CVE-2019-8948 in Papercut MF
Summary
by MITRE
PaperCut MF before 18.3.6 and PaperCut NG before 18.3.6 allow script injection via the user interface, aka PC-15163.
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Analysis
by VulDB Data Team • 05/11/2020
The vulnerability identified as CVE-2019-8948 represents a critical script injection flaw in PaperCut MF and PaperCut NG software versions prior to 18.3.6. This issue resides within the user interface components of the print management and workflow automation platform, which is widely deployed in enterprise environments for managing print jobs, user authentication, and resource allocation. The vulnerability stems from insufficient input validation and sanitization mechanisms that fail to properly filter malicious script content submitted through the graphical user interface elements. Attackers can exploit this weakness by injecting malicious scripts into form fields or configuration parameters that are subsequently processed and executed within the context of the user's browser session. The affected system architecture includes web-based administration interfaces, print job submission forms, and user management portals that handle untrusted input from end users. This vulnerability directly violates the principle of least privilege and input validation, creating a pathway for unauthorized code execution that can compromise the integrity of the entire print management infrastructure.
The technical exploitation of this vulnerability occurs through the manipulation of user interface elements that do not properly sanitize user-supplied data before rendering or processing it. When users interact with the web-based management console, malicious payloads can be injected into fields that accept text input, configuration parameters, or user identifiers. The script injection occurs at the point where user input is incorporated into dynamic web content without proper encoding or validation mechanisms. This flaw is particularly dangerous because it can be leveraged to execute arbitrary JavaScript code within the context of authenticated user sessions, potentially allowing attackers to escalate privileges, access sensitive administrative functions, or exfiltrate confidential data from the print management system. The vulnerability's impact is amplified by the fact that PaperCut systems are often integrated with corporate networks and may have elevated privileges for managing print resources and user access rights.
The operational consequences of this vulnerability extend beyond simple script execution to encompass broader security implications for enterprise print environments. Organizations utilizing affected PaperCut versions face potential unauthorized access to print queues, user credential exposure, and disruption of print services that could affect business operations. The vulnerability enables attackers to perform persistent modifications to print configurations, potentially creating backdoors for continued unauthorized access or launching further attacks against networked resources. Given that print management systems often contain sensitive information about user activities, document handling, and resource utilization, the compromise of such systems can lead to privacy violations and compliance breaches. The attack surface is particularly concerning in environments where PaperCut systems manage high-volume printing infrastructure, as these systems typically require elevated privileges and have access to multiple network resources. This vulnerability aligns with CWE-79, which describes cross-site scripting flaws, and represents a significant risk to the overall security posture of organizations relying on these print management solutions.
Organizations should immediately implement mitigations including updating to PaperCut MF and PaperCut NG versions 18.3.6 or later, which contain the necessary patches to address the script injection vulnerability. Network segmentation and access controls should be enforced to limit exposure of the print management interfaces to untrusted users, while regular security assessments should be conducted to identify similar vulnerabilities in other components of the print infrastructure. Input validation mechanisms should be enhanced to filter out potentially malicious content before processing user submissions, and security monitoring should be implemented to detect anomalous activities that may indicate exploitation attempts. The vulnerability's classification under ATT&CK technique T1059.007 for script injection highlights the need for comprehensive endpoint protection and web application firewalls to prevent exploitation. Additionally, organizations should conduct security awareness training for administrators to recognize potential signs of compromise and maintain regular vulnerability scanning processes to identify similar weaknesses in other systems that may be part of the print management ecosystem.