CVE-2026-82778 in CONPROSYS PAC Series
Summary
by MITRE • 09/14/2026
An exposure of information through directory listing issue exists in CONPROSYS PAC Series. Accessing a specific URL on this product may allow a remote unauthenticated attacker to obtain the directory list without authentication.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability identified within the CONPROSYS PAC Series represents a critical configuration error known as an exposure of information through directory listing, formally categorized under CWE-548 in the Common Weakness Enumeration standard. This flaw arises when the web server or application hosting interface is misconfigured to allow automatic generation and display of file system directories without requiring prior authentication or authorization checks. In a properly secured environment, access to sensitive administrative files, configuration backups, source code snippets, or internal documentation should be strictly gated behind robust identity verification mechanisms. However, in this specific instance, the absence of such controls allows any entity with network connectivity to the target device to enumerate its underlying file structure simply by navigating to specific URLs that correspond to directory paths on the server.
From a technical perspective, this issue typically stems from default configurations left unchanged during installation or maintenance phases, where administrators fail to disable index generation features provided by web servers such as Apache, Nginx, or embedded HTTP services common in industrial control systems. When an unauthenticated remote attacker accesses these exposed directories, they can retrieve a comprehensive list of files and subdirectories present on the system. This capability transforms what might seem like a minor informational leak into a significant reconnaissance vector. The attacker gains visibility into the internal architecture of the device, including file naming conventions, version identifiers embedded in filenames, backup locations, and potentially sensitive configuration files that may contain hardcoded credentials or network topology details.
The operational impact of this vulnerability is substantial within the context of industrial automation environments where CONPROSYS PAC devices are deployed. By obtaining a directory listing, an attacker can identify high-value targets for further exploitation. For example, they might locate database dumps containing user passwords, configuration files with IP addresses and port numbers that reveal network segmentation details, or executable binaries that could be analyzed for additional weaknesses such as buffer overflows or command injection flaws. This phase of attack aligns closely with the ATT&CK technique T1083, which covers File and Directory Discovery, a critical step in the kill chain leading to privilege escalation and lateral movement within an OT network. The exposure effectively lowers the barrier to entry for attackers who previously lacked insight into the target's internal structure, thereby facilitating more targeted and successful subsequent attacks.
Mitigation strategies must focus on immediate remediation of the web server configuration alongside long-term security hardening practices. Administrators should immediately disable directory listing features in the HTTP service running on the PAC device. This often involves modifying specific directives such as Options -Indexes in Apache configurations or autoindex off in Nginx settings, depending on the underlying software stack used by CONPROSYS. Furthermore, it is imperative to enforce strict access controls so that all administrative interfaces and file retrieval endpoints require valid authentication credentials before any content is served. Regular security audits should be conducted to ensure that default configurations have not been inadvertently restored or modified incorrectly during updates. Additionally, implementing network-level segmentation can limit the blast radius by ensuring that only authorized management stations can reach these services, thereby reducing the attack surface available to remote unauthenticated actors.