CVE-2012-4705 in CODESYS Gateway-Server
Summary
by MITRE
Directory traversal vulnerability in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to execute arbitrary code via vectors involving a crafted pathname.
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Analysis
by VulDB Data Team • 08/10/2025
The CVE-2012-4705 vulnerability represents a critical directory traversal flaw in the 3S CODESYS Gateway-Server software version 2.3.9.27 and earlier. This vulnerability resides in the server's handling of file paths and allows remote attackers to manipulate the application's file system access mechanisms. The flaw enables malicious actors to navigate beyond the intended directory boundaries and access restricted files or execute arbitrary code on the target system. The vulnerability specifically affects the server's pathname processing logic, where insufficient input validation permits attackers to craft malicious file paths that bypass normal security controls.
The technical implementation of this vulnerability stems from inadequate sanitization of user-supplied input within the Gateway-Server's file handling routines. When the server processes requests containing crafted pathnames, it fails to properly validate or sanitize the input before using it in file system operations. This weakness creates a path traversal condition where attackers can manipulate directory navigation sequences such as "../" or similar constructs to access files outside the designated application directories. The vulnerability can be exploited through network-based attacks without requiring authentication, making it particularly dangerous in environments where the server is exposed to untrusted networks. The flaw aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal vulnerabilities.
The operational impact of CVE-2012-4705 extends beyond simple file access violations and can lead to complete system compromise. Remote attackers exploiting this vulnerability can potentially read sensitive configuration files, system binaries, or other critical data that should remain protected. The ability to execute arbitrary code on the target system provides attackers with full control over the affected server, enabling them to install backdoors, modify system configurations, or establish persistent access. In industrial control systems environments where CODESYS Gateway-Server is commonly deployed, this vulnerability poses significant risks to operational technology infrastructure, potentially disrupting critical processes or enabling attackers to gain unauthorized access to physical control systems. The vulnerability's impact is further amplified by its remote exploitability, meaning attackers do not need physical access to the system to carry out successful attacks.
Organizations should implement immediate mitigations including updating to version 2.3.9.27 or later of the 3S CODESYS Gateway-Server software, which contains the necessary patches to address the directory traversal vulnerability. Network segmentation and access controls should be enforced to limit exposure of the affected server to untrusted networks. Implementing proper input validation mechanisms and restricting file system access permissions can provide additional defense-in-depth measures. Security monitoring should be enhanced to detect unusual file access patterns or attempts to traverse directory structures that may indicate exploitation attempts. The vulnerability's characteristics align with tactics described in the ATT&CK framework under privilege escalation and defense evasion techniques, where attackers leverage path traversal vulnerabilities to gain unauthorized access and maintain persistent presence on compromised systems. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other components of industrial control system environments.