CVE-2012-5445 in Unified IP Phone
Summary
by MITRE
The kernel in Cisco Native Unix (CNU) on Cisco Unified IP Phone 7900 series devices (aka TNP phones) with software before 9.3.1-ES10 does not properly validate unspecified system calls, which allows attackers to execute arbitrary code or cause a denial of service (memory overwrite) via a crafted binary.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 12/29/2024
The vulnerability identified as CVE-2012-5445 affects the kernel component of Cisco Native Unix operating system running on Cisco Unified IP Phone 7900 series devices. This represents a critical security flaw that undermines the integrity of the underlying operating system by failing to properly validate system calls. The affected devices are specifically the TNP phones which utilize the Cisco Native Unix platform, a specialized operating environment designed for voice communication devices. The vulnerability manifests in devices running software versions prior to 9.3.1-ES10, indicating that Cisco had already addressed this issue in subsequent releases.
The technical nature of this flaw lies in the improper validation of unspecified system calls within the kernel layer. System calls serve as the interface between user-space applications and kernel-space operations, and their proper validation is essential for maintaining system security boundaries. When the kernel fails to validate these calls appropriately, it creates an exploitable condition where malicious inputs can bypass normal security checks. This particular vulnerability allows attackers to craft specific binary payloads that, when executed on the device, can either execute arbitrary code with elevated privileges or cause memory corruption leading to denial of service conditions. The memory overwrite aspect of this vulnerability aligns with common exploit patterns that target kernel memory management functions, potentially enabling privilege escalation attacks.
The operational impact of this vulnerability extends beyond simple device compromise, as it affects the fundamental communication infrastructure of enterprise networks. Cisco Unified IP Phone 7900 series devices serve as critical endpoints in voice communication systems, and their compromise could lead to unauthorized access to voice communications, disruption of business operations, or potential lateral movement within network environments. The ability to execute arbitrary code on these devices means attackers could establish persistent access points, install backdoors, or use the compromised devices as launching platforms for further attacks. The denial of service component creates additional risks where legitimate users could be denied access to voice communication services, potentially disrupting critical business operations. This vulnerability particularly affects organizations that rely heavily on IP-based voice communication systems and may be exploited by adversaries seeking to disrupt communications or gain unauthorized access to sensitive information.
Organizations should prioritize immediate remediation by upgrading affected devices to Cisco software version 9.3.1-ES10 or later, which contains the necessary patches to address the system call validation issues. Network segmentation strategies should be implemented to isolate voice communication devices from critical network segments, reducing potential attack surfaces. Security monitoring should include detection of unusual binary execution patterns or memory anomalies on voice devices. The vulnerability demonstrates weaknesses in the principle of least privilege and proper input validation that aligns with common attack patterns documented in the ATT&CK framework under privilege escalation and defense evasion techniques. Organizations should also consider implementing device integrity monitoring solutions that can detect unauthorized modifications to system binaries. This vulnerability serves as a reminder of the importance of maintaining up-to-date firmware on networked devices and the potential consequences of running outdated software in enterprise environments. The issue reflects broader concerns about embedded system security and the need for proper kernel security validation in specialized operating systems used in telecommunications infrastructure.