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Open Redirect in oidc_validate_redirect_url() using tab character

Moderate
zandbelt published GHSA-q6f2-285m-gr53 Dec 14, 2022

Package

mod_auth_openidc

Affected versions

<=2.4.12.1

Patched versions

>=2.4.12.2

Description

Impact

When providing a logout parameter to the redirect URI, the existing code in oidc_validate_redirect_url() does not properly check for URLs that start with /\t, leading to an open redirect.

Patches

This bug has been fixed by adding an additional check for /\t in oidc_validate_redirect_url()

Workarounds

This vulnerability can mitigated by configuring mod_auth_openidc to only allow redirection whose destination matches a given regular expression with OIDCRedirectURLsAllowed.

Severity

Moderate
4.7
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

CVE ID

CVE-2022-23527

Weaknesses