Upstream information

CVE-2018-20187 at MITRE

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.

SUSE information

Overall state of this security issue: Does not affect SUSE products

This issue is currently rated as having low severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 4.3
Vector AV:N/AC:M/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 5.9 2.5
Vector AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Access Vector Network Local
Access Complexity High High
Privileges Required None Low
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact High Low
Integrity Impact None None
Availability Impact None None
CVSSv3 Version 3.0 3.0
SUSE Bugzilla entry: 1121389 [NEW]

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
SUSE Linux Enterprise SDK 11 SP4 Botan Not affected
SUSE Linux Enterprise SDK 12 SP3 Botan Not affected
SUSE Linux Enterprise SDK 12 SP4 Botan Not affected