CVE-2018-12434 json
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 H…
published 2018-06-15 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-4405
- cvss
- 4.7
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 24%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- openbsd libressl 2.6.5
- libressl openSUSE Tumbleweed 3.3.4-1.2
opensuse advisories openSUSE-SU-2024:10985-1
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 4.7 | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 1.9 | AV:L/AC:M/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
ftp.openbsd.org
/pub/OpenBSD/LibreSSL/libressl-2.7.4-relnotes.txt
vendor-advisory
-
ftp.openbsd.org
/pub/OpenBSD/LibreSSL/libressl-2.6.5-relnotes.txt
vendor-advisory
-
nccgroup.trust
/us/our-research/technical-advisory-return-of-the-hidden-number-problem/
third-party-advisory
Sources
- CVE List CVE-2018-12434
- NVD CVE-2018-12434
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