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Vulnerability Details : CVE-2016-7055

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.
Publish Date : 2017-05-04 Last Update Date : 2019-04-23
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- CVSS Scores & Vulnerability Types

CVSS Score
2.6
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity High (Specialized access conditions exist. It is hard to exploit and several special conditions must be satisfied to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 320

- Products Affected By CVE-2016-7055

# Product Type Vendor Product Version Update Edition Language
1 Application Openssl Openssl 1.0.2 Version Details Vulnerabilities
2 Application Openssl Openssl 1.1.0b Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Openssl Openssl 2

- References For CVE-2016-7055

https://www.tenable.com/security/tns-2017-04 CONFIRM
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html CONFIRM
https://www.openssl.org/news/secadv/20161110.txt CONFIRM
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://access.redhat.com/errata/RHSA-2018:2186
REDHAT RHSA-2018:2186
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:02.openssl.asc
FREEBSD FreeBSD-SA-17:02
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html CONFIRM
https://access.redhat.com/errata/RHSA-2018:2187
REDHAT RHSA-2018:2187
http://www.securitytracker.com/id/1037261
SECTRACK 1037261
https://access.redhat.com/errata/RHSA-2018:2185
REDHAT RHSA-2018:2185
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03744en_us CONFIRM
https://security.gentoo.org/glsa/201702-07
GENTOO GLSA-201702-07
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbgn03752en_us CONFIRM
http://www.securityfocus.com/bid/94242
BID 94242 OpenSSL CVE-2016-7055 Denial of Service Vulnerability Release Date:2018-02-05
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html CONFIRM

- Metasploit Modules Related To CVE-2016-7055

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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