Vulnerability CVE-2016-7798
Published: 2017-01-30   Modified: 2017-01-31

Description:
The openssl gem for Ruby uses the same initialization vector (IV) in GCM Mode (aes-*-gcm) when the IV is set before the key, which makes it easier for context-dependent attackers to bypass the encryption protection mechanism.

Type:

CWE-310

 (Cryptographic Issues)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Ruby-lang -> Openssl 

 References:
http://www.openwall.com/lists/oss-security/2016/09/19/9
http://www.openwall.com/lists/oss-security/2016/09/30/6
http://www.openwall.com/lists/oss-security/2016/10/01/2
http://www.securityfocus.com/bid/93031
https://github.com/ruby/openssl/commit/8108e0a6db133f3375608303fdd2083eb5115062
https://github.com/ruby/openssl/issues/49
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
https://www.debian.org/security/2017/dsa-3966
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