CVE-2005-3993 in Mailenable Enterprise
Summary
by MITRE
Multiple unspecified vulnerabilities in MailEnable Professional 1.6 and earlier and Enterprise 1.1 and earlier allow attackers to cause a denial of service (crash) via invalid IMAP commands.
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Analysis
by VulDB Data Team • 07/27/2017
The vulnerability identified as CVE-2005-3993 affects MailEnable Professional 1.6 and earlier versions as well as MailEnable Enterprise 1.1 and earlier versions. This issue represents a significant security weakness in email server software that impacts the availability of critical communication infrastructure. The vulnerability manifests through improper handling of invalid IMAP commands, which can be exploited by malicious actors to disrupt email services. The lack of specific details in the initial description suggests that multiple distinct flaws exist within the IMAP implementation, making this vulnerability particularly concerning from a security research perspective. These types of issues often indicate poor input validation and error handling mechanisms within the email server software.
The technical flaw stems from insufficient validation of IMAP protocol commands received by the MailEnable server. When the system encounters malformed or unexpected IMAP commands, it fails to properly process these inputs and instead crashes or becomes unresponsive. This behavior aligns with common software security vulnerabilities categorized under CWE-20, which deals with improper input validation, and CWE-129, concerning improper validation of array index. The vulnerability represents a classic example of a buffer overflow or exception handling failure that can be triggered through network-based attacks. Attackers can craft specially formatted IMAP commands that cause the server to enter an undefined state, leading to complete service disruption.
The operational impact of this vulnerability extends beyond simple service interruption to potentially compromise the entire email infrastructure. Organizations relying on affected MailEnable versions face significant risk of email service outages that can disrupt business communications and potentially impact critical operations. The denial of service condition affects not only the immediate availability of email services but can also impact other connected systems that depend on the email server for functionality. From an attacker perspective, this vulnerability provides a straightforward method to disrupt services without requiring advanced technical skills or extensive resources. The attack vector is particularly dangerous because it can be executed remotely, making it accessible to a wide range of threat actors. This vulnerability also demonstrates the importance of proper protocol implementation and error handling in mission-critical infrastructure components.
Mitigation strategies for CVE-2005-3993 should focus on immediate patching of affected systems, as this vulnerability was likely addressed through software updates released by MailEnable. Organizations should implement network-level protections such as firewalls and intrusion detection systems to monitor and filter suspicious IMAP traffic patterns. The implementation of proper input validation and error handling mechanisms should be prioritized in all email server implementations to prevent similar issues from occurring in the future. Security teams should also consider implementing monitoring solutions that can detect unusual patterns of IMAP command usage that might indicate attempted exploitation. Additionally, organizations should review their incident response procedures to ensure rapid detection and remediation of similar vulnerabilities. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches and implementing robust security practices throughout the software development lifecycle. From an ATT&CK framework perspective, this vulnerability maps to techniques involving service stoppage and availability disruption, which fall under the broader category of impact tactics used by adversaries to compromise system availability.