Arch Linux Security Advisory ASA-201710-17
=========================================
Severity: Medium
Date    : 2017-10-12
CVE-ID  : CVE-2017-14737
Package : botan
Type    : information disclosure
Remote  : No
Link    : https://security.archlinux.org/AVG-416

Summary
======
The package botan before version 2.3.0-1 is vulnerable to information
disclosure.

Resolution
=========
Upgrade to 2.3.0-1.

# pacman -Syu "botan>=2.3.0-1"

The problem has been fixed upstream in version 2.3.0.

Workaround
=========
None.

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.

Impact
=====
A local attacker is able to use a cache-based side channel attack to
recover information about RSA secret keys.

References
=========
https://github.com/randombit/botan/issues/1222
https://github.com/randombit/botan/commit/95df7f155570949837e8e28e733f3d59408092da
https://github.com/randombit/botan/commit/2718c02d429d024b2cd65534f7e54cab1d123348
https://www.usenix.org/conference/usenixsecurity17/technical-sessions/presentation/wang-shuai
https://security.archlinux.org/CVE-2017-14737