CVE-2016-2178

openssl: Non-constant time codepath followed for certain operations in DSA implementation

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The dsa_sign_setup function in crypto/dsa/dsa_ossl.c in OpenSSL through 1.0.2h does not properly ensure the use of constant-time operations, which makes it easier for local users to discover a DSA private key via a timing side-channel attack.

La función dsa_sign_setup en crypto/dsa/dsa_ossl.c en OpenSSL hasta la versión 1.0.2h no asegura correctamente la utilización de operaciones de tiempo constante, lo que facilita a usuarios locales descubrir una clave privada DSA a través de un ataque de sincronización de canal lateral.

It was discovered that OpenSSL did not always use constant time operations when computing Digital Signature Algorithm (DSA) signatures. A local attacker could possibly use this flaw to obtain a private DSA key belonging to another user or service running on the same system.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-01-29 CVE Reserved
2016-06-20 CVE Published
2024-05-03 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-203: Observable Discrepancy
CWE-385: Covert Timing Channel

CAPEC

References (70)

URL	Tag	Source
http://eprint.iacr.org/2016/594.pdf	Technical Description
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759	Third Party Advisory
http://seclists.org/fulldisclosure/2017/Jul/31	Mailing List
http://www-01.ibm.com/support/docview.wss?uid=swg21995039	Third Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170322-01-openssl-en	Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/06/08/10	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/08/11	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/08/12	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/08/4	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/08/5	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/08/6	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/08/7	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/08/8	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/09/2	Mailing List
http://www.openwall.com/lists/oss-security/2016/06/09/8	Mailing List
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html	Third Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html	Third Party Advisory
http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html	Third Party Advisory
http://www.securityfocus.com/bid/91081	Third Party Advisory
http://www.securitytracker.com/id/1036054	Third Party Advisory
http://www.splunk.com/view/SP-CAAAPSV	Third Party Advisory
http://www.splunk.com/view/SP-CAAAPUE	Third Party Advisory
https://bto.bluecoat.com/security-advisory/sa132	Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=399944622df7bd81af62e67ea967c470534090e2
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-c05302448	Third Party Advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05302448	Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312	Third Party Advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10215	Third Party Advisory
https://nodejs.org/en/blog/vulnerability/september-2016-security-releases	Third Party Advisory
https://support.f5.com/csp/article/K53084033	Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en&docId=emr_na-hpesbhf03856en_us	Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03856en_us	Third Party Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24	Third Party Advisory
https://www.tenable.com/security/tns-2016-16	Third Party Advisory
https://www.tenable.com/security/tns-2016-20	Third Party Advisory
https://www.tenable.com/security/tns-2016-21	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2016/06/08/2	2023-11-07
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html	2023-11-07
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html	2023-11-07
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html	2023-11-07
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html	2023-11-07
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html	2023-11-07
https://bugzilla.redhat.com/show_bug.cgi?id=1343400	2017-06-28

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00022.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00023.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00024.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00031.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00005.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00011.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00012.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00013.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00021.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00029.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00010.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00011.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00032.html	2023-11-07
http://rhn.redhat.com/errata/RHSA-2016-1940.html	2023-11-07
http://rhn.redhat.com/errata/RHSA-2016-2957.html	2023-11-07
http://rhn.redhat.com/errata/RHSA-2017-1659.html	2023-11-07
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160927-openssl	2023-11-07
http://www.debian.org/security/2016/dsa-3673	2023-11-07
http://www.ubuntu.com/usn/USN-3087-1	2023-11-07
http://www.ubuntu.com/usn/USN-3087-2	2023-11-07
https://access.redhat.com/errata/RHSA-2017:0193	2023-11-07
https://access.redhat.com/errata/RHSA-2017:0194	2023-11-07
https://access.redhat.com/errata/RHSA-2017:1658	2023-11-07
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc	2023-11-07
https://security.gentoo.org/glsa/201612-16	2023-11-07
https://access.redhat.com/security/cve/CVE-2016-2178	2017-06-28

