CVE-2006-2646 in MDaemon
Summary
by MITRE
Buffer overflow in Alt-N MDaemon, possibly 9.0.1 and earlier, allows remote attackers to execute arbitrary code via a long A0001 argument that begins with a " (double quote).
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Analysis
by VulDB Data Team • 07/27/2018
The vulnerability identified as CVE-2006-2646 represents a critical buffer overflow flaw within Alt-N MDaemon email server software, specifically affecting versions 9.0.1 and earlier. This security weakness resides in the handling of command arguments within the mail server's protocol implementation, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized system control. The vulnerability manifests when the application processes a specially crafted A0001 argument that commences with a double quote character, triggering the buffer overflow condition that compromises the application's memory integrity.
The technical implementation of this flaw stems from inadequate input validation and bounds checking within the MDaemon email server's command processing mechanism. When the system encounters the malicious A0001 argument beginning with a double quote, it fails to properly validate the length of the input data before copying it into a fixed-size buffer. This classic buffer overflow vulnerability falls under the CWE-121 category of Stack-based Buffer Overflow, where insufficient bounds checking allows an attacker to overwrite adjacent memory locations. The specific trigger condition of starting with a double quote character suggests that the vulnerability may be related to how the application parses quoted strings or handles command argument processing, potentially involving improper handling of escape sequences or string termination markers.
The operational impact of this vulnerability extends far beyond simple denial of service, as it provides remote attackers with the capability to execute arbitrary code on the affected system with the privileges of the MDaemon service account. This remote code execution vulnerability enables attackers to gain full control over the email server, potentially leading to data exfiltration, system compromise, and the establishment of persistent backdoors. The attack vector requires only a remote connection to the MDaemon server and the ability to send specially crafted commands, making it particularly dangerous for organizations relying on this email infrastructure. Organizations running vulnerable versions of MDaemon face significant risk of unauthorized access and potential complete system compromise, especially in environments where email servers are directly exposed to internet traffic without proper network segmentation.
Mitigation strategies for CVE-2006-2646 should prioritize immediate patching of affected MDaemon installations to the latest available versions that contain the necessary security fixes. System administrators should implement network segmentation to limit direct internet access to email servers, utilizing firewalls and access control lists to restrict connections to only necessary ports and protocols. Additional defensive measures include implementing intrusion detection systems to monitor for suspicious command patterns and establishing robust network monitoring to detect potential exploitation attempts. The vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1071.004 for Application Layer Protocol, highlighting the need for comprehensive security monitoring and response capabilities. Organizations should also consider implementing application whitelisting policies and regular security assessments to identify and remediate similar vulnerabilities in other email server implementations and network services.