CVE-2007-4582 in NVR Server
Summary
by MITRE
Buffer overflow in the nvUnifiedControl.AUnifiedControl.1 ActiveX control in nvUnifiedControl.dll 1.1.45.0 in ACTi Network Video Recorder (NVR) SP2 2.0 allows remote attackers to execute arbitrary code via a long second argument to the SetText method.
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Analysis
by VulDB Data Team • 10/01/2024
The vulnerability identified as CVE-2007-4582 represents a critical buffer overflow flaw within the ACTi Network Video Recorder SP2 2.0 system, specifically within the nvUnifiedControl.AUnifiedControl.1 ActiveX control component. This issue exists in the nvUnifiedControl.dll version 1.1.45.0 and manifests through improper input validation in the SetText method implementation. The vulnerability stems from the lack of adequate bounds checking when processing user-supplied data, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized code execution privileges. The ActiveX control architecture inherently introduces additional attack surface considerations as it operates within web browser environments where user input can be directly manipulated to trigger malicious behavior.
The technical implementation of this buffer overflow occurs when the SetText method receives a second argument that exceeds the allocated buffer size within the nvUnifiedControl.dll component. This particular flaw falls under the Common Weakness Enumeration category CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability is particularly dangerous because it operates within the ActiveX control framework, which typically executes with elevated privileges when running in web browser contexts. Attackers can craft malicious web pages that invoke the vulnerable SetText method with oversized parameter values, causing the buffer to overflow and potentially overwrite critical memory segments including return addresses, function pointers, or other control data structures essential for proper program execution.
The operational impact of this vulnerability extends beyond simple code execution capabilities as it provides attackers with a potential pathway for complete system compromise within the ACTi NVR environment. Remote attackers who successfully exploit this vulnerability can execute arbitrary code with the privileges of the user running the affected ActiveX control, which often corresponds to system-level permissions when the NVR software operates in a privileged context. This could lead to unauthorized access to video feeds, modification of recording configurations, complete system takeover, or establishment of persistent backdoors within the network video surveillance infrastructure. The attack vector is particularly concerning as it requires no local access or authentication, making it suitable for remote exploitation through web-based attack methods that can be delivered via malicious websites or social engineering campaigns.
Mitigation strategies for this vulnerability should prioritize immediate remediation through official security patches provided by ACTi, as the vendor would have released updates addressing the specific buffer overflow conditions in the nvUnifiedControl.dll component. Organizations should implement network segmentation and access controls to limit exposure of NVR systems to untrusted networks while disabling unnecessary ActiveX controls in web browsers. Security professionals should also consider implementing network monitoring solutions capable of detecting anomalous traffic patterns associated with ActiveX control exploitation attempts and deploy application whitelisting policies to prevent execution of untrusted ActiveX components. The vulnerability aligns with ATT&CK technique T1190, which covers Exploit Public-Facing Application, and T1059, covering Command and Scripting Interpreter, as attackers could leverage this vulnerability to establish persistent access and execute malicious commands within the compromised system. Additionally, organizations should conduct comprehensive security assessments of their network video surveillance infrastructure to identify similar vulnerabilities in other ActiveX controls or legacy components that may present similar buffer overflow risks.