Vulnerability CVE-2018-12434
Published: 2018-06-14   Modified: 2018-06-15

Description:
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.

Type:

CWE-200

 (Information Exposure)

CVSS2 => (AV:L/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
1.9/10
2.9/10
3.4/10
Exploit range
Attack complexity
Authentication
Local
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
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/
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