Input validation error in Ruby

1) Input validation error

EUVDB-ID: #VU35016

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-1855

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Ruby: 2.2.0 - 2.2.1

External links

http://www.debian.org/security/2015/dsa-3245
http://www.debian.org/security/2015/dsa-3246
http://www.debian.org/security/2015/dsa-3247
http://bugs.ruby-lang.org/issues/9644
http://puppetlabs.com/security/cve/cve-2015-1855
http://www.ruby-lang.org/en/news/2015/04/13/ruby-openssl-hostname-matching-vulnerability/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.