Improper Validation of Certificate with Host Mismatch Affecting jruby-openssl package, versions >=0.12.1, <0.15.4
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-JRUBYOPENSSL-10074040
- published8 May 2025
- disclosed7 May 2025
- creditMohamed Hafez
Introduced: 7 May 2025
NewCVE-2025-46551 (opens in a new tab)How to fix?
Upgrade jruby-openssl to version 0.15.4 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Certificate with Host Mismatch in the SSL certificate validation process. An attacker can intercept secure communications by presenting a valid certificate for an unrelated domain that the attacker controls.
Note:
This is only exploitable if the attacker is in a "man-in-the-middle" (MITM) position before performing the attack.
PoC
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