There is a carry propagating bug in the x86_64 Montgomery squaring procedure. 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. Note: This issue is very similar to CVE-2017-3732 and CVE-2015-3193 but must be treated as a separate problem. External References: https://www.openssl.org/news/secadv/20171102.txt
Created mingw-openssl tracking bugs for this issue: Affects: fedora-all [bug 1486147] Created openssl tracking bugs for this issue: Affects: fedora-all [bug 1486146]
Upstream commit: https://github.com/openssl/openssl/commit/668a709a8d7ea374ee72ad2d43ac72ec60a80eee
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2018:0998 https://access.redhat.com/errata/RHSA-2018:0998
This issue has been addressed in the following products: Red Hat JBoss Core Services Via RHSA-2018:2187 https://access.redhat.com/errata/RHSA-2018:2187
This issue has been addressed in the following products: JBoss Core Services on RHEL 6 Via RHSA-2018:2186 https://access.redhat.com/errata/RHSA-2018:2186
This issue has been addressed in the following products: JBoss Core Services on RHEL 7 Via RHSA-2018:2185 https://access.redhat.com/errata/RHSA-2018:2185
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Supplementary Via RHSA-2018:2568 https://access.redhat.com/errata/RHSA-2018:2568
This issue has been addressed in the following products: Red Hat Enterprise Linux 6 Supplementary Via RHSA-2018:2575 https://access.redhat.com/errata/RHSA-2018:2575
This issue has been addressed in the following products: Red Hat Satellite 5.8 Via RHSA-2018:2713 https://access.redhat.com/errata/RHSA-2018:2713