CVE-2008-1713 in Email Server
Summary
by MITRE
MailServer.exe in NoticeWare Email Server 4.6.1.0 allows remote attackers to cause a denial of service (application crash) via a long string to IMAP port (143/tcp).
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/20/2024
The vulnerability identified as CVE-2008-1713 affects the NoticeWare Email Server version 4.6.1.0, specifically targeting its MailServer.exe component that handles IMAP protocol communications on port 143/tcp. This represents a classic buffer overflow condition that occurs when the application fails to properly validate input length before processing incoming data through the IMAP interface. The flaw stems from inadequate bounds checking mechanisms within the email server's IMAP implementation, allowing malicious actors to craft specially crafted payloads containing excessively long strings that exceed the allocated buffer space. Such input validation failures are categorized under CWE-121 as buffer overflow conditions, where insufficient boundary checking permits data to overwrite adjacent memory locations. The vulnerability exists in the application's handling of IMAP commands, particularly when processing user authentication or command parameters that are transmitted over the network.
The operational impact of this vulnerability extends beyond simple service disruption as it enables remote attackers to execute denial of service attacks without requiring authentication or privileged access. When a malformed long string is sent to the IMAP port, the MailServer.exe process becomes unstable and terminates unexpectedly, causing the email server to crash and become unavailable to legitimate users. This type of attack directly violates the availability principle of the CIA triad and can be classified under ATT&CK technique T1499.004 for network denial of service attacks. The vulnerability is particularly concerning because it allows attackers to disrupt email services without requiring any prior access credentials, making it an attractive target for malicious actors seeking to compromise business continuity. The crash occurs during the processing of IMAP commands, which means that legitimate users attempting to access their email accounts would experience immediate service interruptions.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and bounds checking mechanisms within the email server software. System administrators should immediately apply vendor patches or updates that address the buffer overflow condition in the IMAP implementation. Network-level protections such as firewall rules that limit access to port 143 from trusted sources only can provide temporary defense while permanent fixes are deployed. Additionally, implementing intrusion detection systems that monitor for unusual traffic patterns on IMAP ports may help detect exploitation attempts. The vulnerability highlights the importance of secure coding practices and input validation in network services, particularly those handling user-provided data through protocols like IMAP that are commonly targeted by attackers. Organizations should also consider implementing application-level firewalls or proxy services that can perform additional input sanitization before forwarding requests to the vulnerable email server component. Regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow conditions in other network services and applications.