Jeffrey Altman, Viktor Dukhovni, and Nicolas Williams reported that Heimdal, an implementation of Kerberos 5 that aims to be compatible with MIT Kerberos, trusts metadata taken from the unauthenticated plaintext (Ticket), rather than the authenticated and encrypted KDC response. A

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Debian Security Advisory DSA-3912-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                     Salvatore Bonaccorso
July 16, 2017                         https://www.debian.org/security/faq
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Package        : heimdal
CVE ID         : CVE-2017-11103
Debian Bug     : 868208

Jeffrey Altman, Viktor Dukhovni, and Nicolas Williams reported that
Heimdal, an implementation of Kerberos 5 that aims to be compatible with
MIT Kerberos, trusts metadata taken from the unauthenticated plaintext
(Ticket), rather than the authenticated and encrypted KDC response. A
man-in-the-middle attacker can use this flaw to impersonate services to
the client.

See https://orpheus-lyre.info/ for details.

For the oldstable distribution (jessie), this problem has been fixed
in version 1.6~rc2+dfsg-9+deb8u1.

For the stable distribution (stretch), this problem has been fixed in
version 7.1.0+dfsg-13+deb9u1.

For the unstable distribution (sid), this problem has been fixed in
version 7.4.0.dfsg.1-1.

We recommend that you upgrade your heimdal 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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