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AlmaLinux 9 : openssh (ALSA-2023:2645)

medium Nessus Plugin ID 175623

Synopsis

The remote AlmaLinux host is missing a security update.

Description

The remote AlmaLinux 9 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2023:2645 advisory.

 - OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling.
 This is fixed in OpenSSH 9.2. The double free can be leveraged, by an unauthenticated remote attacker in the default configuration, to jump to any location in the sshd address space. One third-party report states remote code execution is theoretically possible. (CVE-2023-25136)

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 affected packages.

See Also

https://errata.almalinux.org/9/ALSA-2023-2645.html

Plugin Details

Severity: Medium

ID: 175623

File Name: alma_linux_ALSA-2023-2645.nasl

Version: 1.0

Type: local

Published: 5/14/2023

Updated: 5/14/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.0

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.8

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

CVSS Score Source: CVE-2023-25136

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

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

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

Vulnerability Information

CPE: p-cpe:/a:alma:linux:openssh, p-cpe:/a:alma:linux:openssh-askpass, p-cpe:/a:alma:linux:openssh-clients, p-cpe:/a:alma:linux:openssh-keycat, p-cpe:/a:alma:linux:openssh-server, p-cpe:/a:alma:linux:pam_ssh_agent_auth, cpe:/o:alma:linux:9, cpe:/o:alma:linux:9::appstream, cpe:/o:alma:linux:9::baseos, cpe:/o:alma:linux:9::crb, cpe:/o:alma:linux:9::highavailability, cpe:/o:alma:linux:9::nfv, cpe:/o:alma:linux:9::realtime, cpe:/o:alma:linux:9::resilientstorage, cpe:/o:alma:linux:9::sap, cpe:/o:alma:linux:9::sap_hana, cpe:/o:alma:linux:9::supplementary

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/9/2023

Vulnerability Publication Date: 2/3/2023

Reference Information

CVE: CVE-2023-25136

CWE: 401

IAVA: 2023-A-0073-S