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CVE-2017-11103

Publication date 13 July 2017

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.1 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
heimdal 17.04 zesty
Fixed 7.1.0+dfsg-9ubuntu1.1
16.10 yakkety
Fixed 1.7~git20150920+dfsg-4ubuntu1.16.10.1
16.04 LTS xenial
Fixed 1.7~git20150920+dfsg-4ubuntu1.16.04.1
14.04 LTS trusty
Fixed 1.6~git20131207+dfsg-1ubuntu1.2
samba 17.04 zesty
Fixed 2:4.5.8+dfsg-0ubuntu0.17.04.4
16.10 yakkety
Fixed 2:4.4.5+dfsg-2ubuntu5.8
16.04 LTS xenial
Fixed 2:4.3.11+dfsg-0ubuntu0.16.04.9
14.04 LTS trusty
Fixed 2:4.3.11+dfsg-0ubuntu0.14.04.10

Severity score breakdown

Parameter Value
Base score 8.1 · High
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H