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Amazon Linux AMI : openssh (ALAS-2018-1018)

medium Nessus Plugin ID 109700

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Synopsis

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

Description

Improper write operations in readonly mode allow for zero-length file creation

The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write operations in readonly mode, which allows attackers to create zero-length files.(CVE-2017-15906)

Solution

Run 'yum update openssh' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2018-1018.html

Plugin Details

Severity: Medium

ID: 109700

File Name: ala_ALAS-2018-1018.nasl

Version: 1.1

Type: local

Agent: unix

Published: 5/11/2018

Updated: 5/11/2018

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

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

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

CVSS v3

Risk Factor: Medium

Base Score: 5.3

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:openssh, p-cpe:/a:amazon:linux:openssh-cavs, p-cpe:/a:amazon:linux:openssh-clients, p-cpe:/a:amazon:linux:openssh-debuginfo, p-cpe:/a:amazon:linux:openssh-keycat, p-cpe:/a:amazon:linux:openssh-ldap, p-cpe:/a:amazon:linux:openssh-server, p-cpe:/a:amazon:linux:pam_ssh_agent_auth, cpe:/o:amazon:linux

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

Patch Publication Date: 5/10/2018

Reference Information

CVE: CVE-2017-15906

ALAS: 2018-1018