CVE-2019-12135 in Papercut
Summary
by MITRE
An unspecified vulnerability in the application server in PaperCut MF and NG versions 18.3.8 and earlier and versions 19.0.3 and earlier allows remote attackers to execute arbitrary code via an unspecified vector.
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Analysis
by VulDB Data Team • 06/20/2020
The vulnerability identified as CVE-2019-12135 represents a critical remote code execution flaw within the PaperCut MF and NG application server software. This issue affects multiple versions of the software including 18.3.8 and earlier releases, as well as versions 19.0.3 and earlier, creating a substantial attack surface for malicious actors targeting organizations that rely on these printing and document management solutions. The vulnerability's classification as unspecified in the initial description suggests that the exact attack vector remains partially obscured, though the implications for remote code execution indicate a severe security weakness that could allow unauthorized individuals to gain complete control over affected systems.
The technical nature of this vulnerability places it within the domain of remote code execution exploits, which typically involve manipulating input validation mechanisms or authentication processes to inject and execute malicious code on target systems. The application server component in PaperCut software serves as a central hub for managing print jobs, user authentication, and system operations, making it an attractive target for attackers seeking persistent access to network environments. This vulnerability essentially allows remote attackers to bypass normal security controls and execute arbitrary commands with the privileges of the application server process, potentially leading to full system compromise and data exfiltration.
The operational impact of CVE-2019-12135 extends beyond simple unauthorized access, as successful exploitation could enable attackers to establish persistent backdoors, escalate privileges, and move laterally within network environments. Organizations utilizing PaperCut MF and NG systems face significant risk of data breaches, system corruption, and potential regulatory compliance violations when these vulnerable versions remain unpatched. The remote nature of the attack vector means that exploitation can occur from anywhere on the internet without requiring physical access or local network presence, making the vulnerability particularly dangerous for organizations with exposed application server endpoints. This type of vulnerability directly aligns with attack patterns documented in the mitre attack framework under the execution and privilege escalation domains, where adversaries seek to gain control over systems through remote access points.
Security professionals should prioritize immediate remediation efforts by updating to patched versions of PaperCut MF and NG software, as the vulnerability represents a high-severity threat that could be actively exploited in the wild. Organizations lacking automated patch management systems should implement manual verification processes to ensure all affected servers are properly updated, while also considering network segmentation and firewall rules to limit exposure of vulnerable application server components. The vulnerability's presence in both major version lines (18.3.x and 19.0.x) indicates a fundamental flaw in the software's architecture that required comprehensive patching across multiple release streams. This type of vulnerability is commonly associated with CWE-749 which describes exposed dangerous methods or interfaces, and may also relate to CWE-94 which covers improper control of generation of code, indicating potential code injection or execution flaws in the application server's processing logic.