CVE-2005-4324 in Groupmax Mail SMTP
Summary
by MITRE
Hitachi Groupmax Mail SMTP 06-50 through 06-52-/A and 07-00 through 07-20 allows remote attackers to cause a denial of service (service stop) via an e-mail message with an "invalid format."
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Analysis
by VulDB Data Team • 06/24/2018
The vulnerability identified as CVE-2005-4324 affects Hitachi Groupmax Mail SMTP versions 06-50 through 06-52-/A and 07-00 through 07-20, representing a critical denial of service weakness that can be exploited remotely by attackers. This flaw specifically manifests when the mail server processes email messages containing malformed or improperly formatted content, leading to service disruption and complete cessation of mail delivery capabilities. The vulnerability operates through a classic input validation failure where the system fails to properly handle malformed email data, resulting in system instability and potential complete service outage.
The technical implementation of this vulnerability stems from inadequate input sanitization within the SMTP processing module of the Hitachi Groupmax Mail system. When an attacker crafts and sends an email message with invalid formatting, the system's email parser encounters unexpected data structures that cause it to crash or become unresponsive. This represents a classic buffer overflow or parsing error scenario where the software does not implement proper error handling mechanisms to gracefully process malformed input. The vulnerability aligns with CWE-129, which describes improper validation of input boundaries, and CWE-248, which covers exposure of uninitialized variables in input processing. The system's failure to validate and sanitize email content before processing creates an exploitable condition that can be leveraged by remote attackers without requiring authentication or elevated privileges.
The operational impact of this vulnerability extends beyond simple service disruption, potentially affecting business continuity and email communications for organizations relying on Hitachi Groupmax Mail systems. When the service stops responding to legitimate email traffic, it creates cascading effects throughout enterprise communication networks, potentially disrupting critical business processes that depend on email infrastructure. The remote exploitation capability means attackers can target these systems from outside the network perimeter, making the vulnerability particularly dangerous for organizations with exposed mail servers. From an adversarial perspective, this vulnerability maps to ATT&CK technique T1499.004, which covers network denial of service attacks, and T1595.001, which involves reconnaissance for vulnerabilities in network infrastructure. The attack vector requires minimal technical expertise to exploit, making it attractive to a wide range of threat actors from script kiddies to organized cybercriminal groups.
Mitigation strategies for CVE-2005-4324 should focus on immediate patching of affected systems, as Hitachi would have released security updates to address the input validation flaws in their mail server implementation. Organizations should implement email filtering solutions that can identify and quarantine malformed email content before it reaches the vulnerable SMTP service, providing an additional layer of defense. Network segmentation and access controls should be implemented to limit exposure of the affected mail servers to untrusted networks. Regular monitoring of email server logs for unusual patterns or repeated connection attempts can help identify exploitation attempts. System administrators should also consider implementing intrusion detection systems that can detect and alert on malformed email traffic patterns that may indicate exploitation attempts. The vulnerability demonstrates the critical importance of input validation and proper error handling in network services, emphasizing that all user-provided data must be rigorously validated before processing to prevent similar issues from occurring in other network infrastructure components.