CVE-2018-20217

2018-12-2600:00:00

ubuntu.com

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

3.5 Low

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:S/C:N/I:N/A:P

0.003 Low

EPSS

Percentile

69.5%

JSON

A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5
(aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an
older encryption type (single-DES, triple-DES, or RC4), the attacker can
crash the KDC by making an S4U2Self request.

Bugs

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchkrb5< 1.16-2ubuntu0.3UNKNOWN
ubuntu14.04noarchkrb5< 1.12+dfsg-2ubuntu5.4+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchkrb5< 1.13.2+dfsg-5ubuntu2.2+esm3) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	krb5	< 1.16-2ubuntu0.3	UNKNOWN
ubuntu	14.04	noarch	krb5	< 1.12+dfsg-2ubuntu5.4+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	16.04	noarch	krb5	< 1.13.2+dfsg-5ubuntu2.2+esm3) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN