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FreeBSD : Client/server denial of service when handling AES-CTR ciphers (3d7dfd63-823b-11ea-b3a8-240a644dd835)

medium Nessus Plugin ID 135795

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The libssh team reports (originally reported by Yasheng Yang from Google) :

A malicious client or server could crash the counterpart implemented with libssh AES-CTR ciphers are used and don't get fully initialized.
It will crash when it tries to cleanup the AES-CTR ciphers when closing the connection.

Solution

Update the affected packages.

See Also

https://www.libssh.org/security/advisories/CVE-2020-1730.txt

http://www.nessus.org/u?fb05dade

Plugin Details

Severity: Medium

ID: 135795

File Name: freebsd_pkg_3d7dfd63823b11eab3a8240a644dd835.nasl

Version: 1.4

Type: local

Published: 4/21/2020

Updated: 7/14/2020

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2020-1730

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:libssh, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 4/19/2020

Vulnerability Publication Date: 1/25/2020

Reference Information

CVE: CVE-2020-1730

IAVA: 2020-A-0203