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Information Disclosure due to Out-of-scope Site Resolution

Low
ohader published GHSA-jq6g-4v5m-wm9r Jul 25, 2023

Package

composer typo3/cms-core (Composer)

Affected versions

9.4.0-9.5.41, 10.0.0-10.4.38, 11.0.0-11.5.29, 12.0.0-12.4.3

Patched versions

9.5.42, 10.4.39, 11.5.30, 12.4.4

Description

CVSS: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C (3.5)

Problem

In multi-site scenarios, enumerating the HTTP query parameters id and L allowed out-of-scope access to rendered content in the website frontend. For instance, this allowed visitors to access content of an internal site by adding handcrafted query parameters to the URL of a site that was publicly available.

Solution

Update to TYPO3 versions 9.5.42 ELTS, 10.4.39 ELTS, 11.5.30, 12.4.4 that fix the problem described above.

ℹ️ Strong security defaults - Manual actions required
Resolving sites by the id and L HTTP query parameters is now denied per default. However, it is still allowed to resolve a particular page by e.g. https://example.org/?id=123&L=0 - as long as the page-id 123 is in the scope of the site configured for the base-url example.org.
The new feature flag security.frontend.allowInsecureSiteResolutionByQueryParameters - which is disabled per default - can be used to reactivate the previous behavior.

Credits

Thanks to Garvin Hicking who reported this issue, and to TYPO3 core & security team members Oliver Hader and Benjamin Franzke who fixed the issue.

References

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVE ID

CVE-2023-38499

Weaknesses

Credits