CVE-2019-10355 in Script Security Plugin
Summary
by MITRE
A sandbox bypass vulnerability in Jenkins Script Security Plugin 1.61 and earlier related to the handling of type casts allowed attackers to execute arbitrary code in sandboxed scripts.
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Analysis
by VulDB Data Team • 11/14/2023
The vulnerability identified as CVE-2019-10355 represents a critical sandbox bypass flaw within the Jenkins Script Security Plugin affecting versions 1.61 and earlier. This issue specifically targets the plugin's handling of type casts within sandboxed script execution environments, creating a pathway for malicious actors to circumvent security controls that are meant to isolate potentially dangerous code operations. The vulnerability exists in the core logic that governs how Jenkins processes type casting operations within its security framework, allowing attackers to exploit weaknesses in the type validation mechanisms that should prevent arbitrary code execution.
The technical exploitation of this vulnerability occurs through carefully crafted script content that leverages type cast operations to manipulate the security boundaries of the sandbox environment. When Jenkins processes scripts containing specific type casting patterns, the plugin fails to properly validate or restrict these operations, enabling attackers to inject code that bypasses the intended security constraints. This flaw operates at the intersection of Java's type system and Jenkins' security model, where the type cast handling logic does not adequately account for potential code injection vectors that could be exploited through legitimate but improperly validated type conversion operations.
The operational impact of CVE-2019-10355 extends beyond simple privilege escalation to encompass full system compromise capabilities. Attackers who successfully exploit this vulnerability can execute arbitrary code within the Jenkins server environment, potentially gaining access to build artifacts, credentials, and other sensitive information stored within the system. The vulnerability particularly affects organizations that rely heavily on Jenkins for continuous integration and deployment processes, where compromised build servers could lead to supply chain attacks, data breaches, or unauthorized access to source code repositories. The sandbox bypass nature means that even scripts that should be restricted from accessing system resources can gain elevated privileges through this vector.
Organizations should prioritize immediate remediation by upgrading the Jenkins Script Security Plugin to version 1.62 or later, which contains the necessary patches to address the type cast handling logic. Security teams should also implement additional monitoring and logging of script execution activities within Jenkins environments to detect potential exploitation attempts. The vulnerability aligns with CWE-252, which addresses "Unchecked Return Value" and related security issues in sandbox environments, and maps to ATT&CK technique T1059.007 for "Command and Scripting Interpreter: JavaScript" as attackers may leverage JavaScript within Jenkins pipelines to exploit the sandbox bypass. Additionally, organizations should review their Jenkins security configurations and implement principle of least privilege access controls to minimize potential damage from successful exploitation attempts.