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Fortinet FortiOS 5.0.x < 5.0.12 / 5.2.x < 5.2.4 Weak Ciphers (FG-IR-15-021)

medium Nessus Plugin ID 85911

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Synopsis

The remote host supports weak ciphers

Description

The remote host is running a version of Fortinet FortiOS that is 5.0.x prior to 5.0.12 or 5.2.x prior 5.2.4. It is, therefore, affected by a flaw when connecting to a FortiGuard server via TLS due to the support of weak ciphers such as anonymous, export, and RC4. A man-in-the-middle attacker can exploit this to downgrade the TLS cipher suite and conduct attacks on the TLS connection.

Solution

Upgrade to Fortinet FortiOS 5.0.12 / 5.2.4 or later.

See Also

https://fortiguard.com/psirt/FG-IR-15-021

Plugin Details

Severity: Medium

ID: 85911

File Name: fortios_FG-IR-15-021.nasl

Version: 1.6

Type: local

Family: Firewalls

Published: 9/11/2015

Updated: 9/16/2022

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.0

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2015-2323

Vulnerability Information

CPE: cpe:/o:fortinet:fortios

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/24/2015

Vulnerability Publication Date: 7/24/2015

Reference Information

CVE: CVE-2015-2323

BID: 76047