There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL 1.0.2 before 1.0.2k and 1.1.0 before 1.1.0d. 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.
[
{
"product": "OpenSSL",
"vendor": "OpenSSL",
"versions": [
{
"status": "affected",
"version": "openssl-1.1.0"
},
{
"status": "affected",
"version": "openssl-1.1.0a"
},
{
"status": "affected",
"version": "openssl-1.1.0b"
},
{
"status": "affected",
"version": "openssl-1.1.0c"
},
{
"status": "affected",
"version": "openssl-1.0.2"
},
{
"status": "affected",
"version": "openssl-1.0.2a"
},
{
"status": "affected",
"version": "openssl-1.0.2b"
},
{
"status": "affected",
"version": "openssl-1.0.2c"
},
{
"status": "affected",
"version": "openssl-1.0.2d"
},
{
"status": "affected",
"version": "openssl-1.0.2e"
},
{
"status": "affected",
"version": "openssl-1.0.2f"
},
{
"status": "affected",
"version": "openssl-1.0.2g"
},
{
"status": "affected",
"version": "openssl-1.0.2h"
},
{
"status": "affected",
"version": "openssl-1.0.2i"
},
{
"status": "affected",
"version": "openssl-1.0.2j"
}
]
}
]
www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
www.securityfocus.com/bid/95814
www.securitytracker.com/id/1037717
access.redhat.com/errata/RHSA-2018:2185
access.redhat.com/errata/RHSA-2018:2186
access.redhat.com/errata/RHSA-2018:2187
access.redhat.com/errata/RHSA-2018:2568
access.redhat.com/errata/RHSA-2018:2575
access.redhat.com/errata/RHSA-2018:2713
github.com/openssl/openssl/commit/a59b90bf491410f1f2bc4540cc21f1980fd14c5b
security.FreeBSD.org/advisories/FreeBSD-SA-17:02.openssl.asc
security.gentoo.org/glsa/201702-07
support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03838en_us
www.openssl.org/news/secadv/20170126.txt
www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
www.tenable.com/security/tns-2017-04