CVEvulnerability
CVE-2018-20187
5.9 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2019-03-08
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.0 ([email protected])
- 5.9 MEDIUM — CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS 2.0 ([email protected])
- 4.3 MEDIUM — AV:N/AC:M/Au:N/C:P/I:N/A:N
- Weaknesses
- CWE-320
Description
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.
Affected configurations
• botan project botan (< 2.9.0)
Related
Weakness · not in database (1)
References
- https://botan.randombit.net/news.html Release Notes, Vendor Advisory
- https://botan.randombit.net/security.html Vendor Advisory
- https://github.com/crocs-muni/ECTester Not Applicable, Third Party Advisory
- https://botan.randombit.net/news.html Release Notes, Vendor Advisory
- https://botan.randombit.net/security.html Vendor Advisory
- https://github.com/crocs-muni/ECTester Not Applicable, Third Party Advisory