Timing based private key exposure in Bouncy Castle

中 5.9CVE-2020-15522 · GHSA-6xx3-rg99-gc3p · 20/05/2021 公開 · 17/06/2026 更新

要点

CVE-2020-15522 は org.bouncycastle:bc-fips, org.bouncycastle:bcprov-ext-jdk15on, org.bouncycastle:bcprov-ext-jdk16 に影響する深刻度「中」 (CVSS 5.9) の脆弱性です。
今後30日間に悪用される確率（EPSS）：1.5%（全脆弱性の 74.6% より高い）。
対処：1.0.2.1, 1.66, 1.8.7, 1.0.1.1 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
org.bouncycastle:bc-fips Maven	`< 1.0.2.1`	`1.0.2.1`
org.bouncycastle:bcprov-ext-jdk15on Maven	`< 1.66`	`1.66`
org.bouncycastle:bcprov-ext-jdk16 Maven	`< 1.66`	`1.66`
org.bouncycastle:bcprov-jdk14 Maven	`< 1.66`	`1.66`
org.bouncycastle:bcprov-jdk15 Maven	`< 1.66`	`1.66`
org.bouncycastle:bcprov-jdk15on Maven	`< 1.66`	`1.66`
org.bouncycastle:bcprov-jdk15to18 Maven	`< 1.66`	`1.66`
org.bouncycastle:bcprov-jdk16 Maven	`< 1.66`	`1.66`
BouncyCastle NuGet	`< 1.8.7`	`1.8.7`
bc-csharp bouncycastle	`< 1.8.7`	`1.8.7`
bouncy castle fips .net api bouncycastle	`< 1.0.1.1`	`1.0.1.1`
fips java api bouncycastle	`≥ 1.0.2, < 1.0.2.1< 1.0.1.2`	`1.0.2.11.0.1.2`
the bouncy castle crypto package for java bouncycastle	`< 1.66`	`1.66`

概要

Bouncy Castle BC Java before 1.66, BC C# .NET before 1.8.7, BC-FJA before 1.0.2.1, BC before 1.66, BC-FNA before 1.0.1.1 have a timing issue within the EC math library that can expose information about the private key when an attacker is able to observe timing information for the generation of multiple deterministic ECDSA signatures.

NVD の説明

Bouncy Castle BC Java before 1.66, BC C# .NET before 1.8.7, BC-FJA before 1.0.1.2, 1.0.2.1, and BC-FNA before 1.0.1.1 have a timing issue within the EC math library that can expose information about the private key when an attacker is able to observe timing information for the generation of multiple deterministic ECDSA signatures.