Description
cryptlib through 3.4.4 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. NOTE: the vendor does not include side-channel attacks within its threat model
References (1)
Core 1
Core References
Exploit, Technical Description, Third Party Advisory x_refsource_misc
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/
Scores
CVSS v3
4.9
EPSS
0.0035
EPSS Percentile
26.6%
Attack Vector
PHYSICAL
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Details
CWE
CWE-200
CWE-320
Status
published
Products (1)
cryptlib/cryptlib
< 3.4.4
Published
Jun 15, 2018
Tracked Since
Feb 18, 2026