CVE-2005-2287 in wMailServer
Summary
by MITRE
SoftiaCom wMailServer 1.0 and 2.0 allows remote attackers to cause a denial of service (application crash) via a large TCP packet with a leading space, possibly triggering a buffer overflow.
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Analysis
by VulDB Data Team • 03/26/2019
The vulnerability identified as CVE-2005-2287 affects SoftiaCom wMailServer versions 1.0 and 2.0, presenting a significant security risk that can be exploited by remote attackers to disrupt service availability. This flaw manifests through a specific packet construction technique involving large TCP packets containing leading spaces, which can trigger application instability and ultimately lead to system crashes. The vulnerability represents a classic example of improper input validation where the mail server fails to adequately process malformed network traffic, creating an exploitable condition that undermines the system's reliability and availability.
The technical implementation of this vulnerability stems from the mail server's inadequate handling of TCP packet structures during network communication processing. When a remote attacker sends a specially crafted large TCP packet with a leading space, the wMailServer application fails to properly validate or sanitize the incoming data before processing it within its memory buffers. This processing error creates a condition where the application's buffer management mechanisms become overwhelmed or corrupted, resulting in an application crash that effectively denies service to legitimate users. The vulnerability specifically targets the server's protocol handling mechanisms, particularly those related to SMTP or similar mail transfer protocols that rely on TCP connections for communication.
From an operational perspective, this vulnerability presents a severe risk to email service availability and can be exploited with relatively simple network tools to cause system downtime. The attack vector requires minimal technical expertise to execute, making it particularly dangerous as it can be leveraged by attackers with basic networking knowledge. The impact extends beyond simple service disruption to potentially compromise the entire mail server infrastructure, as application crashes can lead to data loss, corrupted mail queues, and extended service outages that may require system restarts or even complete reinstallation of the affected software. This vulnerability directly violates the principle of robust error handling and input validation that security standards such as CWE-121 mandate for preventing buffer overflow conditions.
The exploitability of this vulnerability aligns with attack patterns documented in the MITRE ATT&CK framework, particularly under the service stoppage and denial of service categories. The attack can be classified as a network-based denial of service where the attacker leverages protocol implementation weaknesses to cause system instability. Organizations running affected versions of wMailServer face significant exposure risks, especially in environments where email services are critical for business operations. The vulnerability demonstrates a failure in the principle of least privilege and proper input sanitization, creating opportunities for attackers to gain unauthorized service disruption capabilities that can be used for both malicious and competitive purposes.
Mitigation strategies for this vulnerability should include immediate software updates or patches provided by the vendor, as well as network-level protections such as firewall rules that can filter malformed TCP packets or limit the size of incoming connections. System administrators should implement monitoring solutions to detect unusual traffic patterns that may indicate exploitation attempts, and should consider network segmentation to limit the potential impact of successful attacks. The vulnerability highlights the importance of regular security assessments and patch management processes, as it represents a known weakness that was likely addressed in subsequent software versions. Organizations should also implement intrusion detection systems that can identify and alert on suspicious TCP packet structures that match the described attack pattern, providing early warning capabilities to prevent service disruption incidents.