[Forgot Password]
Login  Register Subscribe

24128

 
 

131573

 
 

111017

 
 

909

 
 

86402

 
 

136

Paid content will be excluded from the download.


Download | Alert*
CVE
view XML view JSON

CVE-2016-7055Date: (C)2017-05-05   (M)2018-07-16


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 5.9CVSS Score : 2.6
Exploit Score: 2.2Exploit Score: 4.9
Impact Score: 3.6Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: HIGHAccess Complexity: HIGH
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: NONE
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: NONEAvailability: PARTIAL
Integrity: NONE 
Availability: HIGH 
  
Reference:
SECTRACK-1037261
BID-94242
FreeBSD-SA-17:02
GLSA-201702-07
RHSA-2018:2185
RHSA-2018:2186
RHSA-2018:2187
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbgn03752en_us
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03744en_us
https://www.openssl.org/news/secadv/20161110.txt
https://www.tenable.com/security/tns-2017-04

CPE    1
cpe:/a:openssl:openssl:1.0.2
CWE    1
CWE-320
OVAL    4
oval:org.secpod.oval:def:38025
oval:org.secpod.oval:def:703441
oval:org.secpod.oval:def:1800417
oval:org.secpod.oval:def:1800846
...

© SecPod Technologies