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CVE-2017-3736

Published: 2 November 2017

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.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
openssl
Launchpad, Ubuntu, Debian
artful
Released (1.0.2g-1ubuntu13.2)
bionic
Released (1.0.2g-1ubuntu14)
cosmic
Released (1.0.2g-1ubuntu14)
disco
Released (1.0.2g-1ubuntu14)
trusty Not vulnerable
(1.0.1f-1ubuntu2.22)
upstream
Released (1.0.2m)
xenial
Released (1.0.2g-1ubuntu4.9)
zesty
Released (1.0.2g-1ubuntu11.3)
Patches:
upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=38d600147331d36e74174ebbd4008b63188b321b
openssl098
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

disco Does not exist

trusty Does not exist
(trusty was needs-triage)
upstream Needs triage

xenial Does not exist

zesty Does not exist

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N