Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openssl | Openssl | >= 1.0.2, < 1.0.2m |
Related Weaknesses (CWE)
References
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.htmlPatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.htmlPatchThird Party Advisory
- http://www.securityfocus.com/bid/101666Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039727Third Party AdvisoryVDB 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/4443cf7aa0099e5ce615c18cee249fff77fb08Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:11.openssl.ascThird Party Advisory
FAQ
What is CVE-2017-3736?
CVE-2017-3736 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...
How severe is CVE-2017-3736?
CVE-2017-3736 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-3736?
Check the references section above for vendor advisories and patch information. Affected products include: Openssl Openssl.