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Amazon Linux AMI : krb5 (ALAS-2015-624)

medium Nessus Plugin ID 87350

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Synopsis

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

Description

A flaw was found in the OTP kdcpreauth module of MIT Kerberos. A remote attacker could use this flaw to bypass the requires_preauth flag on a client principal and obtain a ciphertext encrypted in the principal's long-term key. This ciphertext could be used to conduct an off-line dictionary attack against the user's password.

It was found that the krb5_read_message() function of MIT Kerberos did not correctly sanitize input, and could create invalid krb5_data objects. A remote, unauthenticated attacker could use this flaw to crash a Kerberos child process via a specially crafted request.

Solution

Run 'yum update krb5' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2015-624.html

Plugin Details

Severity: Medium

ID: 87350

File Name: ala_ALAS-2015-624.nasl

Version: 2.4

Type: local

Agent: unix

Published: 12/15/2015

Updated: 4/18/2018

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5.8

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

Vulnerability Information

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

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

Patch Publication Date: 12/14/2015

Reference Information

CVE: CVE-2014-5355, CVE-2015-2694

ALAS: 2015-624