CVE-2025-59181 in Packet Core Controller
Summary
by MITRE • 07/27/2026
Ericsson Packet Core Controller (PCC) versions prior to 1.39 contain a directory traversal vulnerability in Configuration Management that could allow an attacker to change directory permissions, denying access to legitimate users.
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Analysis
by VulDB Data Team • 07/27/2026
The Ericsson Packet Core Controller represents a critical component within telecommunications infrastructure responsible for managing network configuration and control functions. This particular vulnerability affects versions prior to 1.39 and resides within the Configuration Management module of the system. The flaw manifests as a directory traversal issue that fundamentally undermines the integrity of file system access controls. Such vulnerabilities are particularly dangerous in network infrastructure components where unauthorized modification of system files could lead to complete system compromise.
The technical implementation of this vulnerability stems from insufficient input validation and improper path resolution within the configuration management interface. Attackers can exploit this weakness by crafting malicious requests that manipulate directory traversal sequences, allowing them to navigate beyond intended file system boundaries. This flaw aligns with common software security weaknesses categorized under CWE-22, which specifically addresses directory traversal or path traversal vulnerabilities in software systems. The vulnerability enables attackers to modify directory permissions through carefully constructed input that bypasses normal access controls and authentication mechanisms.
Operationally, the impact of this vulnerability extends beyond simple unauthorized file access to encompass complete denial of service scenarios for legitimate users. When an attacker successfully exploits this weakness, they can alter permission settings on critical system directories, effectively locking out authorized administrators and users from accessing essential configuration files and system resources. This creates a cascading effect where normal network operations become disrupted as the system loses its ability to maintain proper access controls. The vulnerability particularly affects environments where multiple administrators or automated systems rely on consistent directory permissions for operational continuity.
The exploitation of this vulnerability follows patterns consistent with ATT&CK technique T1078 which covers valid accounts and legitimate credentials usage for persistence and privilege escalation. In this case, the attacker leverages legitimate system access points to manipulate file system permissions rather than attempting direct credential compromise. Organizations should implement immediate mitigations including applying the vendor-provided patches for versions 1.39 and later, implementing network segmentation to limit access to the affected configuration management interfaces, and conducting thorough audit of directory permissions across all system components. Additional defensive measures include deploying web application firewalls that can detect and block suspicious path traversal patterns, establishing robust monitoring for unauthorized permission changes, and ensuring proper least privilege access controls are maintained throughout the network infrastructure.
This vulnerability demonstrates the critical importance of input validation in network management systems where configuration changes directly impact system security posture. The flaw represents a fundamental breakdown in the principle of least privilege enforcement within the system's access control mechanisms. Organizations should also consider implementing automated vulnerability scanning tools that can detect similar path traversal issues across their entire telecommunications infrastructure to prevent exploitation of related weaknesses. Regular security assessments and penetration testing should include specific checks for directory traversal vulnerabilities in all network management interfaces to ensure comprehensive protection against such attacks.
The remediation approach requires careful coordination between network operations teams and security personnel to ensure patch deployment does not disrupt ongoing network services while maintaining system availability. The affected versions prior to 1.39 should be immediately upgraded to the patched releases, with proper change management processes implemented during the upgrade cycle. System administrators must also review existing access controls and permission settings to identify any potential compromise that may have occurred during the vulnerability window. Long-term security posture improvements should include regular security training for system administrators on secure coding practices and the implementation of automated security scanning tools that can continuously monitor for similar vulnerabilities across the telecommunications infrastructure ecosystem.