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RHEL 8 : libssh (RHSA-2021:4387)

medium Nessus Plugin ID 155225

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Synopsis

The remote Red Hat host is missing a security update for libssh.

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:4387 advisory.

 libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

 Security Fix(es):

 * libssh: NULL pointer dereference in sftpserver.c if ssh_buffer_new returns NULL (CVE-2020-16135)

 For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

 Additional Changes:

 For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL libssh package based on the guidance in RHSA-2021:4387.

See Also

https://bugzilla.redhat.com/show_bug.cgi?id=1862456

http://www.nessus.org/u?2c9adb7c

http://www.nessus.org/u?7240878e

https://access.redhat.com/security/updates/classification/#low

https://access.redhat.com/errata/RHSA-2021:4387

Plugin Details

Severity: Medium

ID: 155225

File Name: redhat-RHSA-2021-4387.nasl

Version: 1.10

Type: local

Agent: unix

Published: 11/11/2021

Updated: 11/7/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

Vendor

Vendor Severity: Low

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.4

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

CVSS Score Source: CVE-2020-16135

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.3

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:libssh, p-cpe:/a:redhat:enterprise_linux:libssh-devel, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:libssh-config

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/9/2021

Vulnerability Publication Date: 7/29/2020

Reference Information

CVE: CVE-2020-16135

CWE: 476

RHSA: 2021:4387