vulnerability
FreeBSD: VID-D8E7E854-17FA-11E9-BEF6-6805CA2FA271 (CVE-2018-20187): botan2 -- Side channel during ECC key generation
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:P/I:N/A:N) | Dec 17, 2018 | Jan 28, 2019 | May 3, 2019 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:P/I:N/A:N)
Published
Dec 17, 2018
Added
Jan 28, 2019
Modified
May 3, 2019
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.
Solution
freebsd-upgrade-package-botan2
References
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