Transport Neutral Encapsulation Format (TNEF) is a proprietary e-mail attachment format used by Microsoft Outlook and Microsoft Exchange Server. A plugin for Evolution exists that provides basic support for TNEF encoded e-mails. This plugin uses the ytnef library (libytnef) for processing TNEF messages. It borrows code from the ytnef program, which is a program to work with procmail to decode TNEF streams (winmail.dat attachments). These applications share code and are, because of this, both affected by the issues described in this document. yTNEF & the Evolution TNEF Attachment decoder plugin are affected by several directory traversal and buffer overflow vulnerabilities. The directory traversal vulnerabilities allow attackers to overwrite or create local files with the privileges of the target user. Exploiting the buffer overflow vulnerabilities allows for arbitrary code execution with the privileges of the target user.
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