CVE-2019-10380 in Simple Travis Pipeline Runner Plugin
Summary
by MITRE
Jenkins Simple Travis Pipeline Runner Plugin 1.0 and earlier specifies unsafe values in its custom Script Security whitelist, allowing attackers able to execute Script Security protected scripts to execute arbitrary code.
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Analysis
by VulDB Data Team • 07/22/2020
The vulnerability identified as CVE-2019-10380 affects the Jenkins Simple Travis Pipeline Runner Plugin version 1.0 and earlier, representing a critical security flaw that exploits unsafe script security configurations within the Jenkins continuous integration platform. This vulnerability resides in the plugin's implementation of Script Security whitelist mechanisms, which are designed to prevent unauthorized code execution within the Jenkins environment. The flaw allows attackers who have already gained the ability to execute scripts under Script Security protection to escalate their privileges and achieve arbitrary code execution on the Jenkins server. This represents a significant escalation from a standard script execution capability to full system compromise, as the plugin's unsafe whitelist configuration bypasses the intended security boundaries that protect against malicious script injection.
The technical implementation of this vulnerability stems from the plugin's failure to properly validate or restrict the script security whitelist entries it establishes. When Jenkins processes pipeline scripts through this plugin, it relies on the Script Security framework to prevent execution of potentially harmful code patterns. However, the Simple Travis Pipeline Runner Plugin 1.0 and earlier versions include unsafe whitelist entries that permit execution of dangerous methods or classes that should normally be restricted. This misconfiguration effectively creates a backdoor within the security model, allowing attackers who can inject scripts into the pipeline execution environment to leverage these overly permissive whitelist entries to execute arbitrary commands with the privileges of the Jenkins service account.
The operational impact of CVE-2019-10380 extends beyond simple code execution to encompass complete system compromise and potential lateral movement within network environments. Jenkins servers typically run with elevated privileges to perform build operations, deploy applications, and interact with various system resources. When an attacker can leverage this vulnerability, they gain the ability to execute commands that could include data exfiltration, system reconnaissance, privilege escalation to other network services, or even deployment of additional malicious tools. The vulnerability is particularly dangerous because it requires minimal initial access to achieve maximum impact, as attackers only need the ability to execute scripts within the Script Security protected environment to exploit the flaw. This makes the vulnerability particularly attractive to threat actors who may have gained access through other attack vectors such as credential compromise or web application vulnerabilities.
Organizations affected by this vulnerability should immediately implement mitigations including updating to the patched version of the Simple Travis Pipeline Runner Plugin, which addresses the unsafe whitelist configuration. The remediation process should also include reviewing existing pipeline configurations to ensure no malicious scripts have been executed and monitoring system logs for suspicious activity. Security teams should also consider implementing additional controls such as restricting plugin installation privileges, implementing more granular script security policies, and conducting regular security audits of Jenkins configurations. From a compliance perspective, this vulnerability aligns with CWE-254 security weaknesses related to inadequate script security and could be classified under ATT&CK technique T1059 for command and scripting interpreter, as it enables execution of arbitrary commands through script injection mechanisms. The vulnerability demonstrates the critical importance of proper security configuration management and the principle of least privilege in CI/CD environments where automated systems have elevated system access rights.