CVE-2006-0448 in SPA-PRO Mail @Solomon
Summary
by MITRE
Multiple directory traversal vulnerabilities in (1) EPSTIMAP4S.EXE and (2) SPA-IMAP4S.EXE in the IMAP service in E-Post Mail 4.05 and SPA-PRO Mail 4.05 allow remote attackers to (a) list arbitrary directories or cause a denial of service via the LIST command; or create arbitrary files via the (b) APPEND, (c) COPY, or (d) RENAME commands.
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Analysis
by VulDB Data Team • 08/02/2017
The CVE-2006-0448 vulnerability represents a critical directory traversal flaw affecting email server implementations within the E-Post Mail 4.05 and SPA-PRO Mail 4.05 software suites. These vulnerabilities specifically target the IMAP service components EPSTIMAP4S.EXE and SPA-IMAP4S.EXE, which are responsible for handling internet message access protocol communications. The flaw stems from inadequate input validation and sanitization within the IMAP command processing logic, allowing malicious actors to exploit the service through standard IMAP commands. This vulnerability classifies under CWE-22, which specifically addresses directory traversal or path traversal issues that enable unauthorized access to file system resources beyond the intended scope.
The technical exploitation of this vulnerability occurs through multiple attack vectors within the IMAP protocol implementation. Attackers can leverage the LIST command to enumerate arbitrary directories on the target system, effectively bypassing normal file system access controls and potentially discovering sensitive system information. Additionally, the vulnerability permits remote code execution through the APPEND, COPY, and RENAME commands, enabling attackers to create arbitrary files in unauthorized locations. The underlying flaw allows attackers to manipulate file paths through specially crafted command parameters, circumventing standard security boundaries and file system permissions. This type of vulnerability demonstrates a fundamental weakness in input validation mechanisms that should have prevented arbitrary path manipulation within the IMAP service.
The operational impact of CVE-2006-0448 extends beyond simple information disclosure to encompass full system compromise potential. The ability to list arbitrary directories provides attackers with reconnaissance capabilities to map the target system's file structure, potentially identifying sensitive files, configuration data, or system binaries. More critically, the capability to create arbitrary files through APPEND, COPY, and RENAME commands opens pathways for persistent access, privilege escalation, or system corruption. This vulnerability directly enables the execution of the ATT&CK technique T1078.004 - Valid Accounts, as attackers can leverage the IMAP service to establish persistent access to the compromised system. The denial of service aspect of this vulnerability can also be leveraged to disrupt legitimate email services, causing business continuity issues and potentially masking more sophisticated attacks.
Mitigation strategies for this vulnerability must address both immediate protection and long-term architectural improvements. Organizations should implement network segmentation to limit access to IMAP services, particularly restricting access to internal networks where possible. The most effective immediate solution involves applying vendor patches or upgrading to versions that properly sanitize input parameters and validate file paths before processing IMAP commands. System administrators should also implement strict input validation rules within the IMAP service configuration, rejecting any commands containing suspicious path traversal sequences such as double dots or forward slashes. The implementation of principle of least privilege access controls and regular security audits of email server configurations can help prevent exploitation of similar vulnerabilities. Additionally, network monitoring solutions should be configured to detect unusual IMAP command patterns that might indicate exploitation attempts, particularly focusing on LIST commands that request directory enumeration beyond normal operational boundaries. This vulnerability highlights the importance of secure coding practices and input validation in network services, particularly those handling user-supplied data through protocol commands.