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Header spoofing in caddy-geo-ip

Moderate severity GitHub Reviewed Published Dec 11, 2023 to the GitHub Advisory Database • Updated Dec 13, 2023

Package

gomod github.com/shift72/caddy-geo-ip (Go)

Affected versions

<= 0.6.0

Patched versions

None

Description

The caddy-geo-ip (aka GeoIP) middleware through 0.6.0 for Caddy 2, when trust_header X-Forwarded-For is used, allows attackers to spoof their source IP address via an X-Forwarded-For header, which may bypass a protection mechanism (trusted_proxy directive in reverse_proxy or IP address range restrictions).

References

Published by the National Vulnerability Database Dec 10, 2023
Published to the GitHub Advisory Database Dec 11, 2023
Reviewed Dec 11, 2023
Last updated Dec 13, 2023

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
Unchanged
Confidentiality
None
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:R/S:U/C:N/I:H/A:N

EPSS score

0.057%
(25th percentile)

Weaknesses

CVE ID

CVE-2023-50463

GHSA ID

GHSA-rxg9-hgq7-8pwx

Source code

github.com/shift72/caddy-geo-ip
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