CVE-2008-3866 in Internet Security 2008
Summary
by MITRE
The Trend Micro Personal Firewall service (aka TmPfw.exe) in Trend Micro Network Security Component (NSC) modules, as used in Trend Micro OfficeScan 8.0 SP1 Patch 1 and Internet Security 2007 and 2008 17.0.1224, relies on client-side password protection implemented in the configuration GUI, which allows local users to bypass intended access restrictions and change firewall settings by using a modified client to send crafted packets.
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Analysis
by VulDB Data Team • 08/26/2019
The vulnerability identified as CVE-2008-3866 represents a critical security flaw in the Trend Micro Personal Firewall service implementation within the Network Security Component modules. This issue affects Trend Micro OfficeScan 8.0 SP1 Patch 1 and Internet Security 2007 and 2008 versions, specifically targeting the TmPfw.exe service that manages firewall configurations. The vulnerability stems from the improper implementation of access controls where the system relies solely on client-side password protection mechanisms within the graphical user interface rather than implementing robust server-side authentication controls. This design flaw creates a fundamental weakness in the security architecture that directly violates established security principles of defense in depth and principle of least privilege.
The technical exploitation of this vulnerability occurs through a sophisticated attack vector that leverages the inherent weakness in the client-side authentication model. Local attackers can bypass the intended access restrictions by creating a modified client application that sends crafted packets directly to the firewall service without going through the standard GUI interface. This approach circumvents the password protection mechanisms that are typically enforced within the configuration GUI, allowing unauthorized modification of firewall rules and security policies. The vulnerability operates at the protocol level where the service accepts commands based on packet content rather than proper authentication verification, making it particularly dangerous as it can be exploited without requiring elevated privileges beyond local system access. This type of vulnerability is classified under CWE-287 which deals with improper authentication issues, specifically focusing on weak or bypassable authentication mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete compromise of the firewall protection mechanisms. Attackers who successfully exploit this vulnerability can modify firewall rules, potentially opening ports, disabling security features, or creating backdoors that could allow further compromise of the system. The implications are particularly severe in enterprise environments where Trend Micro OfficeScan is deployed, as it could enable attackers to gain unauthorized access to internal network resources that should be protected by the firewall. This vulnerability essentially undermines the core purpose of the personal firewall service, which is designed to protect against unauthorized network access and malicious traffic. The attack can be executed silently without detection by standard security monitoring tools since it operates within the legitimate service framework, making it particularly challenging to detect and mitigate. This exploitation pattern aligns with ATT&CK technique T1068 which covers local privilege escalation and T1566 which addresses credential harvesting and manipulation.
Mitigation strategies for this vulnerability must address both the immediate security gap and the underlying architectural flaw in the authentication implementation. Organizations should immediately apply the vendor-provided patches and updates that fix the authentication mechanism to ensure proper server-side validation of all configuration changes. Network administrators should implement additional monitoring controls to detect unusual firewall configuration changes and establish baseline configurations that can be quickly restored if unauthorized modifications occur. The recommended approach involves strengthening the authentication model by implementing server-side verification of all administrative commands rather than relying on client-side password validation. Security teams should also consider implementing network segmentation and access controls that limit the potential impact of any successful exploitation attempts. Regular security assessments should be conducted to identify similar authentication weaknesses in other security components, as this vulnerability demonstrates a pattern of inadequate authentication controls that could exist in other parts of the security infrastructure. The remediation process should also include comprehensive security awareness training for administrators to recognize and prevent similar issues in other security solutions that may be deployed within the organization.