CVE-2018-0495

Public Exploit

Description

Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the _gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

Category

4.7
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.28%
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Affected: n/a Libgcrypt before 1.7.10 and 1.8.x before 1.8.3
Published at:
Updated at:

References

Link Tags
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=9010d1576e278a4274ad3f4aa15776c28f6ba965
http://www.securitytracker.com/id/1041144 third party advisory vdb entry
https://usn.ubuntu.com/3850-1/ third party advisory vendor advisory
http://www.securitytracker.com/id/1041147 third party advisory vdb entry
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/ third party advisory exploit
https://usn.ubuntu.com/3689-1/ third party advisory vendor advisory
https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000426.html vendor advisory
https://usn.ubuntu.com/3689-2/ third party advisory vendor advisory
https://usn.ubuntu.com/3692-2/ third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2018/06/msg00013.html third party advisory mailing list
https://www.debian.org/security/2018/dsa-4231 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2018:3505 third party advisory vendor advisory
https://usn.ubuntu.com/3850-2/ third party advisory vendor advisory
https://usn.ubuntu.com/3692-1/ third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2018:3221 third party advisory vendor advisory
https://dev.gnupg.org/T4011 patch vendor advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html third party advisory patch
https://access.redhat.com/errata/RHSA-2019:1297 vendor advisory
https://access.redhat.com/errata/RHSA-2019:1296 vendor advisory
https://access.redhat.com/errata/RHSA-2019:1543 vendor advisory
https://access.redhat.com/errata/RHSA-2019:2237 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2018-0495?
CVE-2018-0495 has been scored as a medium severity vulnerability.
How to fix CVE-2018-0495?
To fix CVE-2018-0495, 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-2018-0495 being actively exploited in the wild?
It is possible that CVE-2018-0495 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-0495?
CVE-2018-0495 affects n/a Libgcrypt before 1.7.10 and 1.8.x before 1.8.3.
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