It was discovered that tnef, a tool used to unpack MIME attachments of type "application/ms-tnef", did not correctly validate its input. An attacker could exploit this by tricking a user into opening a malicious attachment, which would result in a denial-of-service by

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Debian Security Advisory DSA-3869-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                       Sebastien Delafond
June 01, 2017                         https://www.debian.org/security/faq
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Package        : tnef
CVE ID         : CVE-2017-8911
Debian Bug     : 862442

It was discovered that tnef, a tool used to unpack MIME attachments of
type "application/ms-tnef", did not correctly validate its input. An
attacker could exploit this by tricking a user into opening a
malicious attachment, which would result in a denial-of-service by
application crash.

For the stable distribution (jessie), this problem has been fixed in
version 1.4.9-1+deb8u3.

For the unstable distribution (sid), this problem has been fixed in
version 1.4.12-1.2.

We recommend that you upgrade your tnef packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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