CVE-2015-1855

moderate-risk
Published 2019-11-29

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does not properly validate hostnames, which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards, (1) wildcards in IDNA names, (3) case sensitivity, and (4) non-ASCII characters.

Do I need to act?

~
2.7% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.9/10 Medium
NETWORK / HIGH complexity

Affected Products (18)

Trunk
Puppet Agent

Affected Vendors

Debian Ruby-Lang Puppet

References (12)

Third Party Advisory http://www.debian.org/security/2015/dsa-3245
Third Party Advisory http://www.debian.org/security/2015/dsa-3246
Third Party Advisory http://www.debian.org/security/2015/dsa-3247
Third Party Advisory https://bugs.ruby-lang.org/issues/9644
Third Party Advisory https://puppetlabs.com/security/cve/cve-2015-1855
Vendor Advisory https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vuln...
Third Party Advisory http://www.debian.org/security/2015/dsa-3245
Third Party Advisory http://www.debian.org/security/2015/dsa-3246
Third Party Advisory http://www.debian.org/security/2015/dsa-3247
Third Party Advisory https://bugs.ruby-lang.org/issues/9644
Third Party Advisory https://puppetlabs.com/security/cve/cve-2015-1855
Vendor Advisory https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vuln...
43
/ 100
moderate-risk
Severity 18/34 · Moderate
Exploitability 6/34 · Minimal
Exposure 19/34 · Moderate