CVE-2018-0495
libgcrypt20 - security update
4.7
MEDIUM
CVSS 3.1
EPSS 0.30%
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.
How to fix CVE-2018-0495
To remediate CVE-2018-0495, upgrade the affected package to a fixed version below.
- —upgrade to 1.8.3-r0 or later
- —upgrade to 2.7.4-r0 or later
- —upgrade to 1.8.3-1 or later
- —upgrade to 1.6.3-2+deb8u5 or later
- —upgrade to 1.7.6-2+deb9u3 or later
Is CVE-2018-0495 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0, < 1.8.3-r0
- from 0, < 2.7.4-r0
- from 0, < 1.8.3-1
- from 0, < 1.6.3-2+deb8u5
- from 0, < 1.7.6-2+deb9u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.7 | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |