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CVE-2018-20187

Published: 8 March 2019

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.

Priority

Medium

CVSS 3 base score: 5.9

Status

Package Release Status
botan
Launchpad, Ubuntu, Debian
bionic Needed

cosmic Ignored
(reached end-of-life)
disco Not vulnerable
(2.9.0-2)
eoan Not vulnerable
(2.9.0-2)
focal Not vulnerable
(2.9.0-2)
groovy Not vulnerable
(2.9.0-2)
hirsute Not vulnerable
(2.9.0-2)
impish Not vulnerable
(2.9.0-2)
jammy Not vulnerable
(2.9.0-2)
precise Does not exist

trusty Does not exist

upstream
Released (2.9.0-2)
xenial Does not exist

botan1.10
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
cosmic Ignored
(reached end-of-life)
disco Does not exist

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

precise Does not exist

trusty Does not exist
(trusty was needs-triage)
upstream Not vulnerable
(debian: Vulnerable code introduced in 1.11.20)
xenial Not vulnerable
(code not present)