SB2019021007 - Fedora 29 update for botan2

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Main Vulnerability Database SB2019021007

SB2019021007 - Fedora 29 update for botan2

Published: February 10, 2019 Updated: April 24, 2025

Security Bulletin ID SB2019021007
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Key management errors (CVE-ID: CVE-2018-20187)

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

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.


Remediation

Install update from vendor's website.

References