Summary
Semantic MediaWiki contains a missing authorization vulnerability in the smwtask API module that can allow unauthenticated users to run queued jobs and trigger store updates. When the affected API operations are publicly reachable, attackers may execute jobs repeatedly, access sysop-protected update functionality, disclose page titles, or exhaust application resources.
Semantic MediaWiki contains a missing authorization vulnerability in the smwtask API module that can allow unauthenticated users to run queued jobs and trigger store updates. When the affected API operations are publicly reachable, attackers may execute jobs repeatedly, access sysop-protected update functionality, disclose page titles, or exhaust application resources.
Affected context
The issue affects Semantic MediaWiki deployments using the vulnerable smwtask API behavior, particularly where anonymous users can obtain and use a public CSRF token with the run-joblist operation or invoke update actions associated with protected pages. Risk depends on API exposure, authorization configuration, queued-job handling, and the resources available to the MediaWiki installation.
The issue affects Semantic MediaWiki deployments using the vulnerable smwtask API behavior, particularly where anonymous users can obtain and use a public CSRF token with the run-joblist operation or invoke update actions associated with protected pages. Risk depends on API exposure, authorization configuration, queued-job handling, and the resources available to the MediaWiki installation.
Exploit preconditions
- Attack surface: The Semantic MediaWiki
smwtaskAPI module. - Required access: No authenticated account is generally required when the affected API operations and anonymous CSRF token are publicly available.
- Trigger point: Requests to
run-joblistor to theupdateoperation for pages that should require sysop authorization. - Why exploitation is possible: Authorization checks do not consistently restrict job execution or protected update actions, allowing anonymous requests to reach privileged functionality and potentially submit unbounded work.
- Attack surface: The Semantic MediaWiki
smwtaskAPI module. - Required access: No authenticated account is generally required when the affected API operations and anonymous CSRF token are publicly available.
- Trigger point: Requests to
run-joblistor to theupdateoperation for pages that should require sysop authorization. - Why exploitation is possible: Authorization checks do not consistently restrict job execution or protected update actions, allowing anonymous requests to reach privileged functionality and potentially submit unbounded work.
Why this happens
The underlying flaw is a missing or incomplete authorization check in an API module that exposes operations capable of executing queued jobs and updating stored data. The application treats possession of a public anonymous CSRF token as sufficient for actions that also require authorization, rather than enforcing server-side permissions for each operation and target. This maps to CWE-862, Missing Authorization, where a sensitive function lacks an effective access-control decision.
The underlying flaw is a missing or incomplete authorization check in an API module that exposes operations capable of executing queued jobs and updating stored data. The application treats possession of a public anonymous CSRF token as sufficient for actions that also require authorization, rather than enforcing server-side permissions for each operation and target. This maps to CWE-862, Missing Authorization, where a sensitive function lacks an effective access-control decision.
Potential impact
- Unauthenticated users may execute arbitrary supported queued job types.
- Attackers could trigger jobs in excessive or unbounded quantities.
- Protected store updates may be initiated without sysop authorization.
- Page titles or related metadata may be disclosed.
- Application workers, queues, databases, or other resources may be exhausted.
- Repeated unauthorized updates could affect data integrity or availability.
- Unauthenticated users may execute arbitrary supported queued job types.
- Attackers could trigger jobs in excessive or unbounded quantities.
- Protected store updates may be initiated without sysop authorization.
- Page titles or related metadata may be disclosed.
- Application workers, queues, databases, or other resources may be exhausted.
- Repeated unauthorized updates could affect data integrity or availability.
General mitigation guidance
Mitigation generally focuses on enforcing authorization independently of
CSRF-token possession and limiting the capabilities of public API endpoints.
Common defensive patterns include:
- Applying explicit permission checks to every smwtask operation and target.
- Ensuring job execution is restricted to trusted roles or internal callers.
- Requiring appropriate authorization for updates to protected pages.
- Validating job types, quantities, and execution scope against an allowlist.
- Applying rate limits, quotas, queue limits, and resource isolation to
background work.
- Reducing anonymous API exposure where the functionality is not required.
- Returning only the minimum metadata needed by authorized callers.
- Running workers and database identities with least privilege.
Mitigation generally focuses on enforcing authorization independently of
CSRF-token possession and limiting the capabilities of public API endpoints.
Common defensive patterns include:
- Applying explicit permission checks to every smwtask operation and target.
- Ensuring job execution is restricted to trusted roles or internal callers.
- Requiring appropriate authorization for updates to protected pages.
- Validating job types, quantities, and execution scope against an allowlist.
- Applying rate limits, quotas, queue limits, and resource isolation to
background work.
- Reducing anonymous API exposure where the functionality is not required.
- Returning only the minimum metadata needed by authorized callers.
- Running workers and database identities with least privilege.
How teams detect issues like this
Organizations can identify similar issues through:
- Static analysis and code review checks for API handlers that lack explicit
permission or role checks.
- Searches for authorization decisions based only on CSRF-token validation.
- Review of all paths that enqueue jobs, execute arbitrary job types, or
update protected content.
- Integration tests that exercise sensitive API operations as anonymous users.
- Monitoring for unusual anonymous requests, repeated job submissions, queue
growth, and unauthorized store updates.
- Policy enforcement requiring documented access-control checks for every
state-changing or resource-intensive endpoint.
- Automated security review tools that flag missing authorization and
unrestricted background-job execution patterns.
Organizations can identify similar issues through:
- Static analysis and code review checks for API handlers that lack explicit
permission or role checks.
- Searches for authorization decisions based only on CSRF-token validation.
- Review of all paths that enqueue jobs, execute arbitrary job types, or
update protected content.
- Integration tests that exercise sensitive API operations as anonymous users.
- Monitoring for unusual anonymous requests, repeated job submissions, queue
growth, and unauthorized store updates.
- Policy enforcement requiring documented access-control checks for every
state-changing or resource-intensive endpoint.
- Automated security review tools that flag missing authorization and
unrestricted background-job execution patterns.
