CVE-2018-20187
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductBotan
PublishedMar 8, 2019
First seenMar 8, 2019
How to fix
Update
- botan_project botan2.9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| botan_project botan | v < 2.9.0 | 2.9.0 |
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