CVE-2005-3640 in FTGate
Summary
by MITRE
Multiple buffer overflows in the IMAP Groupware Mail server of Floosietek FTGate (FTGate4) 4.1 allow remote attackers to execute arbitrary code via long arguments to various IMAP commands, as demonstrated with the EXAMINE command.
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Analysis
by VulDB Data Team • 06/11/2019
The vulnerability identified as CVE-2005-3640 represents a critical security flaw within the Floosietek FTGate 4.1 IMAP Groupware Mail server implementation. This vulnerability manifests as multiple buffer overflows that occur when processing IMAP commands, specifically exposing the system to remote code execution attacks through carefully crafted malicious input. The flaw affects the server's handling of various IMAP commands, with particular emphasis on the EXAMINE command as demonstrated in exploit scenarios. Such buffer overflow conditions create opportunities for attackers to overwrite adjacent memory locations, potentially leading to arbitrary code execution within the context of the mail server process.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The IMAP protocol implementation in FTGate 4.1 fails to properly validate the length of incoming arguments before processing them, creating a pathway for malicious input to exceed allocated buffer boundaries. This particular flaw operates at the application layer, leveraging the IMAP service's functionality to deliver payloads that can manipulate program execution flow. The vulnerability's remote exploitability means that attackers do not require local system access, making it particularly dangerous in networked environments where mail servers are exposed to external traffic.
From an operational perspective, this vulnerability poses significant risks to organizations relying on FTGate 4.1 for email services. The potential for remote code execution allows attackers to gain unauthorized access to the mail server, potentially leading to data breaches, email interception, or further network infiltration. The attack surface expands when considering that IMAP servers typically handle sensitive email communications and may contain privileged information. The exploitability of this vulnerability through the EXAMINE command demonstrates how seemingly routine email operations can serve as attack vectors. Organizations with exposed IMAP services face immediate threats of compromise, as the vulnerability can be exploited without authentication requirements, potentially allowing for reconnaissance and privilege escalation activities.
Security mitigations for CVE-2005-3640 should focus on immediate patching of the FTGate 4.1 software to address the buffer overflow conditions in IMAP command handling. Organizations should implement network segmentation to limit access to mail server services, particularly restricting IMAP access to trusted internal networks. Input validation measures should be strengthened at the application level to prevent overly long arguments from being processed without proper bounds checking. The ATT&CK framework categorizes this vulnerability under T1203, which involves exploiting vulnerabilities in email servers to gain system access. Network monitoring should be enhanced to detect unusual IMAP command patterns that might indicate exploitation attempts. Additionally, implementing proper access controls and regularly reviewing IMAP server configurations can help reduce the attack surface and prevent unauthorized access to the vulnerable mail server implementation.