CVE-2017-0374 in Config-Model
Summary
by MITRE
lib/Config/Model.pm in Config-Model (aka libconfig-model-perl) before 2.102 allows local users to gain privileges via a crafted model in the current working directory, related to use of . with the INC array.
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Analysis
by VulDB Data Team • 08/26/2025
The vulnerability identified as CVE-2017-0374 affects the Config-Model library for perl, specifically targeting versions prior to 2.102. This issue represents a privilege escalation vulnerability that exploits how the library handles model files in the current working directory. The flaw occurs within the lib/Config/Model.pm component where the software improperly processes model files when the current directory contains a maliciously crafted model file. The vulnerability stems from the library's use of the special "." entry in the perl INC array, which is a mechanism for specifying directories to search for modules and files. When a user executes a program that utilizes Config-Model and the current working directory contains a malicious model file, the library may inadvertently load and process this crafted file with elevated privileges. This behavior creates a path traversal and code execution scenario where local attackers can manipulate the library's behavior to execute arbitrary code with the privileges of the user running the affected application.
The technical exploitation of this vulnerability requires an attacker to place a malicious model file in the current working directory where a vulnerable application is executed. The perl INC array's "." entry allows the interpreter to search the current directory for modules, and when combined with the improper handling of model files in Config-Model, this creates an attack surface where local users can influence which model files are loaded. This vulnerability is classified as a local privilege escalation issue under CWE-264, which deals with permissions, privileges, and access controls. The flaw specifically relates to improper handling of file paths and module loading mechanisms, creating a situation where the application's security model is bypassed through manipulation of the local file system. The attack vector is particularly concerning because it does not require network access or remote exploitation, making it accessible to any local user who can influence the current working directory of a vulnerable application.
The operational impact of CVE-2017-0374 extends beyond simple privilege escalation to potentially enable more sophisticated attacks within a compromised system. When an application using Config-Model executes with elevated privileges, the malicious model file could be used to modify system configurations, install backdoors, or establish persistent access. The vulnerability is particularly dangerous in environments where applications using Config-Model run with elevated privileges or as system services. Attackers could leverage this flaw to compromise entire systems by exploiting applications that use Config-Model but do not properly sandbox or restrict their working directory. The implications align with ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation" and T1548.1, covering "Abuse Elevation Control Mechanism." Organizations running vulnerable applications should consider the potential for lateral movement and persistent access through this vulnerability, especially in environments where multiple applications may be using the same library.
Mitigation strategies for CVE-2017-0374 primarily focus on updating to version 2.102 or later of Config-Model, which contains the necessary patches to address the improper handling of model files in the current working directory. System administrators should also implement proper directory permissions and access controls to prevent unauthorized users from placing malicious files in directories where vulnerable applications execute. The use of application whitelisting and sandboxing techniques can help prevent the loading of unauthorized model files. Additionally, organizations should review their application deployment practices to ensure that vulnerable applications do not execute with unnecessary privileges and that the current working directory is properly controlled. Regular security audits should include verification of installed perl modules and their versions to identify and remediate similar vulnerabilities. The fix implemented in version 2.102 addresses the root cause by properly sanitizing file paths and ensuring that model files are loaded from expected locations rather than allowing arbitrary files in the current working directory to be processed.