CVE-2017-3736
The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 10.1%, higher than 95% of all known CVEs. Patch or mitigate before the next change window.
Description
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 3.0
- 6.5 MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 10.13% probability · 95th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- openssl/openssl
- Source
- openssl-security@openssl.org
References
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.htmlPatch, Third Party Advisory
- http://www.securityfocus.com/bid/101666Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039727Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:0998Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2185Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2186Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2187Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2568Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2575Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2713Third Party Advisory
- https://github.com/openssl/openssl/commit/4443cf7aa0099e5ce615c18cee249fff77fb0871Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:11.openssl.ascThird Party Advisory
- https://security.gentoo.org/glsa/201712-03Third Party Advisory
- https://security.netapp.com/advisory/ntap-20171107-0002/Issue Tracking, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20180117-0002/Third Party Advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03881en_usThird Party Advisory
- https://www.debian.org/security/2017/dsa-4017Issue Tracking, Third Party Advisory
- https://www.debian.org/security/2017/dsa-4018Issue Tracking, Third Party Advisory
- https://www.openssl.org/news/secadv/20171102.txtIssue Tracking, Vendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- https://www.tenable.com/security/tns-2017-14Issue Tracking, Third Party Advisory
- https://www.tenable.com/security/tns-2017-15Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatch, Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.