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
Status
| Package | Release | Status |
|---|---|---|
|
botan1.10 Launchpad, Ubuntu, Debian |
groovy |
Does not exist
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| bionic |
Not vulnerable
(code not present)
|
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Does not exist
|
|
| eoan |
Does not exist
|
|
| focal |
Does not exist
|
|
| lunar |
Does not exist
|
|
| trusty |
Needs triage
|
|
| upstream |
Not vulnerable
(debian: Vulnerable code introduced in 1.11.20)
|
|
| xenial |
Not vulnerable
(code not present)
|
|
|
botan Launchpad, Ubuntu, Debian |
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)
|
|
| kinetic |
Not vulnerable
(2.9.0-2)
|
|
| bionic |
Needed
|
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Not vulnerable
(2.9.0-2)
|
|
| eoan |
Not vulnerable
(2.9.0-2)
|
|
| focal |
Not vulnerable
(2.9.0-2)
|
|
| lunar |
Not vulnerable
(2.9.0-2)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(2.9.0-2)
|
|
| xenial |
Does not exist
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |