CVE-2018-0495
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…
Does this matter?
Lower severity and a low EPSS score (0.87%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 4.7 MEDIUMCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.87% probability · 59th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-203
- Affected
- gnupg/libgcrypt · canonical/ubuntu linux · debian/debian linux · redhat/ansible tower · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux workstation · oracle/traffic director
- Source
- security@debian.org
EPSS 0.9% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securitytracker.com/id/1041144Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041147Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3221Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3505Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1296
- https://access.redhat.com/errata/RHSA-2019:1297
- https://access.redhat.com/errata/RHSA-2019:1543
- https://access.redhat.com/errata/RHSA-2019:2237
- https://dev.gnupg.org/T4011Patch, Vendor Advisory
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=9010d1576e278a4274ad3f4aa15776c28f6ba965
- https://lists.debian.org/debian-lts-announce/2018/06/msg00013.htmlMailing List, Third Party Advisory
- https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000426.htmlVendor Advisory
- https://usn.ubuntu.com/3689-1/Third Party Advisory
- https://usn.ubuntu.com/3689-2/Third Party Advisory
- https://usn.ubuntu.com/3692-1/Third Party Advisory
- https://usn.ubuntu.com/3692-2/Third Party Advisory
- https://usn.ubuntu.com/3850-1/Third Party Advisory
- https://usn.ubuntu.com/3850-2/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4231Third Party Advisory
- https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/Exploit, Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch, Third Party Advisory
- http://www.securitytracker.com/id/1041144Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041147Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3221Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3505Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1296
- https://access.redhat.com/errata/RHSA-2019:1297
- https://access.redhat.com/errata/RHSA-2019:1543
- https://access.redhat.com/errata/RHSA-2019:2237
- https://dev.gnupg.org/T4011Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.