VDB
CVE-2018-20187
CVE-2018-20187
PUBLISHED
CVSS 5.900000095367432 MEDIUM
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.
EPSS 1.53% · 73.8th percentile
Risk Scores
CVSS 3.0
5.900000095367432
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS Score
1.53%
73.8th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:18.04:LTS | botan | 0, 2.4.0-3, 2.4.0-4 |
| Ubuntu:Pro:14.04:LTS | botan1.10 | 1.10.5-1ubuntu1, 0, 1.10.5-1+deb7u1ubuntu0.14.04.1 |
Timeline
- Mar 8, 2019 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 25, 2021 EPSS Score
- Oct 27, 2021 EPSS Score
- Mar 2, 2022 EPSS Score
- May 4, 2022 EPSS Score
- Jul 6, 2022 EPSS Score
- Sep 9, 2022 EPSS Score
- Nov 11, 2022 EPSS Score
- Jan 13, 2023 EPSS Score
- Mar 7, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2018-20187 third-party-advisory
- https://github.com/randombit/botan/pull/1792 third-party-advisory
- https://github.com/randombit/botan/commit/70aa7303acfff9eefc24598c289a84db3579ebd1 third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2018-20187 third-party-advisory