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FreeBSD: VID-D8E7E854-17FA-11E9-BEF6-6805CA2FA271 (CVE-2018-20187): botan2 -- Side channel during ECC key generation

Severity CVSS Published Added Modified
4 (AV:L/AC:M/Au:N/C:P/I:P/A:P) December 17, 2018 January 28, 2019 January 28, 2019


Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.

From VID-D8E7E854-17FA-11E9-BEF6-6805CA2FA271:

botan2 developers reports:

A timing side channel during ECC key generation could leak information about the

high bits of the secret scalar. Such information allows an attacker to perform a

brute force attack on the key somewhat more efficiently than they would otherwise.

Found by Ján Jančár using ECTester.

Bug introduced in 1.11.20, fixed in 2.9.0

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