Vulnerability Details : CVE-2016-7798
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.
Exploit prediction scoring system (EPSS) score for CVE-2016-7798
Probability of exploitation activity in the next 30 days: 0.38%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 69 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2016-7798
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:N |
10.0
|
2.9
|
NIST |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2016-7798
-
The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.Assigned by: nvd@nist.gov (Primary)
References for CVE-2016-7798
-
http://www.securityfocus.com/bid/93031
Ruby OpenSSL Security Bypass VulnerabilityThird Party Advisory;VDB Entry
-
http://www.openwall.com/lists/oss-security/2016/09/19/9
oss-security - CVE Request - Ruby OpenSSL Library - IV Reuse in GCM ModeMailing List;Third Party Advisory
-
https://github.com/ruby/openssl/issues/49
Possible bug: order of setting key vs. IV affects encryption with AES GCM · Issue #49 · ruby/openssl · GitHubExploit;Third Party Advisory
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https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
[SECURITY] [DLA 1421-1] ruby2.1 security updateMailing List;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2016/09/30/6
oss-security - Re: CVE Request - Ruby OpenSSL Library - IV Reuse in GCM ModeMailing List;Patch;Third Party Advisory
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https://www.debian.org/security/2017/dsa-3966
Debian -- Security Information -- DSA-3966-1 ruby2.3Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2016/10/01/2
oss-security - Re: CVE Request - Ruby OpenSSL Library - IV Reuse in GCM ModeMailing List;Third Party Advisory
-
https://github.com/ruby/openssl/commit/8108e0a6db133f3375608303fdd2083eb5115062
cipher: don't set dummy encryption key in Cipher#initialize · ruby/openssl@8108e0a · GitHubPatch;Third Party Advisory
Products affected by CVE-2016-7798
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:ruby-lang:openssl:*:*:*:*:*:ruby:*:*