CVE-2007-1637 in IMAIL
Summary
by MITRE
Multiple buffer overflows in the IMAILAPILib ActiveX control (IMailAPI.dll) in Ipswitch IMail Server before 2006.2 allow remote attackers to execute arbitrary code via the (1) WebConnect and (2) Connect members in the (a) IMailServer control; (3) Sync3 and (4) Init3 members in the (b) IMailLDAPService control; and the (5) SetReplyTo member in the (c) IMailUserCollection control.
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Analysis
by VulDB Data Team • 07/16/2019
The vulnerability described in CVE-2007-1637 represents a critical buffer overflow issue within the IMAILAPILib ActiveX control component of Ipswitch IMail Server versions prior to 2006.2. This flaw exists within the IMailAPI.dll library and affects multiple methods across different control objects, creating a substantial attack surface that could be exploited by remote adversaries. The vulnerability specifically targets ActiveX controls that are typically deployed in web environments where user input is processed through these components, making them particularly dangerous in internet-facing applications. The presence of multiple affected methods across different control classes indicates a systemic design flaw rather than an isolated incident, suggesting that the underlying buffer management mechanisms were inadequately implemented across the entire ActiveX control framework.
The technical implementation of this vulnerability stems from improper input validation and insufficient bounds checking within the ActiveX control methods. When remote attackers provide maliciously crafted input to the vulnerable methods, the control fails to properly validate the length or content of the input data before copying it into fixed-size buffers. This classic buffer overflow condition occurs because the application does not verify that incoming data fits within allocated memory boundaries before performing copy operations. The specific methods affected include WebConnect and Connect members of the IMailServer control, Sync3 and Init3 members of the IMailLDAPService control, and the SetReplyTo member of the IMailUserCollection control. Each of these methods processes user-supplied input without adequate sanitization, creating opportunities for attackers to overwrite adjacent memory locations and potentially execute arbitrary code. The vulnerability operates at the memory management level where stack-based or heap-based buffer overflows can occur, depending on how the input data is processed within the control's internal memory structures.
From an operational perspective, this vulnerability presents a severe risk to organizations utilizing Ipswitch IMail Server in environments where the ActiveX controls are exposed to untrusted network traffic. The remote execution capability means that attackers do not require local system access or authentication to exploit the vulnerability, making it particularly dangerous for email server infrastructure. The attack vector typically involves crafting specially formatted HTTP requests or other network communications that invoke the vulnerable ActiveX methods through web interfaces or other client-side applications. Successful exploitation could result in complete system compromise, allowing attackers to execute arbitrary commands with the privileges of the affected service account. This level of access could enable attackers to establish persistent backdoors, exfiltrate sensitive email data, modify email configurations, or use the compromised server as a pivot point for attacking internal network resources. The vulnerability's impact extends beyond simple code execution to encompass potential data breaches and service disruption that could affect thousands of email users within an organization.
Organizations affected by this vulnerability should prioritize immediate remediation through patching the Ipswitch IMail Server to version 2006.2 or later, which contains the necessary fixes for the buffer overflow conditions. Additionally, network segmentation strategies should be implemented to limit exposure of ActiveX controls to untrusted networks, and web application firewalls should be configured to filter suspicious input patterns targeting these specific methods. Security monitoring should include detection of unusual ActiveX control usage patterns and attempts to invoke vulnerable methods through web interfaces. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios, both of which are common targets for remote code execution attacks. From an ATT&CK framework perspective, this vulnerability maps to techniques involving execution through web shells and remote service exploitation, specifically targeting the T1190 - Exploit Public-Facing Application and T1059 - Command and Scripting Interpreter tactics. Organizations should also consider implementing additional security controls such as disabling ActiveX controls in web browsers where possible, employing application whitelisting policies, and conducting regular security assessments to identify similar vulnerabilities in other legacy ActiveX components within their email infrastructure.