Sebastian Vandersee has reported a vulnerability in MailMarshal, which can be exploited by malicious people to compromise a vulnerable system.
An input validation error when unpacking tar archives can be exploited to extract files to arbitrary directories on the system (e.g. the "All Users" startup folder) via a file with a filename containing directory traversal modifiers in a tar archive.
The vulnerability is reported in version 126.96.36.19953 and reportedly also affects MailMarshal SMTP 5.x, 2006, and MailMarshal Exchange 5.x.
Solution: Apply patches (see vendor advisory for details).
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Subject: MailMarshal tar Archive Directory Traversal
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