Vulnerability identifier: #VU8121

Vulnerability risk: Low

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-7798

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
RubyGems
Universal components / Libraries / Libraries used by multiple products

Vendor: Ruby

Description
The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to the openssl gem for Ruby uses the same initialization vector (IV) in GCM Mode (aes-*-gcm) when the IV is set before the key. A remote attacker can bypass the encryption protection mechanism and gain access to the system.

Mitigation
Update to version 2.4.0.

Vulnerable software versions

RubyGems: 2.2.0 - 2.3.4

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External links
http://github.com/ruby/openssl/issues/49

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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.