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CVE-2018-20187

Status Candidate

Overview

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.

Related Files

Botan C++ Crypto Algorithms Library 2.9.0
Posted Jan 7, 2019
Site botan.randombit.net

Botan is a C++ library of cryptographic algorithms, including AES, DES, SHA-1, RSA, DSA, Diffie-Hellman, and many others. It also supports X.509 certificates and CRLs, and PKCS #10 certificate requests, and has a high level filter/pipe message processing system. The library is easily portable to most systems and compilers, and includes a substantial tutorial and API reference. This is the current stable release.

Changes: Fixed bugs in TLS which caused negotiation failures when the client used an unknown signature algorithm or version. Addressed a side channel during ECC key generation, which used an unblinded Montgomery ladder. Various other updates.
tags | library
advisories | CVE-2018-20187
MD5 | db8403d6a2f10c20fde3f3c76be9a045
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