National Vulnerability Database

National Vulnerability Database

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    Vulnerabilities Detail

CVE-2016-7055 Detail

Current Description

There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 5.9 MEDIUM
Vector: AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H (V3 legend)
Impact Score: 3.6
Exploitability Score: 2.2

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 2.6 LOW
Vector: (AV:N/AC:H/Au:N/C:N/I:N/A:P) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 4.9

Access Vector (AV): Network
Access Complexity (AC): High
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Partial
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html Patch Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html Patch Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html Patch Third Party Advisory
http://www.securityfocus.com/bid/94242 Third Party Advisory US Government Resource VDB Entry
http://www.securitytracker.com/id/1037261 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2018:2185 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2186 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2187 Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbgn03752en_us Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03744en_us Third Party Advisory VDB Entry
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:02.openssl.asc Third Party Advisory
https://security.gentoo.org/glsa/201702-07 Third Party Advisory
https://www.openssl.org/news/secadv/20161110.txt Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html Patch Third Party Advisory
https://www.tenable.com/security/tns-2017-04 Third Party Advisory

Technical Details

Vulnerability Type (View All)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
1.0.2		Up to (excluding)
1.0.2k
 cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
1.1.0		Up to (excluding)
1.1.0c


Change History

14 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2016-7055
NVD Published Date:
05/04/2017
NVD Last Modified:
07/02/2019