Vulnerability Description
There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openssl | Openssl | >= 1.0.2, < 1.0.2k |
| Nodejs | Node.Js | >= 4.0.0, <= 4.1.2 |
References
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlPatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlPatchThird Party Advisory
- http://www.securityfocus.com/bid/94242Third Party AdvisoryUS Government ResourceVDB Entry
- http://www.securitytracker.com/id/1037261Third Party AdvisoryVDB Entry
- 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://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_naThird Party Advisory
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_naThird Party AdvisoryVDB Entry
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:02.openssl.ascThird Party Advisory
- https://security.gentoo.org/glsa/201702-07Third Party Advisory
- https://www.openssl.org/news/secadv/20161110.txtVendor Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatchThird Party Advisory
- https://www.tenable.com/security/tns-2017-04Third Party Advisory
FAQ
What is CVE-2016-7055?
CVE-2016-7055 is a vulnerability with a CVSS score of 5.9 (MEDIUM). There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bit...
How severe is CVE-2016-7055?
CVE-2016-7055 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-7055?
Check the references section above for vendor advisories and patch information. Affected products include: Openssl Openssl, Nodejs Node.Js.