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URL Redirection to Untrusted Site ('Open Redirect') in mod_auth_openidc

Moderate
zandbelt published GHSA-2pgf-8h6h-gqg2 Sep 3, 2021

Package

mod_auth_openidc (apache httpd)

Affected versions

<=2.4.9.3

Patched versions

>=2.4.9.4

Description

Impact

The 3rd-party init SSO functionality of mod_auth_openidc was reported to be vulnerable to an open redirect attack by supplying a crafted URL in the target_link_uri parameter.

Patches

The OIDCRedirectURLsAllowed setting must be applied to the target_link_uri parameter, see: 03e6bfb

Workarounds

NA

References

https://github.com/zmartzone/mod_auth_openidc/issues/672

For more information

If you have any questions or comments about this advisory, you can contact:

The maintainers, by opening an issue on this repository.

Severity

Moderate

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
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
None
Integrity
Low
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:L/PR:N/UI:R/S:C/C:N/I:L/A:N

CVE ID

CVE-2021-39191

Weaknesses

Credits