CVE-2023-50463: Authentication Bypass by Spoofing

December 10, 2023 (updated December 13, 2023)

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

caddyserver.com/v2
github.com/shift72/caddy-geo-ip/issues/4
github.com/shift72/caddy-geo-ip/tags
nvd.nist.gov/vuln/detail/CVE-2023-50463

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