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Fortinet FortiWeb OpenSSH regreSSHion Attack (CVE-2024-6387) (FG-IR-24-258)

critical Nessus Plugin ID 209711

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Synopsis

Fortinet Firewall is missing one or more security-related updates.

Description

The version of FortiWeb installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the FG-IR-24-258 advisory.

 - A race condition in sshd affecting versions between 8.5p1 and 9.7p1 (inclusive) may allow arbitrary code execution with root privileges. Successful exploitation has been demonstrated on 32-bit Linux/glibc systems with ASLR. According to OpenSSH, the attack has been tested under lab conditions and requires on average 6-8 hours of continuous connections up to the maximum the server will accept. Exploitation on 64-bit systems is believed to be possible but has not been demonstrated at this time. (CVE-2024-6387)

 - A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period. (CVE-2024-6387)

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

Solution

Upgrade to FortiWeb version 7.2.10 / 7.4.5 / 7.6.1 or later.

See Also

https://www.fortiguard.com/psirt/FG-IR-24-258

https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt

https://www.openssh.com/txt/release-9.8

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-6387

Plugin Details

Severity: Critical

ID: 209711

File Name: fortiweb_FG-IR-24-258.nasl

Version: 1.3

Type: local

Family: Firewalls

Published: 10/25/2024

Updated: 12/19/2024

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 6

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

CVSS Score Source: CVE-2024-6387

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 8.2

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/a:fortinet:fortiweb

Required KB Items: Settings/ParanoidReport, Host/Fortigate/model, Host/Fortigate/version

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 5/9/2024

Reference Information

CVE: CVE-2024-6387