Description
Botan before 1.10.13 and 1.11.x before 1.11.29 do not use a constant-time algorithm to perform a modular inverse on the signature nonce k, which might allow remote attackers to obtain ECDSA secret keys via a timing side-channel attack.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | botan1.10 | 1.10.8-2+deb8u1 | DSA-3565-1 |
| Debian 7 | botan1.10 | 1.10.5-1+deb7u1 | DLA-449-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | botan1.10 | No fix yet | — |
| Ubuntu 14.04 LTS | botan1.10 | 1.10.5-1+deb7u1ubuntu0.14.04.1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | Botan | 1.10.9-3.1 | SUSE-SU-2017:1222-1 |
| SLES 12 SP1 | Botan | 1.10.9-3.1 | SUSE-SU-2017:1222-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | Botan | 1.10.13-1.1 | openSUSE-SU-2024:10477-1 |
Advisories 4
- DLA-449-1 botan1.10 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3565-1 botan1.10 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:1222-1 Security update for Botan SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10477-1 libbotan-1_10-1-1.10.13-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- FEDORA-2016-a545f81683 vendor-advisory
- DSA-3565 vendor-advisory
- [botan-devel] 20160428 Botan 1.10.13 released mailing-list
- GLSA-201701-23 vendor-advisory
- http://botan.randombit.net/security.html