CVE-2016-7055

 

Published at: - 04-05-2017 10:29

Last modified: - 01-09-2022 06:25

Total changes: - 2

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

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

 

Keywords

NVD

 

CVE-2016-7055

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures