Vulnerability in Gnupg Libgcrypt
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (58.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: -0.000
Affected products
- Gnupg Libgcrypt
- Oracle Traffic Director — versions 11.1.1.9.0
- Canonical Ubuntu Linux — versions 12.04, 14.04, 16.04
- Debian Linux — versions 8.0, 9.0
- Red Hat Ansible Tower — versions 3.3
- Red Hat Enterprise Linux Desktop — versions 7.0
- Red Hat Enterprise Linux Server — versions 7.0
- Red Hat Enterprise Linux Workstation — versions 7.0
- Libgcrypt Before 1.7.10 And 1.8.x 1.8.3 — versions Libgcrypt before 1.7.10 and 1.8.x before 1.8.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- git.gnupg.org/cgi-bin/gitweb.cgi
- www.securitytracker.com/id/1041144 (VDB Entry, Third Party Advisory, vdb-entry)
- usn.ubuntu.com/3850-1/ (vendor-advisory, Third Party Advisory)
- www.securitytracker.com/id/1041147 (VDB Entry, Third Party Advisory, vdb-entry)
- www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-numb… (Exploit, Third Party Advisory)
- usn.ubuntu.com/3689-1/ (vendor-advisory, Third Party Advisory)
- lists.gnupg.org/pipermail/gnupg-announce/2018q2/000426.html (Vendor Advisory)
- usn.ubuntu.com/3689-2/ (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3692-2/ (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2018/06/msg00013.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-0495?
- CVE-2018-0495 is a medium-severity vulnerability in Gnupg Libgcrypt, classified under Observable Discrepancy. CVSS score: 4.7/10. Published 2018-06-13.
- How severe is CVE-2018-0495?
- Medium severity. CVSS v3 base score is 4.7 out of 10.
- Is CVE-2018-0495 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.