Amazon Linux AMI : krb5 (ALAS-2018-1010)

Medium Nessus Plugin ID 117342

Synopsis

The remote Amazon Linux AMI host is missing a security update.

Description

A denial of service flaw was found in MIT Kerberos krb5kdc service. An authenticated attacker could use this flaw to cause krb5kdc to exit with an assertion failure by making an invalid S4U2Self or S4U2Proxy request.(CVE-2017-11368)

An authentication bypass flaw was found in the way krb5's certauth interface handled the validation of client certificates. A remote attacker able to communicate with the KDC could potentially use this flaw to impersonate arbitrary principals under rare and erroneous circumstances.(CVE-2017-7562)

Solution

Run 'yum update krb5' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2018-1010.html

Plugin Details

Severity: Medium

ID: 117342

File Name: ala_ALAS-2018-1010.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2018/09/07

Modified: 2018/09/07

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 4

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P

CVSSv3

Base Score: 6.5

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:krb5-debuginfo, p-cpe:/a:amazon:linux:krb5-devel, p-cpe:/a:amazon:linux:krb5-libs, p-cpe:/a:amazon:linux:krb5-pkinit-openssl, p-cpe:/a:amazon:linux:krb5-server, p-cpe:/a:amazon:linux:krb5-server-ldap, p-cpe:/a:amazon:linux:krb5-workstation, p-cpe:/a:amazon:linux:libkadm5, cpe:/o:amazon:linux

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Patch Publication Date: 2018/09/05

Reference Information

CVE: CVE-2017-11368, CVE-2017-7562

ALAS: 2018-1010