CVE-2006-5487 in MailMarshal SMTP
Summary
by MITRE
Directory traversal vulnerability in Marshal MailMarshal SMTP 5.x, 6.x, and 2006, and MailMarshal for Exchange 5.x, allows remote attackers to write arbitrary files via ".." sequences in filenames in an ARJ compressed archive.
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Analysis
by VulDB Data Team • 04/27/2026
The vulnerability identified as CVE-2006-5487 represents a critical directory traversal flaw affecting multiple versions of Marshal MailMarshal SMTP and MailMarshal for Exchange products. This security weakness stems from inadequate input validation within the archive processing functionality, specifically when handling ARJ compressed archives containing filenames with ".." sequences. The flaw enables remote attackers to manipulate file paths and write arbitrary files to unintended locations on the target system, potentially leading to arbitrary code execution or system compromise.
The technical implementation of this vulnerability occurs during the decompression process of ARJ archives where the software fails to properly sanitize or validate filenames before extracting them to the filesystem. When an attacker crafts a malicious ARJ archive containing filenames with directory traversal sequences such as "../", the vulnerable software interprets these sequences as legitimate path navigation instructions rather than malicious input. This improper handling allows the attacker to traverse the directory structure and write files to locations outside the intended extraction directory, effectively bypassing normal file access controls and security boundaries.
From an operational perspective, this vulnerability presents significant risks to email server environments that process untrusted email content or archives. Attackers can exploit this weakness to upload malicious files such as backdoor executables, configuration scripts, or other payloads that could establish persistent access to the compromised system. The impact extends beyond simple file manipulation as successful exploitation could lead to complete system compromise, data exfiltration, or further lateral movement within the network. The vulnerability affects multiple product versions including MailMarshal SMTP 5.x, 6.x, and 2006, as well as MailMarshal for Exchange 5.x, indicating a widespread issue across the product line.
The vulnerability aligns with CWE-22, which specifically addresses "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", and demonstrates characteristics consistent with ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1078.002 for Valid Accounts. Organizations using affected MailMarshal products face potential exploitation through email-based attacks where attackers send specially crafted emails containing malicious ARJ archives. The attack vector requires remote access and does not necessitate authentication, making it particularly dangerous for email servers that process external communications. Mitigation strategies should include immediate patching of affected software versions, implementing strict input validation for archive processing, and deploying network-based intrusion detection systems to monitor for suspicious file extraction patterns. Additionally, administrators should consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts, while also establishing proper monitoring for unauthorized file creation or modification in critical system directories.