Information disclosure in OpenBSD Libressl
CVE-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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- OpenBSD Libressl — versions 2.7.0, 2.7.1, 2.7.2
Weakness classification (CWE)
References
- ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.4-relnotes.txt (Vendor Advisory)
- www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-numb… (Third Party Advisory)
- ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.6.5-relnotes.txt (Vendor Advisory)
Frequently asked questions
- What is CVE-2018-12434?
- CVE-2018-12434 is a medium-severity vulnerability in OpenBSD Libressl, classified under Information Disclosure. CVSS score: 4.7/10. Published 2018-06-15.
- How severe is CVE-2018-12434?
- Medium severity. CVSS v3 base score is 4.7 out of 10.