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GLSA-202004-08 : libssh: Denial of service

medium Nessus Plugin ID 135426

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Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-202004-08 (libssh: Denial of service)

 It was discovered that libssh could crash when AES-CTR ciphers are used.
 Impact :

 A remote attacker running a malicious client or server could possibly crash the counterpart implemented with libssh and cause a Denial of Service condition.
 Workaround :

 Disable AES-CTR ciphers. If you implement a server using libssh it is recommended to use a prefork model so each session runs in an own process.

Solution

All libssh users should upgrade to the latest version:
 # emerge --sync # emerge --ask --oneshot --verbose '>=net-libs/libssh-0.9.4'

See Also

https://security.gentoo.org/glsa/202004-08

Plugin Details

Severity: Medium

ID: 135426

File Name: gentoo_GLSA-202004-08.nasl

Version: 1.5

Type: local

Published: 4/14/2020

Updated: 5/27/2021

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:gentoo:linux:libssh, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Ease: No known exploits are available

Patch Publication Date: 4/10/2020

Vulnerability Publication Date: 4/13/2020

Reference Information

CVE: CVE-2020-1730

GLSA: 202004-08

IAVA: 2020-A-0203