CVE-2008-7106 in PureMessage for Microsoft Exchange
Summary
by MITRE
The installation of Sophos PureMessage for Microsoft Exchange 3.0 before 3.0.2, when both anti-virus and anti-spam are supported, does not create or launch the associated scan engines when the system is under heavy load, which has unspecified impact, probably remote bypass of scanner protection or a denial of service (message loss or delay).
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Analysis
by VulDB Data Team • 12/16/2017
The vulnerability identified as CVE-2008-7106 affects Sophos PureMessage for Microsoft Exchange version 3.0 and earlier, specifically when both anti-virus and anti-spam protection features are enabled. This flaw represents a critical design weakness in the software's resource management and engine initialization processes. The vulnerability stems from the application's inability to properly handle system resource constraints during periods of high demand, which directly impacts the core security functionality of the email protection system.
The technical implementation of this vulnerability manifests when the system experiences heavy load conditions, such as high email volume or resource contention. Under these circumstances, the Sophos PureMessage service fails to properly initialize or launch the associated scan engines that are responsible for detecting malicious content and spam messages. This failure occurs because the software does not adequately prioritize or manage system resources during peak usage periods, leading to a cascading failure in the protection mechanisms. The flaw operates at the system integration level, where the anti-virus and anti-spam components are designed to work in conjunction but fail to maintain their operational state under stress conditions.
The operational impact of this vulnerability extends beyond simple performance degradation to potentially compromise the entire email security posture of an organization. When the scan engines fail to launch or operate correctly under heavy load, attackers can exploit this gap to bypass security controls, potentially delivering malicious content or spam directly to users without detection. This represents a significant risk for organizations relying on the software for email protection, as it creates a window of vulnerability where the system's primary defense mechanisms are effectively disabled. The vulnerability could result in message loss, delayed delivery of legitimate emails, or complete denial of service for email functionality, depending on how the system handles the engine failures.
From a cybersecurity perspective, this vulnerability aligns with CWE-400, which addresses "Uncontrolled Resource Consumption," and represents a failure in resource management and system resilience. The potential for remote bypass of scanner protection places this vulnerability in the ATT&CK framework under the Tactic of Execution and Defense Evasion, as it allows adversaries to circumvent security controls without direct system compromise. Organizations implementing this software should prioritize immediate patching to version 3.0.2 or later, which addresses the resource management issues. Additional mitigations include implementing load balancing strategies, monitoring system resource utilization, and establishing redundancy mechanisms to ensure that critical security functions remain operational during high-traffic periods. The vulnerability underscores the importance of robust resource management in security software, particularly in enterprise environments where email systems experience variable but often high loads.