Red Hat Bugzilla – Bug 1416856
CVE-2017-3732 openssl: BN_mod_exp may produce incorrect results on x86_64
Last modified: 2018-10-19 17:39:50 EDT
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. For example this can occur by default in OpenSSL DHE based SSL/TLS ciphersuites. Note: This issue is very similar to CVE-2015-3193 but must be treated as a separate problem. OpenSSL 1.0.2 users should upgrade to 1.0.2k External References: https://www.openssl.org/news/secadv/20170126.txt
Created openssl101e tracking bugs for this issue: Affects: epel-5 [bug 1416866]
Created openssl tracking bugs for this issue: Affects: fedora-all [bug 1416864]
Created mingw-openssl tracking bugs for this issue: Affects: fedora-all [bug 1416865] Affects: epel-7 [bug 1416867]
Upstream commit: https://git.openssl.org/?p=openssl.git;a=commitdiff;h=3f4bcf5bb664b47ed369a70b99fac4e0ad141bb3
Affected code does not exist in OpenSSL 1.0.1 and earlier. It's the same code that was affected by the CVE-2015-3193 (bug 1288317).
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