CVE-2018-0495
ROHNP: Key Extraction Side Channel in Multiple Crypto Libraries
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · June 13, 2018
Updated · October 14, 2026
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.
Statement
Since the 5.8.3 release, Red Hat CloudForms no longer uses libtomcrypt.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 5.1CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor