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USN-4524-1: TNEF vulnerabilities

21 September 2020

TNEF could be made to crash or write arbitrary files to the filesystem.



  • tnef - Tool to unpack MIME application/ms-tnef attachments


Paul Dreik discovered that TNEF incorrectly handled filenames. If a user
were tricked into opening a specially crafted email attachment, an
attacker could possibly use this issue to write arbitrary files to the
filesystem or cause TNEF crash, resulting in a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04

In general, a standard system update will make all the necessary changes.