CVE-2005-1781 in Professional
Summary
by MITRE
Unknown vulnerability in SMTP authentication for MailEnable allows remote attackers to cause a denial of service (crash).
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 07/09/2019
The vulnerability identified as CVE-2005-1781 represents a critical weakness in the MailEnable email server software's Simple Mail Transfer Protocol authentication mechanism. This flaw specifically targets the authentication process that occurs during SMTP communication, creating an exploitable condition that enables remote attackers to trigger system instability. The vulnerability manifests as a denial of service condition where successful exploitation results in the complete crash of the MailEnable service, effectively rendering the email server unavailable to legitimate users and disrupting critical email communication infrastructure.
From a technical perspective, the vulnerability stems from inadequate input validation and error handling within the SMTP authentication module of MailEnable. When remote attackers send specially crafted authentication requests containing malformed data or excessive input parameters, the system fails to properly process these inputs, leading to memory corruption or stack overflow conditions. This type of vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. The authentication mechanism lacks proper bounds checking and input sanitization, allowing malicious payloads to exploit memory management flaws within the application's processing pipeline.
The operational impact of this vulnerability extends beyond simple service disruption, as it can severely compromise the availability of email services for organizations relying on MailEnable. Attackers can repeatedly exploit this weakness to maintain persistent denial of service conditions, potentially causing cascading failures in email infrastructure and affecting business continuity. The remote nature of the attack means that threat actors can target vulnerable systems from anywhere on the internet without requiring physical access or local privileges, making this vulnerability particularly dangerous for organizations with exposed email servers. This vulnerability directly maps to ATT&CK technique T1499.004, which covers network denial of service attacks, and represents a classic example of how authentication flaws can be weaponized for availability attacks.
Mitigation strategies for CVE-2005-1781 should prioritize immediate patching of affected MailEnable installations, as vendors typically released security updates addressing the specific input validation issues within the SMTP authentication module. Organizations should implement network segmentation to limit exposure of email servers to untrusted networks and consider deploying intrusion detection systems that can identify suspicious authentication patterns. Additionally, configuring rate limiting and connection throttling mechanisms can help reduce the impact of exploitation attempts. Security monitoring should focus on detecting unusual authentication request patterns and system crash events that may indicate successful exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation in authentication systems and highlights the need for comprehensive security testing of network services, particularly those handling user credentials and authentication requests.