CyberSecBulletin
CVE-2024-50565NVD status: Analyzed

FortiOS: Channel Accessible by Non-Endpoint

Published Updated By the CyberSecBulletin desk

CVE-2024-50565 is a high-severity channel accessible by non-endpoint vulnerability in FortiOS from Fortinet, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected FortiOS versions: 7.4.0 through 7.4.4; 7.2.0 through 7.2.8; 7.0.0 through 7.0.15, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.41% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Fortiproxy to 7.0.16 or 7.2.10 or 7.4.3, whichever matches your release line, or a later version.
  2. Update Fortimanager to 6.2.14 or 6.4.15 or 7.0.12 or 7.2.5, whichever matches your release line, or a later version.
  3. Read the advisory on fortiguard.fortinet.com for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
  5. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
FortinetFortiOS7.4.0 through 7.4.4; 7.2.0 through 7.2.8; 7.0.0 through 7.0.15; 6.4.0 through 6.4.16; 6.2.0 through 6.2.16Not stated
FortinetFortiVoice7.0.0 through 7.0.2; 6.4.0 through 6.4.8; 6.0.0 through 6.0.12Not stated
FortinetFortiWeb7.4.0 through 7.4.2; 7.2.0 through 7.2.11; 7.0.0 through 7.0.11Not stated
FortinetFortiAnalyzer7.4.0 through 7.4.2; 7.2.0 through 7.2.4; 7.0.0 through 7.0.11; 6.4.0 through 6.4.14; 6.2.0 through 6.2.13Not stated
FortinetFortiproxy2.0.0 up to, but not including, 7.0.16; 7.2.0 up to, but not including, 7.2.10; 7.4.0 up to, but not including, 7.4.37.0.16, 7.2.10, 7.4.3
FortinetFortimanager6.2.0 up to, but not including, 6.2.14; 6.4.0 up to, but not including, 6.4.15; 7.0.0 up to, but not including, 7.0.12; 7.2.0 up to, but not including, 7.2.5; 7.4.0 up to, but not including, 7.4.36.2.14, 6.4.15, 7.0.12, 7.2.5, 7.4.3

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.13.1LowCNA (fortinet.com)
CVSS 3.17.5HighNVD

Official description

A improper restriction of communication channel to intended endpoints vulnerability [CWE-923] in Fortinet FortiOS version 7.4.0 through 7.4.3, 7.2.0 through 7.2.7, 7.0.0 through 7.0.14, 6.4.0 through 6.4.15 and 6.2.0 through 6.2.16, Fortinet FortiProxy version 7.4.0 through 7.4.2, 7.2.0 through 7.2.9, 7.0.0 through 7.0.15 and 2.0.0 through 2.0.14, Fortinet FortiManager version 7.4.0 through 7.4.2, 7.2.0 through 7.2.4, 7.0.0 through 7.0.11, 6.4.0 through 6.4.14 and 6.2.0 through 6.2.13, Fortinet FortiAnalyzer version 7.4.0 through 7.4.2, 7.2.0 through 7.2.4, 7.0.0 through 7.0.11, 6.4.0 through 6.4.14 and 6.2.0 through 6.2.13, Fortinet FortiVoice version 7.0.0 through 7.0.2, 6.4.0 through 6.4.8 and 6.0.0 through 6.0.12 and Fortinet FortiWeb version 7.4.0 through 7.4.2, 7.2.0 through 7.2.10, 7.0.0 through 7.0.10 allows an unauthenticated attacker in a man-in-the-middle position to impersonate the management device (FortiCloud server or/and in certain conditions, FortiManager), via intercepting the FGFM authentication request between the management device and the managed device

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Channel Accessible by Non-Endpoint

The product does not adequately verify the identity of actors at both ends of a communication channel, or does not adequately ensure the integrity of the channel, in a way that allows the channel to be accessed or influenced by an actor that is not an endpoint.

How developers prevent this class of flaw

  • In order to establish secure communication between two parties, it is often important to adequately verify the identity of entities at each end of the communication channel. Always fully authenticate both ends of any communications channel.
  • Adhere to the principle of complete mediation.
  • A certificate binds an identity to a cryptographic key to authenticate a communicating party. Often, the certificate takes the encrypted form of the hash of the identity of the subject, the public key, and information such as time of issue or expiration using the issuer's private key. The certificate can be validated by deciphering the certificate with the issuer's public key. See also X.509 certificate signature chains and the PGP certification structure.

More Channel Accessible by Non-Endpoint vulnerabilities (CWE-300)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in FortiOS

All FortiOS vulnerabilities

Recent Channel Accessible by Non-Endpoint vulnerabilities

Spotted an error? Tell us.