CVE-2022-1359 in cnMaestro
Summary
by MITRE • 05/18/2022
The affected On-Premise cnMaestro is vulnerable to an arbitrary file-write through improper limitation of a pathname to a restricted directory inside a specific route. If an attacker supplied path traversal charters (../) as part of a filename, the server will save the file where the attacker chooses. This could allow an attacker to write any data to any file in the server.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 05/25/2022
The vulnerability identified as CVE-2022-1359 affects the on-premise cnMaestro system, representing a critical path traversal flaw that enables unauthorized file manipulation within the affected environment. This weakness resides within a specific route handling mechanism where the system fails to properly validate and sanitize user-supplied file paths, creating an avenue for attackers to bypass normal file system access controls. The vulnerability manifests when the application processes file names that contain directory traversal sequences, specifically the "../" characters, which should normally be restricted or filtered to prevent access outside designated directories. This flaw directly maps to CWE-22, known as "Improper Limitation of a Pathname to a Restricted Directory," which is classified as a path traversal vulnerability that allows attackers to access files and directories outside the intended scope. The implications extend beyond simple file access, as the vulnerability permits attackers to write arbitrary data to any location within the server's file system, potentially enabling complete system compromise.
The technical exploitation of this vulnerability occurs through a carefully crafted file upload or processing request that includes path traversal sequences in the filename parameter. When the cnMaestro server processes such input without proper validation, it interprets the traversal characters as legitimate path navigation commands, allowing the attacker to specify absolute paths or navigate to arbitrary directories within the server's file system. This behavior violates fundamental security principles of least privilege and proper input validation, as the system fails to implement adequate sanitization of user-provided data before using it in file system operations. The vulnerability essentially removes the boundary checks that should normally prevent access to restricted directories, enabling attackers to write malicious files to critical system locations such as configuration files, executable binaries, or system directories. From an operational perspective, this vulnerability creates a significant risk of privilege escalation and persistent backdoor establishment within the targeted environment.
The operational impact of CVE-2022-1359 extends far beyond simple data compromise, as it provides attackers with the capability to fundamentally alter the system's behavior and potentially gain complete control over the affected cnMaestro instance. Attackers could leverage this vulnerability to upload malicious executables, modify system configurations, or establish persistent access points that would allow continued unauthorized access even after initial exploitation. The vulnerability's severity is amplified by the fact that it operates at the file system level, potentially enabling attackers to modify or replace critical system components, inject malicious code into legitimate processes, or manipulate the application's core functionality. Organizations utilizing on-premise cnMaestro deployments face significant risk of data breaches, service disruption, and potential lateral movement within their networks if this vulnerability remains unaddressed. The attack vector aligns with techniques documented in the MITRE ATT&CK framework under the T1059.007 sub-technique for "Command and Scripting Interpreter: PowerShell" and T1078.004 for "Valid Accounts: Cloud Accounts," as attackers could use this vulnerability to establish persistent access and maintain control over compromised systems.
Mitigation strategies for CVE-2022-1359 should focus on implementing robust input validation and sanitization mechanisms that prevent path traversal sequences from being processed as legitimate file paths. Organizations must ensure that all user-supplied file names are properly validated, normalized, and restricted to predefined directories before any file system operations occur. This includes implementing strict path validation that rejects or removes directory traversal sequences, enforcing proper access controls and file system permissions, and regularly auditing file system access patterns to detect anomalous behavior. Security measures should also include implementing web application firewalls that can detect and block suspicious path traversal attempts, conducting regular security assessments of file handling routines, and ensuring that all cnMaestro instances are updated with the latest security patches provided by the vendor. Additionally, organizations should implement network segmentation and monitoring solutions that can detect unauthorized file system modifications and provide alerts when suspicious file operations occur within the cnMaestro environment. The vulnerability underscores the critical importance of proper input validation and access control implementation in preventing path traversal attacks that can lead to complete system compromise.