CVE-2018-19148

Public Exploit

Description

Caddy through 0.11.0 sends incorrect certificates for certain invalid requests, making it easier for attackers to enumerate hostnames. Specifically, when unable to match a Host header with a vhost in its configuration, it serves the X.509 certificate for a randomly selected vhost in its configuration. Repeated requests (with a nonexistent hostname in the Host header) permit full enumeration of all certificates on the server. This generally permits an attacker to easily and accurately discover the existence of and relationships among hostnames that weren't meant to be public, though this information could likely have been discovered via other methods with additional effort.

Category

3.7
CVSS
Severity: Low
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.17%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory securitytrails.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/mholt/caddy/pull/2015 patch third party advisory issue tracking
https://github.com/mholt/caddy/issues/1303 patch third party advisory issue tracking
https://github.com/mholt/caddy/issues/2334 patch third party advisory issue tracking
https://securitytrails.com/blog/caddy-web-server-ssl-bug exploit patch third party advisory

Frequently Asked Questions

What is the severity of CVE-2018-19148?
CVE-2018-19148 has been scored as a low severity vulnerability.
How to fix CVE-2018-19148?
To fix CVE-2018-19148, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-19148 being actively exploited in the wild?
It is possible that CVE-2018-19148 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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