CVE-2002-0997 in Netmail
Summary
by MITRE
Buffer overflows in IMAP Agent (imapd) for Novell NetMail (NIMS) 3.0.3 before 3.0.3A allows remote attackers to cause a denial of service.
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Analysis
by VulDB Data Team • 06/28/2024
The vulnerability identified as CVE-2002-0997 represents a critical buffer overflow condition within the IMAP Agent component of Novell NetMail Server version 3.0.3 and earlier releases. This flaw specifically affects the IMAP daemon implementation that handles internet message access protocol requests, creating a pathway for malicious actors to exploit the software's memory management practices. The vulnerability resides in how the imapd service processes incoming network data, particularly when handling certain command sequences or malformed input parameters that exceed allocated buffer boundaries.
The technical exploitation of this buffer overflow occurs when remote attackers send specially crafted IMAP commands to the affected server, causing the application to write data beyond the bounds of allocated memory buffers. This memory corruption can lead to unpredictable application behavior, including application crashes, termination of the imapd process, and ultimately resulting in a denial of service condition that prevents legitimate users from accessing their email accounts through IMAP protocols. The flaw demonstrates characteristics consistent with CWE-121, heap-based buffer overflow conditions, where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability aligns with ATT&CK technique T1499.004, specifically targeting network denial of service through application-level attacks.
The operational impact of this vulnerability extends beyond simple service disruption, as it represents a foundational security weakness that could potentially be leveraged for more sophisticated attacks if combined with other exploits. Organizations relying on Novell NetMail Server 3.0.3 or earlier versions face significant risk of service interruption, particularly during peak usage periods when multiple users attempt to access their email accounts simultaneously. The nature of the vulnerability means that even a single malicious connection attempt could compromise the entire IMAP service, making it particularly attractive to attackers seeking to disrupt email communications within targeted organizations.
Mitigation strategies for this vulnerability primarily focus on immediate patching of the affected software components, as Novell has released updated versions including 3.0.3A and later releases that address the buffer overflow conditions. System administrators should prioritize deployment of these patches across all affected servers and conduct thorough testing to ensure that the updates do not introduce compatibility issues with existing email workflows or client configurations. Additional defensive measures include implementing network-level access controls to restrict IMAP service exposure, deploying intrusion detection systems to monitor for suspicious IMAP traffic patterns, and establishing robust monitoring protocols to detect service disruptions that may indicate exploitation attempts. The vulnerability underscores the importance of maintaining current software versions and implementing proper input validation practices to prevent similar memory corruption issues in other network services.