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fix variable colision between requests

Critical
zandbelt published GHSA-pvq3-8rvg-f36q Jun 24, 2024

Package

ngx_oauth2_module

Affected versions

<= 3.4.0

Patched versions

>= 3.5.0

Description

Impact

When setting variables in the NGINX config, they would be set in the configuration context and as such be retained over subsequent requests, even the the next request would not contain a token.

What kind of vulnerability is it? Who is impacted?
Configurations that implement some form of access control based on the value of variables set from claims are impacted.

Patches

Users should upgrade to a version >= 3.5.0 which fixes the issue using functionality from liboauth2 >= 1.6.3.

Workarounds

No

References

See #7 and #8

Severity

Critical

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
None
Scope
Changed
Confidentiality
High
Integrity
High
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:N/S:C/C:H/I:H/A:N

CVE ID

No known CVE

Weaknesses

No CWEs

Credits