Caddy is an extensible server platform that uses TLS by default. From version 2.10.0 to before version 2.11.2, forward_auth copy_headers does not strip client-supplied headers, allowing identity injection and privilege escalation. This issue has been patched in version 2.11.2.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/caddyserver/caddy/issues/6610
security-advisories@github.com
https://github.com/caddyserver/caddy/pull/6608
security-advisories@github.com
https://github.com/caddyserver/caddy/pull/7545
security-advisories@github.com
https://github.com/caddyserver/caddy/security/advisories/GHSA-7r4p-vjf4-gxv4
security-advisories@github.com