CVE-2010-2580 in MailEnable
Summary
by MITRE
The SMTP service (MESMTPC.exe) in MailEnable 3.x and 4.25 does not properly perform a length check, which allows remote attackers to cause a denial of service (crash) via a long (1) email address in the MAIL FROM command, or (2) domain name in the RCPT TO command, which triggers an "unhandled invalid parameter error."
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Analysis
by VulDB Data Team • 01/23/2025
The vulnerability identified as CVE-2010-2580 affects the MailEnable SMTP service implementation in versions 3.x and 4.25, specifically targeting the MESMTPC.exe process responsible for handling email transmission protocols. This flaw represents a classic buffer overflow condition that occurs when the system fails to properly validate input parameter lengths during SMTP command processing. The vulnerability manifests when attackers submit maliciously crafted email addresses or domain names that exceed predetermined length limits within the MAIL FROM and RCPT TO SMTP commands, leading to system instability and potential service disruption.
The technical mechanism behind this vulnerability involves improper input validation within the SMTP service's command parsing logic. When the MESMTPC.exe process receives a MAIL FROM command with an excessively long email address or a RCPT TO command containing an overly long domain name, the system does not perform adequate boundary checking on the input parameters. This lack of proper length validation causes the application to attempt processing data beyond its allocated memory buffers, resulting in an unhandled invalid parameter error that ultimately leads to process termination and system crash. The vulnerability operates at the protocol level, making it particularly dangerous as it can be exploited through standard email transmission methods without requiring special privileges or authentication.
The operational impact of this vulnerability extends beyond simple service disruption to encompass broader security implications for email infrastructure. Organizations relying on affected MailEnable versions face potential denial of service attacks that can render their email services unavailable to legitimate users, disrupting business communications and potentially causing significant operational downtime. The vulnerability's remote exploitability means that attackers can trigger the condition from external networks without requiring physical access to the system, making it particularly concerning for email servers that are publicly accessible. This type of vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a common pattern in legacy software implementations where input validation was not adequately implemented or tested.
Mitigation strategies for CVE-2010-2580 should prioritize immediate software updates and patches provided by MailEnable, as the vendor has likely released fixes addressing the specific buffer overflow conditions. Organizations should implement network-level restrictions to limit SMTP traffic from suspicious sources and consider deploying intrusion detection systems that can identify abnormal SMTP command patterns. Additionally, administrators should configure proper input validation mechanisms at network boundaries to filter out excessively long email addresses and domain names before they reach the vulnerable SMTP service. The remediation approach should follow ATT&CK technique T1499.004, which focuses on avoiding or preventing exploitation of vulnerabilities through proper patch management and input sanitization. Regular security assessments and network monitoring should be implemented to detect potential exploitation attempts and ensure that the patched systems remain secure against similar vulnerabilities.