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CVE-2016-3120

Published: 1 August 2016

The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.

From the Ubuntu Security Team

It was discovered that Kerberos incorrectly handled certain data structures. A remote authenticated attacker could possibly use this issue to cause a denial of service.

Notes

AuthorNote
ratliff
KDC is not supported for core and touch

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
krb5
Launchpad, Ubuntu, Debian
artful Not vulnerable
(1.14.3+dfsg-2ubuntu1)
bionic Not vulnerable
(1.14.3+dfsg-2ubuntu1)
cosmic Not vulnerable
(1.14.3+dfsg-2ubuntu1)
disco Not vulnerable
(1.14.3+dfsg-2ubuntu1)
eoan Not vulnerable
(1.14.3+dfsg-2ubuntu1)
focal Not vulnerable
(1.14.3+dfsg-2ubuntu1)
groovy Not vulnerable
(1.14.3+dfsg-2ubuntu1)
hirsute Not vulnerable
(1.14.3+dfsg-2ubuntu1)
trusty
Released (1.12+dfsg-2ubuntu5.4)
upstream
Released (1.14.3+dfsg-1)
wily Ignored
(end of life)
xenial
Released (1.13.2+dfsg-5ubuntu2.1)
yakkety Not vulnerable
(1.14.3+dfsg-2ubuntu1)
zesty Not vulnerable
(1.14.3+dfsg-2ubuntu1)
precise Ignored
(end of life)
Patches:
upstream: https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
Binaries built from this source package are in Universe and so are supported by the community.

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H