CVE-2023-6006 in PaperCut
Summary
by MITRE • 11/14/2023
This vulnerability allows local attackers to escalate privileges on affected installations of PaperCut NG. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the pc-pdl-to-image process. The process loads an executable from an unsecured location. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
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Analysis
by VulDB Data Team • 09/26/2024
The vulnerability identified as CVE-2023-6006 represents a critical privilege escalation flaw within PaperCut NG software installations, specifically targeting the pc-pdl-to-image process component. This vulnerability operates under the principle of insecure direct object reference and improper privilege management, creating a pathway for local attackers to elevate their privileges from low-privileged user contexts to SYSTEM level access. The flaw manifests in the process's improper handling of executable loading mechanisms, where the system fails to validate or secure the source location from which executables are loaded, thereby creating an attack surface that directly violates security best practices established by the Open Web Application Security Project and the Center for Internet Security.
The technical implementation of this vulnerability stems from the pc-pdl-to-image process's reliance on unsecured executable loading procedures that do not properly validate the integrity or origin of loaded binaries. This process operates with elevated privileges to perform its core function but fails to implement proper access controls or validation mechanisms when determining which executables to load and execute. The vulnerability directly maps to CWE-732 - Incorrect Permission Assignment for Critical Resource, where the system grants excessive privileges to a process that should operate with restricted permissions. Attackers can exploit this by placing malicious executables in the unsecured locations that the process accesses, effectively bypassing normal privilege boundaries and gaining SYSTEM-level access through legitimate system processes.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete system control and the ability to execute arbitrary code with the highest possible privileges. This creates a comprehensive compromise scenario where attackers can modify system files, install backdoors, exfiltrate sensitive data, or establish persistent access to the compromised system. The vulnerability's local attack requirement means that attackers must first gain initial access to the system, but once achieved, the privilege escalation capability provides a powerful foothold for further exploitation. This aligns with ATT&CK technique T1068 - Exploitation for Privilege Escalation, where attackers leverage system vulnerabilities to gain elevated privileges, and T1059 - Command and Scripting Interpreter, as the compromised process can be leveraged to execute malicious commands.
Mitigation strategies for CVE-2023-6006 should focus on implementing proper privilege separation and secure executable loading mechanisms. Organizations should immediately apply vendor-provided patches or updates that address the insecure executable loading behavior in the pc-pdl-to-image process. Additionally, implementing proper file system permissions and access controls can help prevent unauthorized modifications to critical system directories. The mitigation approach should include regular security audits of process privilege assignments and implementation of principle of least privilege principles. Network segmentation and monitoring solutions should be deployed to detect unusual process execution patterns or attempts to load unauthorized executables. The vulnerability's characteristics also suggest implementing application whitelisting policies and mandatory access controls to prevent unauthorized code execution, aligning with security frameworks such as NIST SP 800-53 and ISO 27001 controls for privilege management and access control.