CVE-2023-37272 in JS7
Summary
by MITRE • 07/14/2023
JS7 is an Open Source Job Scheduler. Users specify file names when uploading files holding user-generated documentation for JOC Cockpit. Specifically crafted file names allow an XSS attack to inject code that is executed with the browser. Risk of the vulnerability is considered high for branch 1.13 of JobScheduler (JS1). The vulnerability does not affect branch 2.x of JobScheduler (JS7) for releases after 2.1.0. The vulnerability is resolved with release 1.13.19.
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Analysis
by VulDB Data Team • 08/05/2023
The CVE-2023-37272 vulnerability affects JS7, an open source job scheduler system that provides automated workflow management and monitoring capabilities. This particular vulnerability resides within the JOC Cockpit component, which serves as the web-based user interface for managing job schedules and documentation. The system allows users to upload documentation files containing user-generated content, with the file naming mechanism being a critical point of failure in this security assessment. The vulnerability specifically targets the handling of user-supplied file names during the upload process, creating a potential attack vector that could compromise the integrity of the web interface.
The technical flaw manifests through improper input validation and sanitization of file names submitted by users during the documentation upload process. When maliciously crafted file names are provided, the system fails to adequately sanitize these inputs before processing them within the web interface context. This allows attackers to inject malicious javascript code directly into the file name parameter, which then gets executed in the browser context when the file name is displayed or processed by the JOC Cockpit interface. The vulnerability operates as a classic cross-site scripting attack, where the malicious payload is stored within the system and executed whenever the affected page is accessed, making it particularly dangerous for persistent exploitation.
The operational impact of this vulnerability is significant, particularly for systems running branch 1.13 of JobScheduler (JS1) where the risk is classified as high. Attackers could leverage this vulnerability to execute arbitrary javascript code in the context of authenticated users' browsers, potentially leading to session hijacking, data theft, privilege escalation, or further exploitation of the system. The attack surface is expanded since the vulnerability affects the web-based management interface, which is typically accessible to multiple users with varying levels of access rights. Organizations using the affected version could face unauthorized access to sensitive job scheduling information, potential disruption of automated workflows, and compromise of the entire job scheduling infrastructure. The vulnerability is especially concerning given that it affects the core management interface where users perform critical administrative tasks.
Mitigation strategies for this vulnerability include immediate deployment of the patched release 1.13.19 for branch 1.13 systems, which addresses the input sanitization issues in the file name handling mechanism. Organizations should also implement additional defensive measures such as input validation at multiple layers, including client-side and server-side sanitization of all user-supplied data. The implementation of Content Security Policy headers can provide additional protection against XSS attacks by restricting the sources from which scripts can be executed. Network segmentation and access controls should be reviewed to limit exposure of the JOC Cockpit interface to trusted users only. Security teams should monitor for any suspicious file upload activities and implement logging mechanisms to detect potential exploitation attempts. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and follows ATT&CK technique T1059.007 for script injection, emphasizing the importance of proper input validation and output encoding in web applications. Organizations should also consider implementing web application firewalls and regular security assessments to identify and remediate similar vulnerabilities in their job scheduling and automation systems.