CVE-2022-23107 in Warnings Next Generation Plugin
Summary
by MITRE • 01/12/2022
Jenkins Warnings Next Generation Plugin 9.10.2 and earlier does not restrict the name of a file when configuring custom ID, allowing attackers with Item/Configure permission to write and read specific files with a hard-coded suffix on the Jenkins controller file system.
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Analysis
by VulDB Data Team • 01/16/2022
The vulnerability identified as CVE-2022-23107 affects the Jenkins Warnings Next Generation Plugin version 9.10.2 and earlier, representing a critical security flaw that undermines the integrity of the Jenkins controller's file system. This issue stems from insufficient input validation within the plugin's configuration mechanism, specifically when handling custom ID names during the setup process. The flaw allows authenticated attackers who possess the Item/Configure permission to manipulate file operations on the Jenkins controller, potentially enabling unauthorized file access and modification.
The technical implementation of this vulnerability involves a hardcoded file suffix that is appended to user-provided filenames during the configuration process. When administrators configure custom IDs for warnings or other plugin features, the system accepts the provided filename without adequate sanitization or validation of the input. This oversight creates a path where malicious actors can specify filenames that, when combined with the hardcoded suffix, result in arbitrary file read and write operations on the controller's file system. The vulnerability essentially bypasses normal file system access controls by leveraging the plugin's configuration interface to execute file system operations that should otherwise be restricted.
From an operational perspective, this vulnerability poses significant risks to Jenkins environments as it allows attackers to potentially access sensitive configuration files, credentials stored in the Jenkins controller, or other critical system files. The impact extends beyond simple information disclosure, as the ability to write files provides opportunities for persistence mechanisms, code injection, or further escalation within the Jenkins infrastructure. Attackers could exploit this to place malicious files in strategic locations, potentially leading to full system compromise if the Jenkins controller runs with elevated privileges or has access to other system resources.
The vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, and represents a classic case of path traversal or directory traversal vulnerability. From an attack framework perspective, this flaw maps to multiple ATT&CK techniques including T1059 for command and scripting interpreter and T1566 for credential access, as attackers could leverage the file system access to extract credentials or establish persistence. The weakness also relates to T1078 for valid accounts, as the vulnerability requires only the Item/Configure permission which is often granted to developers or build engineers within standard Jenkins deployments.
Organizations should immediately upgrade to Jenkins Warnings Next Generation Plugin version 9.10.3 or later, which addresses this vulnerability through proper input validation and sanitization of filename parameters. Administrators should also implement additional mitigations including restricting the Item/Configure permission to only essential personnel, monitoring file system access patterns for suspicious activity, and conducting regular security audits of Jenkins configurations. The plugin's configuration interface should be reviewed to ensure no other similar path traversal vulnerabilities exist, and organizations should consider implementing network-level restrictions to limit access to Jenkins controller file systems where possible.