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
Author | Note |
---|---|
ratliff | KDC is not supported for core and touch |
Priority
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 |