CVE-2012-5409 in SiPass integrated
Summary
by MITRE
AscoServer.exe in the server in Siemens SiPass integrated MP2.6 and earlier does not properly handle IOCP RPC messages received over an Ethernet network, which allows remote attackers to write data to any memory location and consequently execute arbitrary code via crafted messages, as demonstrated by an arbitrary pointer dereference attack or a buffer overflow attack.
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Analysis
by VulDB Data Team • 08/02/2025
The vulnerability identified as CVE-2012-5409 affects Siemens SiPass integrated MP2.6 and earlier versions, specifically targeting the AscoServer.exe component within the server architecture. This critical flaw resides in the handling of IOCP RPC messages transmitted over Ethernet networks, representing a fundamental security weakness in the industrial access control system's communication protocols. The vulnerability manifests when the system fails to properly validate and process incoming RPC messages, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized control over the affected system. The flaw operates at the network communication layer, where the server's RPC processing mechanism becomes susceptible to malformed input that can be crafted to manipulate memory operations.
The technical implementation of this vulnerability stems from improper input validation within the AscoServer.exe process, which processes IOCP RPC messages through Ethernet connections. When maliciously crafted RPC messages are received, the system's memory management routines fail to properly sanitize the input data, leading to potential pointer dereference operations that can target arbitrary memory addresses. This memory corruption vulnerability enables attackers to write data to any memory location within the server's address space, fundamentally compromising the system's integrity and allowing for arbitrary code execution. The vulnerability specifically relates to buffer overflow conditions and improper memory access patterns that are commonly classified under CWE-121, which deals with stack-based buffer overflow conditions, and CWE-787, which addresses out-of-bounds write vulnerabilities.
The operational impact of CVE-2012-5409 extends far beyond typical network security concerns, as it directly affects industrial control systems that manage physical security infrastructure. Remote exploitation of this vulnerability allows attackers to gain complete control over the SiPass integrated MP2.6 system, potentially enabling them to manipulate access control permissions, disable security measures, or even gain physical access to secured facilities. The attack vector requires only network connectivity to the affected system, making it particularly dangerous as it can be exploited from remote locations without physical access. This vulnerability represents a significant risk to industrial environments where access control systems are critical for security operations, potentially allowing adversaries to establish persistent access points within secure facilities.
The exploitation of this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to remote code execution and privilege escalation. Attackers can leverage this flaw to establish a foothold within industrial networks, potentially using it as a stepping stone for further infiltration of connected systems. The vulnerability's classification as a remote code execution flaw falls under ATT&CK technique T1203, which encompasses exploitation of remote services, and T1059, which covers execution through command and scripting interpreters. Organizations using Siemens SiPass integrated MP2.6 systems face significant operational risks as this vulnerability can be exploited without requiring specialized knowledge of the target system's internal architecture, making it an attractive target for both sophisticated and less experienced attackers.
Mitigation strategies for CVE-2012-5409 should prioritize immediate system updates and patches from Siemens, as the vendor has likely released security fixes for this vulnerability. Network segmentation and firewall rules should be implemented to restrict access to the affected system, limiting the attack surface and preventing unauthorized network access. Regular security monitoring and intrusion detection systems should be configured to detect anomalous RPC traffic patterns that might indicate exploitation attempts. Additionally, organizations should conduct comprehensive vulnerability assessments of their industrial control systems to identify similar vulnerabilities in other components of their security infrastructure. The implementation of network access controls and regular security audits becomes critical in preventing exploitation of this type of vulnerability, which can have severe consequences for physical security operations and industrial safety protocols.