CVE-2008-3607 in Email Server
Summary
by MITRE
The IMAP server in NoticeWare Email Server NG 4.6.3 and earlier allows remote attackers to cause a denial of service (daemon crash) via multiple long LOGIN commands.
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Analysis
by VulDB Data Team • 01/12/2025
The vulnerability described in CVE-2008-3607 represents a classic denial of service flaw within the IMAP server component of NoticeWare Email Server NG version 4.6.3 and earlier. This issue specifically targets the authentication mechanism of the email server, where an attacker can exploit a buffer handling weakness by sending multiple excessively long LOGIN commands to the IMAP daemon. The flaw stems from inadequate input validation and buffer management within the server's authentication processing logic, creating a condition where the daemon becomes unstable and eventually crashes. Such a vulnerability directly impacts the availability of email services, as the IMAP daemon failure renders the email server incapable of processing legitimate authentication requests from authorized users.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers buffer overflow vulnerabilities in heap-based memory management. The attack vector operates through the standard IMAP protocol where clients send LOGIN commands to authenticate with the email server. When multiple LOGIN commands containing excessively long strings are sent in rapid succession, the server's internal buffer handling mechanisms fail to properly manage the input data, leading to memory corruption that ultimately causes the daemon process to terminate unexpectedly. This type of vulnerability falls under the ATT&CK technique T1499.004, specifically targeting service stoppage through resource exhaustion and process termination.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be exploited by malicious actors to systematically degrade email server availability. The daemon crash creates a cascading effect where legitimate users cannot access their email accounts through IMAP clients, potentially affecting business communications and productivity. Organizations relying on NoticeWare Email Server NG for their email infrastructure face significant risk when this vulnerability remains unpatched, as the attack requires minimal resources to execute and can be automated for repeated exploitation. The vulnerability is particularly concerning because it affects the core authentication mechanism of the email server, meaning that even if other security controls are in place, the denial of service can still be achieved without requiring prior authentication or privilege escalation.
Mitigation strategies for CVE-2008-3607 primarily involve immediate patching of the NoticeWare Email Server NG software to version 4.6.4 or later, which contains the necessary fixes for the buffer handling issues. Network administrators should also implement rate limiting and connection throttling mechanisms at the network level to prevent rapid successive LOGIN command flooding. Additionally, monitoring systems should be configured to detect unusual patterns of authentication attempts that may indicate exploitation attempts. The implementation of intrusion detection systems capable of identifying malformed LOGIN commands and automatic daemon restart mechanisms can provide additional layers of protection. Organizations should also consider implementing network segmentation to limit the impact of potential exploitation and maintain comprehensive logging of authentication activities for forensic analysis purposes.