Vulnerability in Botan Project
CVE-2018-20187
A side-channel issue was discovered in Botan before 2.9.0. An attacker capable of precisely measuring the time taken for ECC key generation may be able to derive information about the high bits of the secret key, as the function to derive the public point from the secret scalar uses an unblinded Montgomery ladder whose loop iteration count depends on the bitlength of the secret. This issue affects only key generation, not ECDSA signatures or ECDH key agreement.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.015 (73.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/crocs-muni/ECTester (Third Party Advisory, Not Applicable)
- botan.randombit.net/news.html (Release Notes, Vendor Advisory)
- botan.randombit.net/security.html (Vendor Advisory)
Frequently asked questions
- What is CVE-2018-20187?
- CVE-2018-20187 is a medium-severity vulnerability in Botan Project, classified under CWE-320. CVSS score: 5.9/10. Published 2019-03-08.
- How severe is CVE-2018-20187?
- Medium severity. CVSS v3 base score is 5.9 out of 10.