses.
To further strengthen defenses, organizations should consider adopting a comprehensive vulnerability management program and establish a robust incident response strategy.
Additionally, continuous engagement in penetration testing methodologies will assist in proactively identifying and mitigating security risks.
As organizations adopt new technologies, vigilance in monitoring for vulnerabilities such as CVE-2018-1000861 becomes essential to maintaining a secure environment.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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