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CVE
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CVE-2017-3736Date: (C)2017-11-04   (M)2018-02-19


There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL before 1.0.2m and 1.1.0 before 1.1.0g. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. This only affects processors that support the BMI1, BMI2 and ADX extensions like Intel Broadwell (5th generation) and later or AMD Ryzen.

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score  : 6.5CVSS Score  : 4.0
Exploit Score: 2.8Exploit Score: 8.0
Impact Score : 3.6Impact Score : 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: LOWAuthentication: SINGLE_INSTANCE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: HIGHAvailability: NONE
Integrity: NONE 
Availability: NONE 
  





Reference:
BID-101666
SECTRACK-1039727
DSA-4017
DSA-4018
FreeBSD-SA-17:11
GLSA-201712-03
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
https://github.com/openssl/openssl/commit/4443cf7aa0099e5ce615c18cee249fff77fb0871
https://security.netapp.com/advisory/ntap-20171107-0002/
https://security.netapp.com/advisory/ntap-20180117-0002/
https://www.openssl.org/news/secadv/20171102.txt
https://www.tenable.com/security/tns-2017-14
https://www.tenable.com/security/tns-2017-15

CWE    1
CWE-200
OVAL    9
oval:org.secpod.oval:def:43224
oval:org.secpod.oval:def:43521
oval:org.secpod.oval:def:113534
oval:org.secpod.oval:def:113486
...

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