CVE-2025-46551 – rubygems:jruby-openssl

Package

Manager: maven
Name: rubygems:jruby-openssl
Vulnerable Version: >=0.12.1 <0.15.4

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

EPSS: 0.00044 pctl0.12551

Details

JRuby-OpenSSL has hostname verification disabled by default ### Summary When verifying SSL certificates, jruby-openssl is not verifying that the hostname presented in the certificate matches the one we are trying to connect to, meaning a MITM could just present _any_ valid cert for a completely different domain they own, and JRuby wouldn't complain. ### Details n/a ### PoC An example domain bad.substitutealert.com was created to present the a certificate for the domain s8a.me. The following script run in IRB in CRuby 3.4.3 will fail with `certificate verify failed (hostname mismatch)`, but will work just fine in JRuby 10.0.0.0 and JRuby 9.4.2.0, both of which use jruby-openssl version 0.15.3 ```ruby require "net/http" require "openssl" uri = URI("https://bad.substitutealert.com/") https = Net::HTTP.new(uri.host, uri.port) https.use_ssl = true https.verify_mode = OpenSSL::SSL::VERIFY_PEER body = https.start { https.get(uri.request_uri).body } puts body ``` ### Impact Anybody using JRuby to make requests of external APIs, or scraping the web, that depends on https to connect securely

Metadata

Created: 2025-05-07T17:32:54Z
Modified: 2025-05-07T19:07:43Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/05/GHSA-72qj-48g4-5xgx/GHSA-72qj-48g4-5xgx.json
CWE IDs: ["CWE-295", "CWE-297"]
Alternative ID: GHSA-72qj-48g4-5xgx
Finding: F163
Auto approve: 1