CVE-2007-5064 in Web Thunder
Summary
by MITRE
Buffer overflow in a certain ActiveX control in Xunlei Web Thunder 5.6.9.344, possibly the DapPlayer ActiveX control in DapPlayer_Now.dll, allows remote attackers to execute arbitrary code via a long first argument to the DownURL2 method. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 07/29/2019
The vulnerability identified as CVE-2007-5064 represents a critical buffer overflow flaw within the Xunlei Web Thunder 5.6.9.344 ActiveX control ecosystem. This specific weakness manifests in what appears to be the DapPlayer ActiveX control contained within the DapPlayer_Now.dll library, creating a pathway for remote code execution that poses significant security risks to affected systems. The vulnerability is particularly concerning as it operates through a method named DownURL2 which accepts a first argument that, when excessively long, triggers the buffer overflow condition.
The technical implementation of this vulnerability stems from inadequate input validation within the ActiveX control's DownURL2 method. When an attacker supplies a maliciously crafted argument that exceeds the allocated buffer space, the excess data overflows into adjacent memory regions, potentially allowing the execution of arbitrary code with the privileges of the affected user. This type of flaw falls under the CWE-121 category of stack-based buffer overflow, where the buffer overflow occurs in stack memory and can be exploited through careful manipulation of the input data to overwrite return addresses and control flow information. The attack vector is particularly dangerous as it requires no local privileges and can be executed remotely through web browsers that have the vulnerable ActiveX control installed.
The operational impact of this vulnerability extends beyond simple code execution to encompass full system compromise capabilities. Attackers can leverage this weakness to install malware, modify system configurations, access sensitive data, or establish persistent backdoors within affected environments. The vulnerability affects systems running Windows operating systems where the Xunlei Web Thunder client is installed, particularly those that have not implemented proper security measures or updates. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059.007 for command and scripting interpreter and T1068 for exploit for privilege escalation, as the successful exploitation would typically require the attacker to first gain initial access through the vulnerable ActiveX control and then escalate privileges to achieve full system compromise. The vulnerability also aligns with T1190 for exploit public-facing application, as the attack can be initiated through web-based interfaces that utilize the vulnerable control.
Mitigation strategies for CVE-2007-5064 must address both immediate remediation and long-term security posture improvements. Organizations should immediately disable or remove the vulnerable ActiveX controls from affected systems, particularly those that are no longer necessary for business operations. Browser security configurations should be updated to prevent automatic execution of ActiveX controls, and users should be educated about the risks associated with downloading and executing unknown software. From a defensive standpoint, implementing application whitelisting policies can prevent execution of unauthorized ActiveX controls, while network-based intrusion detection systems can help identify attempts to exploit this vulnerability. The vulnerability also underscores the importance of regular security updates and patch management processes, as many of these legacy ActiveX controls were never properly maintained or updated by their vendors. System administrators should also consider implementing sandboxing techniques for web browsing activities and monitoring for suspicious network traffic patterns that may indicate exploitation attempts. Additionally, organizations should conduct regular security assessments to identify and remediate other potentially vulnerable ActiveX controls that may share similar architectural flaws.