Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gnupg | Libgcrypt | < 1.7.10 |
| Canonical | Ubuntu Linux | 12.04 |
| Debian | Debian Linux | 8.0 |
| Redhat | Ansible Tower | 3.3 |
| Redhat | Enterprise Linux Desktop | 7.0 |
| Redhat | Enterprise Linux Server | 7.0 |
| Redhat | Enterprise Linux Workstation | 7.0 |
| Oracle | Traffic Director | 11.1.1.9.0 |
Related Weaknesses (CWE)
References
- http://www.securitytracker.com/id/1041144Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1041147Third Party AdvisoryVDB 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/T4011PatchVendor Advisory
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=9010d157
- https://lists.debian.org/debian-lts-announce/2018/06/msg00013.htmlMailing ListThird 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
FAQ
What is CVE-2018-0495?
CVE-2018-0495 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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_e...
How severe is CVE-2018-0495?
CVE-2018-0495 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-0495?
Check the references section above for vendor advisories and patch information. Affected products include: Gnupg Libgcrypt, Canonical Ubuntu Linux, Debian Debian Linux, Redhat Ansible Tower, Redhat Enterprise Linux Desktop.