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CVE-2018-0495

Published: August 31, 2023Last modified: August 7, 2025

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.

Severity score breakdown

ParameterValue
Base score4.7
Attack VectorLOCAL
Attack complexityHIGH
Privileges requiredLOW
User interactionNONE
ScopeUNCHANGED
ConfidentialityHIGH
Integrity impactNONE
Availability impactNONE
VectorCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Status

ProductReleasePackageStatus
Alpaquita Linux23 LTSlibgcryptNot affected (1.10.1-r0)
libresslNot affected (3.6.2-r0)
StreamlibgcryptNot affected (1.10.2-r2)
libresslNot affected (3.7.3-r0)

References

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