Vulnerability CVE-2018-12435
Published: 2018-06-14   Modified: 2018-06-15

Description:
Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp. To discover an ECDSA 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
Botan project -> Botan 

 References:
https://botan.randombit.net/security.html
https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848e3
https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/
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