CVE-2000-1021 in MDaemon
Summary
by MITRE
Heap overflow in WebConfig in Mdaemon 3.1.1 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary commands via a long URL.
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Analysis
by VulDB Data Team • 02/01/2025
The vulnerability identified as CVE-2000-1021 represents a critical heap overflow condition within the WebConfig component of Mdaemon email server software versions 3.1.1 and earlier. This flaw exists in the handling of URL parameters processed by the web-based configuration interface, creating a pathway for remote attackers to exploit memory corruption issues. The heap overflow occurs when the application fails to properly validate the length of incoming URL strings, allowing maliciously crafted inputs to exceed allocated memory boundaries and overwrite adjacent heap memory regions.
The technical implementation of this vulnerability stems from inadequate input validation mechanisms within the web configuration module. When Mdaemon processes HTTP requests containing excessively long URLs through its WebConfig interface, the application does not enforce proper bounds checking on the URL parameter length. This lack of sanitization allows attackers to construct malicious URLs that trigger memory allocation failures, causing the heap memory to become corrupted. The vulnerability manifests as a classic buffer overflow condition where the application's memory management routines fail to account for the extended input length, leading to unpredictable behavior in the heap allocation structure.
From an operational perspective, this vulnerability presents significant risks to system availability and potentially system compromise. The primary impact is a denial of service condition that can cause the Mdaemon web configuration service to crash or become unresponsive, disrupting email services for organizations relying on this software. However, the more concerning aspect is the potential for arbitrary code execution, which could allow attackers to gain unauthorized access to the system and execute malicious commands with the privileges of the running service. This makes the vulnerability particularly dangerous in environments where Mdaemon serves as a critical email infrastructure component.
The vulnerability aligns with CWE-122, which describes heap-based buffer overflow conditions, and demonstrates characteristics consistent with attack patterns found in the MITRE ATT&CK framework under the T1203 technique for exploitation of remote services. Organizations utilizing Mdaemon 3.1.1 or earlier versions should prioritize immediate remediation through official vendor patches or upgrading to supported software versions. Mitigation strategies include implementing network-level restrictions to limit access to the WebConfig interface, deploying intrusion detection systems to monitor for suspicious URL patterns, and applying proper input validation at the application level to prevent oversized parameter processing. Additionally, organizations should conduct comprehensive vulnerability assessments to identify any other instances of similar memory corruption issues within their email infrastructure components.