CVE-2017-12969 in IP Office Contact Center
Summary
by MITRE
Buffer overflow in the ViewerCtrlLib.ViewerCtrl ActiveX control in Avaya IP Office Contact Center before 10.1.1 allows remote attackers to cause a denial of service (heap corruption and crash) or execute arbitrary code via a long string to the open method.
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Analysis
by VulDB Data Team • 12/03/2025
The vulnerability identified as CVE-2017-12969 represents a critical buffer overflow flaw within the ViewerCtrlLib.ViewerCtrl ActiveX control component of Avaya IP Office Contact Center software. This particular vulnerability affects versions prior to 10.1.1 and demonstrates a classic heap-based buffer overflow condition that can be exploited through remote network access. The flaw specifically manifests when the open method of the ActiveX control receives an excessively long string input, creating a condition where memory boundaries are exceeded and potentially corrupting adjacent heap memory regions.
The technical implementation of this vulnerability stems from inadequate input validation within the ViewerCtrlLib.ViewerCtrl ActiveX control, which fails to properly bounds-check string parameters passed to its open method. This deficiency allows attackers to supply maliciously crafted input that exceeds the allocated buffer size, resulting in memory corruption that manifests as either application crashes or more severe heap corruption conditions. The vulnerability operates at the application layer and leverages the inherent trust model of ActiveX controls, which execute with elevated privileges when properly installed in web browsers or applications. This type of flaw directly corresponds to CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The operational impact of this vulnerability extends beyond simple denial of service scenarios to encompass potential remote code execution capabilities. When exploited successfully, attackers can cause heap corruption that may lead to arbitrary code execution within the context of the vulnerable application, potentially allowing full system compromise. The heap corruption occurs because the ActiveX control allocates a fixed-size buffer and fails to validate input length before copying data into this buffer, creating a predictable memory overwrite scenario. This vulnerability is particularly dangerous in enterprise environments where contact center applications handle sensitive customer data and may be exposed to untrusted network traffic.
Mitigation strategies for CVE-2017-12969 should prioritize immediate patch deployment to Avaya IP Office Contact Center versions 10.1.1 and later, which contain the necessary fixes for the buffer overflow condition. Network administrators should implement additional protective measures including disabling ActiveX controls in web browsers, implementing application whitelisting policies, and restricting network access to affected systems. The vulnerability aligns with several ATT&CK techniques including T1059 for command and scripting interpreter usage and T1203 for exploitation for privilege escalation. Organizations should also consider deploying intrusion detection systems to monitor for exploitation attempts and implement proper input validation controls at application boundaries to prevent similar issues in other components. The remediation process must include comprehensive testing of patched environments to ensure that the vulnerability has been fully addressed without introducing regressions in functionality.