CVE-2018-0461 in IP Phone 8800
Summary
by MITRE
A vulnerability in the Cisco IP Phone 8800 Series Software could allow an unauthenticated, remote attacker to conduct an arbitrary script injection attack on an affected device. The vulnerability exists because the software running on an affected device insufficiently validates user-supplied data. An attacker could exploit this vulnerability by persuading a user to click a malicious link provided to the user or through the interface of an affected device. A successful exploit could allow an attacker to execute arbitrary script code in the context of the user interface or access sensitive system-based information, which under normal circumstances should be prohibited.
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Analysis
by VulDB Data Team • 06/26/2023
The vulnerability identified as CVE-2018-0461 affects Cisco IP Phone 8800 Series devices and represents a critical security flaw in the software implementation that permits unauthorized remote code execution through script injection techniques. This vulnerability resides within the web interface of the affected telephony devices, where insufficient input validation mechanisms fail to properly sanitize user-supplied data before processing. The flaw creates an environment where malicious actors can inject arbitrary scripts that execute within the context of the device's user interface, fundamentally compromising the security posture of enterprise communication systems. The vulnerability is particularly concerning because it requires no authentication credentials for exploitation, making it accessible to any remote attacker who can influence user behavior or access the device's web interface directly.
The technical exploitation of this vulnerability leverages cross-site scripting (XSS) attack vectors where an attacker crafts malicious links or inputs that, when processed by the vulnerable software, execute unintended code within the device's browser context. This occurs due to the software's failure to implement proper input sanitization and output encoding mechanisms that would normally prevent malicious scripts from being executed. The vulnerability's impact extends beyond simple script execution to include potential information disclosure, as attackers can access sensitive system-based information that should normally be restricted to authorized personnel. According to CWE classification, this vulnerability aligns with CWE-79: Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly neutralize input that is used in web page generation. The attack surface is particularly broad as it can be initiated through multiple vectors including phishing attacks where users are tricked into clicking malicious links, or through direct interface manipulation if the attacker has access to the device's web management interface.
The operational impact of CVE-2018-0461 in enterprise environments is substantial, as compromised IP phones can serve as entry points for broader network attacks or provide attackers with persistent access to corporate communication infrastructure. Attackers could potentially use the compromised devices as pivoting points to access other network segments, escalate privileges, or conduct man-in-the-middle attacks against voice communications. The vulnerability undermines the fundamental security assumptions of enterprise telephony systems where devices are expected to operate in isolation from external threats. From an ATT&CK framework perspective, this vulnerability maps to T1059.007: Command and Scripting Interpreter: JavaScript, as it enables execution of malicious JavaScript code within the device's browser context. Additionally, it supports T1071.004: Application Layer Protocol: DNS, if attackers use the compromised devices to establish command and control communications or to perform DNS tunneling. The risk is compounded by the fact that IP phones are often deployed in mission-critical communication environments where the compromise of even a single device can severely impact business continuity and security operations.
Organizations should implement immediate mitigations including applying Cisco's official security patches and updates, implementing network segmentation to isolate telephony infrastructure, and deploying web application firewalls to filter malicious traffic. Device administrators should also configure strict access controls and disable unnecessary web interface functionality where possible. The vulnerability highlights the importance of proper input validation and output encoding in web applications, emphasizing the need for comprehensive security testing during the development lifecycle. Regular security assessments of telephony infrastructure are essential to identify similar vulnerabilities that may exist in other networked devices. Network monitoring should be enhanced to detect anomalous traffic patterns that might indicate exploitation attempts, and incident response procedures should be updated to address potential compromises of communication devices. The vulnerability serves as a reminder of the critical importance of securing all network endpoints, including specialized communication devices that may not receive the same level of security attention as traditional computing systems.