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IgnoreIP/IgnoreCIDR should not trust X-Forwarded-For

Critical
wargio published GHSA-7qjc-q4j9-pc8x Oct 11, 2023

Package

naxsi (NGINX)

Affected versions

>= 1.3

Patched versions

1.6

Description

Impact

Allows to bypass the WAF when a malicious X-Forwarded-For IP matches IgnoreIP IgnoreCIDR rules.

This old code was arranged to allow older NGINX versions to also support IgnoreIP IgnoreCIDR when multiple reverse proxies were present.

Patches

Patched in 1b71252

Workarounds

Do not set any IgnoreIP IgnoreCIDR for older versions.

References

#103

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
Unchanged
Confidentiality
High
Integrity
None
Availability
High

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:U/C:H/I:N/A:H

CVE ID

CVE-2023-45132

Weaknesses

No CWEs

Credits