Vulnerability Monitor

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CVE-2015-1855

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.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.9, indicating it can be exploited remotely over the network but requires specific conditions to be met without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts integrity (unauthorized modifications), for affected systems. Impacting 5 products from ruby-lang, from ruby-lang, from debian and 2 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2019-11-29T21:15:10.807

Last Modified

2024-11-21T02:26:16.630

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.9 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	ruby-lang	ruby	< 2.1.6	Yes
Application	ruby-lang	ruby	< 2.2.2	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	ruby	2.0.0	Yes
Application	ruby-lang	trunk	< 50292	Yes
Operating System	debian	debian_linux	7.0	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Application	puppet	puppet_agent	1.0.0	Yes
Application	puppet	puppet_enterprise	< 3.8.0	Yes

References

http://www.debian.org/security/2015/dsa-3245 Third Party Advisory ([email protected])
http://www.debian.org/security/2015/dsa-3246 Third Party Advisory ([email protected])
http://www.debian.org/security/2015/dsa-3247 Third Party Advisory ([email protected])
https://bugs.ruby-lang.org/issues/9644 Third Party Advisory ([email protected])
https://puppetlabs.com/security/cve/cve-2015-1855 Third Party Advisory ([email protected])
https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/ Vendor Advisory ([email protected])
http://www.debian.org/security/2015/dsa-3245 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2015/dsa-3246 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2015/dsa-3247 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://bugs.ruby-lang.org/issues/9644 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://puppetlabs.com/security/cve/cve-2015-1855 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For ruby-lang's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.