CVSS 3.0
4.7 mediumCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:NCVE-2018-12434
LibreSSL before 2.6.5 and 2.7.x before 2.7.4 allows a memory-cache side-channel attack on DSA and ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover a key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-31)
- CWE
- CWE-200
- Published
- Modified
- Record from
- the NVD, synced
Affected
- openbsd:libressl
References
- https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.6.5-relnotes.txt
- https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.4-relnotes.txt
- https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/
- https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.6.5-relnotes.txt
- https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.4-relnotes.txt