CVE-2018-12435

low-risk
Published 2018-06-15

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.

Do I need to act?

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0.15% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.9/10 Medium
LOCAL / HIGH complexity

Affected Products (1)

Affected Vendors

Botan Project

References (6)

Third Party Advisory https://botan.randombit.net/security.html
Patch https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848...
Exploit https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidd...
Third Party Advisory https://botan.randombit.net/security.html
Patch https://github.com/randombit/botan/commit/48fc8df51d99f9d8ba251219367b3d629cc848...
Exploit https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidd...
21
/ 100
low-risk
Severity 15/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal