CVE-2019-10293 in Kmap Plugin
Summary
by MITRE
A missing permission check in Jenkins Kmap Plugin in KmapJenkinsBuilder.DescriptorImpl form validation methods allows attackers with Overall/Read permission to initiate a connection to an attacker-specified server.
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Analysis
by VulDB Data Team • 08/25/2023
The vulnerability identified as CVE-2019-10293 resides within the Jenkins Kmap Plugin, specifically within the KmapJenkinsBuilder.DescriptorImpl form validation methods where a critical missing permission check has been discovered. This flaw represents a significant security weakness that undermines the plugin's access control mechanisms and potentially exposes Jenkins environments to unauthorized network connections initiated by malicious actors. The vulnerability manifests when attackers with only Overall/Read permission levels can exploit the insufficient validation to establish connections to arbitrary servers specified by the attacker, creating a pathway for unauthorized network communication that bypasses normal Jenkins security boundaries.
This technical flaw fundamentally compromises the principle of least privilege by allowing read-only authenticated users to perform network operations that should require elevated permissions. The missing permission check occurs during form validation processes where the plugin fails to verify whether the requesting user possesses the necessary authorization levels to initiate outbound network connections. According to CWE classification, this vulnerability maps to CWE-284: Improper Access Control, which specifically addresses inadequate access control mechanisms that allow unauthorized users to perform privileged operations. The vulnerability's impact extends beyond simple information disclosure as it enables potential data exfiltration, command and control communication, or further exploitation of the Jenkins environment through the established network connections.
The operational impact of CVE-2019-10293 is substantial for Jenkins administrators and security teams managing continuous integration environments. Attackers can leverage this vulnerability to connect to malicious servers, potentially establishing persistent communication channels for data exfiltration or command execution. This weakness creates a vector for attackers to expand their foothold within the Jenkins infrastructure, as the compromised system can be used to communicate with external malicious actors. The vulnerability also aligns with ATT&CK technique T1071.004: Application Layer Protocol: DNS, where attackers might use the plugin to establish unauthorized DNS connections or other network protocols to bypass network security controls. Organizations using Jenkins with the Kmap plugin are at risk of having their build environments compromised, potentially leading to supply chain attacks or unauthorized access to source code repositories and build artifacts.
Mitigation strategies for this vulnerability should begin with immediate patching of the Kmap plugin to the latest version that addresses the missing permission check. Administrators should also implement network segmentation and firewall rules to restrict outbound connections from Jenkins servers, particularly limiting access to known good external endpoints. The principle of least privilege should be enforced by carefully reviewing and limiting user permissions within Jenkins, ensuring that users with Overall/Read access cannot initiate arbitrary network connections. Additionally, monitoring and logging of network connections from Jenkins instances should be enhanced to detect suspicious outbound communications that might indicate exploitation attempts. Security teams should also consider implementing automated vulnerability scanning tools that can identify unpatched Jenkins plugins and other vulnerable components within their infrastructure. Regular security assessments and penetration testing should be conducted to verify that access controls are properly enforced and that no similar permission bypass vulnerabilities exist within the Jenkins environment or its associated plugins.