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1 Search vendor "Openssl" for product "Openssl" and version "1.0.1"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1a Search vendor "Openssl" for product "Openssl" and version "1.0.1a"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1b Search vendor "Openssl" for product "Openssl" and version "1.0.1b"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1c Search vendor "Openssl" for product "Openssl" and version "1.0.1c"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1d Search vendor "Openssl" for product "Openssl" and version "1.0.1d"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1e Search vendor "Openssl" for product "Openssl" and version "1.0.1e"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1f Search vendor "Openssl" for product "Openssl" and version "1.0.1f"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1g Search vendor "Openssl" for product "Openssl" and version "1.0.1g"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1h Search vendor "Openssl" for product "Openssl" and version "1.0.1h"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1i Search vendor "Openssl" for product "Openssl" and version "1.0.1i"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1j Search vendor "Openssl" for product "Openssl" and version "1.0.1j"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1k Search vendor "Openssl" for product "Openssl" and version "1.0.1k"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1l Search vendor "Openssl" for product "Openssl" and version "1.0.1l"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1m Search vendor "Openssl" for product "Openssl" and version "1.0.1m"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1n Search vendor "Openssl" for product "Openssl" and version "1.0.1n"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1o Search vendor "Openssl" for product "Openssl" and version "1.0.1o"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1p Search vendor "Openssl" for product "Openssl" and version "1.0.1p"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1q Search vendor "Openssl" for product "Openssl" and version "1.0.1q"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1r Search vendor "Openssl" for product "Openssl" and version "1.0.1r"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1s Search vendor "Openssl" for product "Openssl" and version "1.0.1s"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.1t Search vendor "Openssl" for product "Openssl" and version "1.0.1t"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2 Search vendor "Openssl" for product "Openssl" and version "1.0.2"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2a Search vendor "Openssl" for product "Openssl" and version "1.0.2a"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2b Search vendor "Openssl" for product "Openssl" and version "1.0.2b"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2c Search vendor "Openssl" for product "Openssl" and version "1.0.2c"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2d Search vendor "Openssl" for product "Openssl" and version "1.0.2d"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2e Search vendor "Openssl" for product "Openssl" and version "1.0.2e"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2f Search vendor "Openssl" for product "Openssl" and version "1.0.2f"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2g Search vendor "Openssl" for product "Openssl" and version "1.0.2g"		-		Affected
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				1.0.2h Search vendor "Openssl" for product "Openssl" and version "1.0.2h"		-		Affected
Oracle Search vendor "Oracle"		Linux Search vendor "Oracle" for product "Linux"				5 Search vendor "Oracle" for product "Linux" and version "5"		-		Affected
Oracle Search vendor "Oracle"		Linux Search vendor "Oracle" for product "Linux"				6 Search vendor "Oracle" for product "Linux" and version "6"		-		Affected
Oracle Search vendor "Oracle"		Linux Search vendor "Oracle" for product "Linux"				7 Search vendor "Oracle" for product "Linux" and version "7"		-		Affected
Oracle Search vendor "Oracle"		Solaris Search vendor "Oracle" for product "Solaris"				10 Search vendor "Oracle" for product "Solaris" and version "10"		-		Affected
Oracle Search vendor "Oracle"		Solaris Search vendor "Oracle" for product "Solaris"				11.3 Search vendor "Oracle" for product "Solaris" and version "11.3"		-		Affected
Suse Search vendor "Suse"		Linux Enterprise Search vendor "Suse" for product "Linux Enterprise"				12.0 Search vendor "Suse" for product "Linux Enterprise" and version "12.0"		-		Affected
Nodejs Search vendor "Nodejs"		Node.js Search vendor "Nodejs" for product "Node.js"				>= 0.10.0 < 0.10.47 Search vendor "Nodejs" for product "Node.js" and version " >= 0.10.0 < 0.10.47"		-		Affected
Nodejs Search vendor "Nodejs"		Node.js Search vendor "Nodejs" for product "Node.js"				>= 0.12.0 < 0.12.16 Search vendor "Nodejs" for product "Node.js" and version " >= 0.12.0 < 0.12.16"		-		Affected
Nodejs Search vendor "Nodejs"		Node.js Search vendor "Nodejs" for product "Node.js"				>= 4.0.0 <= 4.1.2 Search vendor "Nodejs" for product "Node.js" and version " >= 4.0.0 <= 4.1.2"		-		Affected
Nodejs Search vendor "Nodejs"		Node.js Search vendor "Nodejs" for product "Node.js"				>= 4.2.0 < 4.6.0 Search vendor "Nodejs" for product "Node.js" and version " >= 4.2.0 < 4.6.0"		lts		Affected
Nodejs Search vendor "Nodejs"		Node.js Search vendor "Nodejs" for product "Node.js"				>= 5.0.0 < 6.7.0 Search vendor "Nodejs" for product "Node.js" and version " >= 5.0.0 < 6.7.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		esm		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		esm		Affected