CVE-2024-6592

WatchGuard Firebox Single Sign-On Agent Protocol Authorization Bypass

Published Sep 25, 2024 CVSS 4.0 · 9.3 Critical EPSS 1.2% KEV · Not listed
Description
An incorrect authorization vulnerability in the protocol communication between the WatchGuard Authentication Gateway (aka Single Sign-On Agent) on Windows and the WatchGuard Single Sign-On Client on Windows and MacOS allows an attacker with network access to forge communications to affected components.

In the event an attacker has already gained network access, they could exploit this vulnerability to retrieve authenticated usernames and group memberships from the Single Sign-On Agent or send arbitrary account and group information to the Single Sign-On Agent for their host. This vulnerability cannot be used by an attacker to gain access to user credentials.

Remediation

Vendor Workaround

An attacker must have already established network access to exploit this vulnerability. WatchGuard recommends using Windows Firewall rules to restrict TCP port 4116 network access to the Single Sign-On Client to only allow connections from the Authentication Gateway (SSO Agent), and restricting TCP port 4114 network access to the Authentication Gateway to only allow connections from the Firebox. Windows administrators can use Group Policy objects to add Windows firewall rules to their endpoints.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-47657 Incorrect Authorization vulnerability in the protocol communication between the WatchGuard Authentication Gateway (aka Single Sign-On Agent) on Windows and the WatchGuard Single Sign-On Client on Windows and MacOS allows Authentication Bypass.This issue affects the Authentication Gateway: through 12.10.2; Windows Single Sign-On Client: through 12.7; MacOS Single Sign-On Client: through 12.5.4.
History
Type Values Removed Values Added
Description Incorrect Authorization vulnerability in the protocol communication between the WatchGuard Authentication Gateway (aka Single Sign-On Agent) on Windows and the WatchGuard Single Sign-On Client on Windows and MacOS allows Authentication Bypass.This issue affects the Authentication Gateway: through 12.10.2; Windows Single Sign-On Client: through 12.7; MacOS Single Sign-On Client: through 12.5.4. An incorrect authorization vulnerability in the protocol communication between the WatchGuard Authentication Gateway (aka Single Sign-On Agent) on Windows and the WatchGuard Single Sign-On Client on Windows and MacOS allows an attacker with network access to forge communications to affected components. In the event an attacker has already gained network access, they could exploit this vulnerability to retrieve authenticated usernames and group memberships from the Single Sign-On Agent or send arbitrary account and group information to the Single Sign-On Agent for their host. This vulnerability cannot be used by an attacker to gain access to user credentials.
First Time appeared Watchguard sso Agent
Watchguard sso Client
CPEs cpe:2.3:a:watchguard:sso_agent:*:*:*:*:*:*:*:*
cpe:2.3:a:watchguard:sso_client:*:*:*:*:*:*:*:*
Vendors & Products Watchguard sso Agent
Watchguard sso Client
References
Metrics cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}

Type Values Removed Values Added
Weaknesses CWE-306
Type Values Removed Values Added
Metrics epss

{'score': 0.01273}

epss

{'score': 0.01378}

Type Values Removed Values Added
First Time appeared Watchguard
Watchguard authentication Gateway
Watchguard single Sign-on Client
CPEs cpe:2.3:a:watchguard:authentication_gateway:*:*:*:*:*:*:*:*
cpe:2.3:a:watchguard:single_sign-on_client:*:*:*:*:*:macos:*:*
cpe:2.3:a:watchguard:single_sign-on_client:*:*:*:*:*:windows:*:*
Vendors & Products Watchguard
Watchguard authentication Gateway
Watchguard single Sign-on Client
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Incorrect Authorization vulnerability in the protocol communication between the WatchGuard Authentication Gateway (aka Single Sign-On Agent) on Windows and the WatchGuard Single Sign-On Client on Windows and MacOS allows Authentication Bypass.This issue affects the Authentication Gateway: through 12.10.2; Windows Single Sign-On Client: through 12.7; MacOS Single Sign-On Client: through 12.5.4.
Title WatchGuard Firebox Single Sign-On Agent Protocol Authorization Bypass
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WatchGuard
Published
Updated
Aug 7, 2026, 11:46 PM
Reserved
Jul 9, 2024, 2:09 AM
Status
Modified
Published
Sep 25, 2024, 12:15 PM
Modified
Aug 8, 2026, 12:16 AM