GLSA-202011-17 : MIT Kerberos 5: Denial of service

high Nessus Plugin ID 142930
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Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-202011-17 (MIT Kerberos 5: Denial of service)

It was discovered that MIT Kerberos network authentication system, krb5, did not properly handle ASN.1-encoded Kerberos messages.
Impact :

A remote attacker could send a specially crafted Kerberos message, possibly resulting in a Denial of Service condition.
Workaround :

There is no known workaround at this time.

Solution

All MIT Kerberos 5 users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=app-crypt/mit-krb5-1.18.2-r2'

See Also

https://security.gentoo.org/glsa/202011-17

Plugin Details

Severity: High

ID: 142930

File Name: gentoo_GLSA-202011-17.nasl

Version: 1.3

Type: local

Published: 11/17/2020

Updated: 11/20/2020

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2020-28196

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:mit-krb5, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Ease: No known exploits are available

Patch Publication Date: 11/16/2020

Vulnerability Publication Date: 11/6/2020

Reference Information

CVE: CVE-2020-28196

GLSA: 202011-17