CVE-2006-0853 in Ia Emailserver
Summary
by MITRE
Buffer overflow in the IMAP service of TrueNorth Internet Anywhere (IA) eMailserver 5.3.4 allows remote authenticated users to cause a denial of service (crash) and possibly execute arbitrary code via a long SEARCH argument.
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Analysis
by VulDB Data Team • 06/14/2019
The vulnerability described in CVE-2006-0853 represents a critical buffer overflow flaw within the IMAP service component of TrueNorth Internet Anywhere eMailserver version 5.3.4. This issue affects the email server's ability to process SEARCH commands through the IMAP protocol, creating a potential entry point for malicious actors to compromise system integrity. The vulnerability specifically manifests when the server receives a SEARCH argument that exceeds the allocated buffer size, leading to memory corruption that can result in unpredictable behavior.
The technical exploitation of this buffer overflow occurs through the IMAP service's insufficient input validation mechanisms during SEARCH command processing. When an authenticated user submits a SEARCH argument longer than the predetermined buffer capacity, the excess data overflows into adjacent memory locations, potentially corrupting critical program structures or executable code. This memory corruption can cause the IMAP service to crash immediately, resulting in a denial of service condition that disrupts email services for legitimate users. The vulnerability's classification as a buffer overflow aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enabling remote code execution, making it particularly dangerous for email server environments. Attackers who can authenticate to the system can leverage this flaw to crash the IMAP service repeatedly, causing persistent availability issues that may affect business operations and user productivity. The possibility of arbitrary code execution through this vulnerability means that successful exploitation could allow attackers to gain unauthorized control over the email server, potentially leading to data breaches, privilege escalation, or use as a pivot point for attacking other systems within the network infrastructure. This vulnerability directly maps to ATT&CK technique T1190, which covers exploitation of remote services through buffer overflow attacks.
Mitigation strategies for this vulnerability require immediate patching of the TrueNorth Internet Anywhere eMailserver to a version that addresses the buffer overflow issue in the IMAP service implementation. Organizations should implement network segmentation to limit access to email services and reduce the attack surface available to potential exploiters. Input validation controls should be strengthened to ensure that all SEARCH commands are properly bounded and sanitized before processing. Additionally, monitoring systems should be configured to detect unusual patterns in IMAP service usage that might indicate exploitation attempts. Security administrators should also consider implementing intrusion detection systems that can identify and alert on malformed SEARCH commands that exceed normal operational parameters. The vulnerability demonstrates the critical importance of proper input validation and memory management in network services, particularly those handling user-supplied data through protocol interfaces.