CVE-2003-1322 in Mercur Mailserver
Summary
by MITRE
Multiple stack-based buffer overflows in Atrium MERCUR IMAPD in MERCUR Mailserver before 4.2.15.0 allow remote attackers to execute arbitrary code via a long (1) EXAMINE, (2) DELETE, (3) SUBSCRIBE, (4) RENAME, (5) UNSUBSCRIBE, (6) LIST, (7) LSUB, (8) STATUS, (9) LOGIN, (10) CREATE, or (11) SELECT command.
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Analysis
by VulDB Data Team • 07/14/2025
The vulnerability identified as CVE-2003-1322 represents a critical stack-based buffer overflow in the Atrium MERCUR IMAPD component of the MERCUR Mailserver software. This flaw affects versions prior to 4.2.15.0 and exposes the system to remote code execution attacks through carefully crafted IMAP commands. The vulnerability specifically targets multiple IMAP command handlers including EXAMINE, DELETE, SUBSCRIBE, RENAME, UNSUBSCRIBE, LIST, LSUB, STATUS, LOGIN, CREATE, and SELECT operations. The buffer overflow occurs when the server processes these commands with excessively long input parameters, causing memory corruption that can be exploited by malicious actors to gain unauthorized control over the affected system.
From a technical perspective, this vulnerability falls under the CWE-121 stack-based buffer overflow category, which is classified as a fundamental memory safety issue where data written to a buffer exceeds the allocated stack space. The flaw manifests when the IMAP server fails to properly validate input length before processing commands, allowing attackers to overwrite adjacent stack memory locations including return addresses and function pointers. This type of vulnerability is particularly dangerous because it enables arbitrary code execution without requiring authentication, making it a prime target for automated exploitation. The attack vector is remote and requires no special privileges, as the vulnerability exists in the server's handling of legitimate IMAP commands.
The operational impact of this vulnerability is severe and multifaceted. Attackers can leverage this flaw to execute arbitrary code with the privileges of the IMAP server process, potentially leading to complete system compromise. The vulnerability affects email server infrastructure that relies on the MERCUR Mailserver platform, making it particularly concerning for organizations with significant email services. The exploitability factor is high due to the remote nature of the attack and the fact that the vulnerable commands are commonly used in standard email client operations. Organizations running affected versions face risks of data breaches, service disruption, and potential lateral movement within their network infrastructure, as the compromised server could serve as a foothold for further attacks.
Mitigation strategies for this vulnerability should focus on immediate patch application to upgrade to MERCUR Mailserver version 4.2.15.0 or later, which contains the necessary fixes for the buffer overflow conditions. Network administrators should implement monitoring and intrusion detection systems to identify potential exploitation attempts targeting these specific IMAP commands. Additional defensive measures include configuring firewalls to restrict access to IMAP ports, implementing input validation at network boundaries, and conducting regular security assessments of email server configurations. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1059.007 Command and Scripting Interpreter: Python and T1210 Exploitation of Remote Services, emphasizing the need for both perimeter defense and application-level security controls. The vulnerability also highlights the importance of proper input validation and memory management practices in server-side applications, reinforcing the principles of secure coding standards and defensive programming techniques recommended by organizations such as the Open Web Application Security Project OWASP.