CVE-2005-2472 in BusinessMail
Summary
by MITRE
Multiple buffer overflows in BusinessMail 4.60.00 allow remote attackers to cause a denial of service (application crash) via a long string to SMTP (1) HELO or (2) MAIL FROM commands.
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Analysis
by VulDB Data Team • 06/08/2019
The vulnerability identified as CVE-2005-2472 represents a critical buffer overflow flaw in BusinessMail version 4.60.00 that specifically targets the Simple Mail Transfer Protocol implementation within the software. This vulnerability affects the handling of SMTP commands, particularly the HELO and MAIL FROM command sequences that are fundamental to email communication protocols. The flaw stems from insufficient input validation and boundary checking mechanisms within the application's SMTP server component, which fails to properly sanitize user-supplied data before processing. The vulnerability manifests when remote attackers send specially crafted long strings to the SMTP service, exploiting the lack of proper buffer size enforcement in the command parsing logic.
The technical exploitation of this vulnerability occurs through the manipulation of SMTP command parameters where the application does not validate the length of incoming data before copying it into fixed-size buffers. When a maliciously long string is sent as part of either the HELO or MAIL FROM commands, the buffer overflow condition is triggered, causing the application to crash or behave unpredictably. This behavior aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient checks on input length lead to memory corruption. The vulnerability specifically affects the application's ability to maintain stable operation during legitimate email transmission processes, creating a denial of service condition that can be easily exploited by remote attackers without requiring authentication or privileged access.
The operational impact of this vulnerability extends beyond simple service disruption as it can be leveraged by malicious actors to systematically degrade email services provided by affected systems. Attackers can repeatedly send malformed SMTP commands to cause repeated application crashes, effectively rendering the email service unavailable to legitimate users. This makes the vulnerability particularly dangerous in enterprise environments where BusinessMail serves as a critical communication infrastructure component. The lack of authentication requirements for exploitation means that any remote party can potentially target the service, making it a significant threat to email server availability. Organizations utilizing this version of BusinessMail face increased risk of service interruptions that can impact business operations and communication workflows.
Mitigation strategies for CVE-2005-2472 should focus on immediate patching of the affected BusinessMail version to address the buffer overflow conditions in the SMTP implementation. Organizations should implement network-level protections such as SMTP command filtering and input length restrictions at network boundaries to prevent malicious traffic from reaching vulnerable systems. The implementation of proper input validation and boundary checking mechanisms within the application code represents the fundamental solution to prevent similar vulnerabilities in future iterations. Security monitoring should include detection of unusual SMTP command patterns and excessive connection attempts that may indicate exploitation attempts. Additionally, organizations should consider implementing email filtering solutions that can detect and block malformed SMTP commands before they reach the vulnerable application, aligning with defensive strategies outlined in the mitre ATT&CK framework for email-based attacks and network service exploitation techniques.