CVE-2024-6592: WatchGuard Firebox Single Sign-On Agent Protocol Authorization Bypass
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.
Security readout for executives and security teams
Plain-English summary
An attacker already able to reach the WatchGuard SSO network components could impersonate trusted communications. This may expose authenticated usernames and group memberships or let the attacker submit false account and group data for their host. The issue does not disclose user credentials, but manipulated identity information could undermine access decisions.
Executive priority
Treat as an urgent identity-control issue where WatchGuard SSO is deployed. Prioritize environments where untrusted, user, wireless, or compromised segments can reach SSO components. This is critical by score, but urgency depends materially on deployment presence and network reachability. Require owners to confirm affected versions and vendor remediation promptly.
Technical view
CVE-2024-6592 is a missing or incorrect protocol authorization weakness between the Windows WatchGuard Authentication Gateway/SSO Agent and Windows or macOS SSO Clients. Network-reachable, unauthenticated attackers can forge protocol messages, affecting confidentiality and integrity without reported availability impact. The supplied CVSS 4.0 score is 9.3 and maps to CWE-306.
Likely exposure
Exposure requires network access to the affected SSO communication path. Organizations using WatchGuard SSO Agent and SSO Client components should investigate. The supplied version data lists 12.0 but marks entries unaffected, so the exact vulnerable release range is unclear from this bundle and must be confirmed through WatchGuard guidance.
Exploitation context
The bundle does not establish active exploitation, and the CVE is not listed as KEV. Exploitation nevertheless appears low-complexity once an attacker has network reachability: no privileges or user interaction are indicated. Impact is limited to SSO identity and group information; the cited description explicitly says credentials cannot be obtained through this vulnerability.
Researcher notes
The core security boundary is protocol authorization, not credential storage. Investigation should focus on forged client-to-agent communications, disclosure of authenticated identity metadata, and injected host account or group assertions. Avoid assuming authentication bypass directly grants firewall access; the bundle establishes identity-data manipulation but does not describe downstream policy behavior. Exact affected versions and fixes remain insufficiently specified here.
Mitigation direction
Review WatchGuard advisories and apply the vendor-supported update or mitigation for deployed SSO components.
Restrict SSO protocol access to explicitly authorized clients and trusted network segments.
Reduce unnecessary network paths to the Windows SSO Agent and Authentication Gateway.
Monitor SSO identity and group submissions for unexpected hosts, accounts, or membership changes.
Validation and detection
Inventory WatchGuard SSO Agents and Clients, recording operating systems and exact installed versions.
Confirm affected status against WatchGuard guidance because the supplied version metadata is internally inconsistent.
Map which hosts and network segments can reach the SSO communication interfaces.
Review SSO logs for unusual username lookups, group queries, or host identity updates.
After remediation, verify unauthorized network sources cannot communicate with the SSO components.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
cwe · medium confidence lookup
CWE-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
1CVSS vectors
3Timeline events
1ADP providers
4Source links
SSVC decision data
CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total
CVSS vector scores
1 official score
We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
CWE-306 · source CWE mapping
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.