CVE-2023-27350 is a critical vulnerability that allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SetupCompleted class and results from improper access control. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of SYSTEM.
With a CVSS score of 9.8, the severity of this vulnerability is significant. Organizations running vulnerable versions of PaperCut should be aware that the risk is profound, as attackers may exploit this flaw without needing any prior authentication, leading to unauthorized access and potential system takeover.
Given the exploitation status, organizations should prioritize patching immediately. This vulnerability has been identified in the Known Exploited Vulnerabilities (KEV) catalog, indicating that active exploitation has been observed in the wild.
The urgency for defenders cannot be overstated. Organizations must take immediate action to mitigate this threat by applying available patches and updates as per vendor instructions.
Vulnerability Details
This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). The issue arises from improper access control within the SetupCompleted class. Attackers can exploit this flaw to execute arbitrary code in the context of SYSTEM.
The CVSS score for this vulnerability is 9.8, classifying it as critical. The attack vector is network-based with low complexity, requiring no privileges or user interaction. The impact on confidentiality, integrity, and availability is all rated as high, indicating severe potential consequences.
The vulnerability affects multiple versions of PaperCut MF and NG, specifically those prior to version 20.1.7, between versions 21.0.0 and 21.2.11, and from 22.0.0 to 22.0.9.
Technical Analysis
The root cause of CVE-2023-27350 is improper access control in the SetupCompleted class of PaperCut, allowing unauthorized access to the system. The attack vector is network-based, meaning that an attacker can exploit this vulnerability remotely. The complexity of the attack is low, as no special privileges or user interaction are required.
The confidentiality impact is high, as attackers can gain access to sensitive data. Integrity is also compromised, allowing attackers to alter data or configurations. Additionally, the availability of the system can be affected, leading to potential downtime or loss of functionality.
Risk & Impact Analysis
Organizations using PaperCut should consider the real-world deployment risk associated with this vulnerability. The ability for attackers to bypass authentication and execute arbitrary code poses severe risks, including unauthorized access to sensitive documents and the potential for widespread exploitation.
The blast radius for this vulnerability is significant, especially for organizations relying on PaperCut for managing print services. The urgency assessment based on the CVSS score and the fact that this vulnerability is included in the KEV catalog indicates that organizations should take immediate action to mitigate risk.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | Yes |
Affected Versions
The affected versions of PaperCut include all versions prior to vendor patch, specifically:
• PaperCut MF: versions 8.0 to 20.1.7, 21.0.0 to 21.2.11, and 22.0.0 to 22.0.9 • PaperCut NG: versions 8.0 to 20.1.7, 21.0.0 to 21.2.11, and 22.0.0 to 22.0.9
Mitigation & Remediation
Organizations should prioritize applying updates as per vendor instructions to mitigate this vulnerability. For more detailed guidance on securing PaperCut installations, refer to the vendor's recommendations.
Additionally, organizations may consider implementing network controls, monitoring for unusual behavior, and ensuring configuration hardening to reduce potential attack surfaces.
Penetration testing should also be considered to validate security measures.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual authentication behaviors, including unauthorized access attempts. Behavioral anomalies indicative of unauthorized code execution should also be flagged.
Network signatures associated with PaperCut services should be analyzed for signs of compromise, and system changes that deviate from the norm should be investigated.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-27350 lies in its demonstration of the critical need for robust access control mechanisms in software. This vulnerability represents a pattern of improper security practices that can lead to severe consequences if not addressed.
Security teams should take this opportunity to reassess their security posture, ensuring that access controls are properly implemented and regularly tested. The lessons learned from vulnerabilities like CVE-2023-27350 underscore the importance of proactive security measures.
Organizations are encouraged to engage in ongoing security assessments, including comprehensive vulnerability management programs and incident response planning to ensure they are prepared for potential future threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)