CVE-2017-11103

Published: 13 July 2017

Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre attacks because it obtains service-principal names in a way that violates the Kerberos 5 protocol specification. In _krb5_extract_ticket() the KDC-REP service name must be obtained from the encrypted version stored in 'enc_part' instead of the unencrypted version stored in 'ticket'. Use of the unencrypted version provides an opportunity for successful server impersonation and other attacks. NOTE: this CVE is only for Heimdal and other products that embed Heimdal code; it does not apply to other instances in which this part of the Kerberos 5 protocol specification is violated.

Priority

Medium

CVSS 3 base score: 8.1

Status

Package Release Status
heimdal
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 16.04 LTS (Xenial Xerus)
Released (1.7~git20150920+dfsg-4ubuntu1.16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (1.6~git20131207+dfsg-1ubuntu1.2)
Ubuntu 12.04 ESM (Precise Pangolin)
Released (1.6~git20120311.dfsg.1-2ubuntu0.2)
samba
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 16.04 LTS (Xenial Xerus)
Released (2:4.3.11+dfsg-0ubuntu0.16.04.9)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (2:4.3.11+dfsg-0ubuntu0.14.04.10)
Ubuntu 12.04 ESM (Precise Pangolin)
Released (2:3.6.25-0ubuntu0.12.04.12)