CVE-2018-0735

Timing attack against ECDSA signature generation

Description

The OpenSSL ECDSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.1.1a (Affected 1.1.1).

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 7.65% Top 10%
Vendor Advisory ubuntu.com Vendor Advisory debian.org Vendor Advisory redhat.com Vendor Advisory openssl.org
Affected: OpenSSL OpenSSL
Published at:
Updated at:

References

Link Tags
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=56fb454d281a023b3f950d969693553d3f3ceea1
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html third party advisory patch
http://www.securityfocus.com/bid/105750 vdb entry third party advisory
https://usn.ubuntu.com/3840-1/ third party advisory vendor advisory
https://security.netapp.com/advisory/ntap-20181105-0002/ third party advisory
https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/ third party advisory
http://www.securitytracker.com/id/1041986 vdb entry third party advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00024.html third party advisory mailing list
https://www.debian.org/security/2018/dsa-4348 third party advisory vendor advisory
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=b1d6d55ece1c26fa2829e2b819b038d7b6d692b4
https://www.openssl.org/news/secadv/20181029.txt vendor advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html third party advisory patch
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html third party advisory patch
https://access.redhat.com/errata/RHSA-2019:3700 third party advisory vendor advisory
https://www.oracle.com/security-alerts/cpujan2020.html third party advisory

Frequently Asked Questions

What is the severity of CVE-2018-0735?
CVE-2018-0735 has been scored as a medium severity vulnerability.
How to fix CVE-2018-0735?
To fix CVE-2018-0735, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-0735 being actively exploited in the wild?
It is possible that CVE-2018-0735 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~8% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-0735?
CVE-2018-0735 affects OpenSSL OpenSSL.
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