Description
A cryptographic cache-based side channel in the RSA implementation in Botan before 1.10.17, and 1.11.x and 2.x before 2.3.0, allows a local attacker to recover information about RSA secret keys, as demonstrated by CacheD. This occurs because an array is indexed with bits derived from a secret key.
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 9 | botan1.10 | 1.10.17-1+deb9u1 | DLA-2812-1 |
| Debian 7 | botan1.10 | 1.10.5-1+deb7u4 | DLA-1125-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | botan1.10 | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | botan1.10 | 1.10.5-1+deb7u1ubuntu0.14.04.1+esm1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | Botan | 1.10.9-4.3.1 | SUSE-SU-2017:2855-1 |
| SLES 12 SP2 | Botan | 1.10.9-4.3.1 | SUSE-SU-2017:2855-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | Botan | 2.18.1-1.3 | openSUSE-SU-2024:10594-1 |
Advisories 4
- DLA-2812-1 botan1.10 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1125-1 botan1.10 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10594-1 Botan-2.18.1-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2855-1 Security update for Botan SUSE / openSUSE Security Updates · Feb 4, 2026