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CVE-2017-11368

Published: 9 August 2017

In MIT Kerberos 5 (aka krb5) 1.7 and later, an authenticated attacker can cause a KDC assertion failure by sending invalid S4U2Self or S4U2Proxy requests.

From the Ubuntu Security Team

It was discovered that Kerberos incorrectly handled certain S4U2Self or S4U2Proxy requests. A remote authenticated attacker could possibly use this issue to cause a denial of service.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
krb5
Launchpad, Ubuntu, Debian
artful Not vulnerable
(1.15.1-2)
bionic Not vulnerable
(1.15.1-2)
cosmic Not vulnerable
(1.15.1-2)
disco Not vulnerable
(1.15.1-2)
eoan Not vulnerable
(1.15.1-2)
focal Not vulnerable
(1.15.1-2)
groovy Not vulnerable
(1.15.1-2)
hirsute Not vulnerable
(1.15.1-2)
trusty
Released (1.12+dfsg-2ubuntu5.4)
upstream
Released (1.15.1-2)
xenial
Released (1.13.2+dfsg-5ubuntu2.1)
zesty Ignored
(end of life)
Patches:
upstream: https://github.com/krb5/krb5/pull/678/commits/a860385dd8fbd239fdb31b347e07f4e6b2fbdcc2
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