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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
precise
Released (1.6~git20120311.dfsg.1-2ubuntu0.2)
trusty
Released (1.6~git20131207+dfsg-1ubuntu1.2)
upstream Needs triage

xenial
Released (1.7~git20150920+dfsg-4ubuntu1.16.04.1)
yakkety
Released (1.7~git20150920+dfsg-4ubuntu1.16.10.1)
zesty
Released (7.1.0+dfsg-9ubuntu1.1)
samba
Launchpad, Ubuntu, Debian
precise
Released (2:3.6.25-0ubuntu0.12.04.12)
trusty
Released (2:4.3.11+dfsg-0ubuntu0.14.04.10)
upstream Needs triage

xenial
Released (2:4.3.11+dfsg-0ubuntu0.16.04.9)
yakkety
Released (2:4.4.5+dfsg-2ubuntu5.8)
zesty
Released (2:4.5.8+dfsg-0ubuntu0.17.04.4)