Sakai kernel-impl: predictable PRNG used to generate server‑side encryption key in EncryptionUtilityServiceImpl

中 5.9CVE-2025-62710 · GHSA-gr7h-xw4f-wh86 · 22/10/2025 公開 · 08/10/2026 更新

要点

CVE-2025-62710 は org.sakaiproject.kernel:sakai-kernel-impl, sakai (sakailms) 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）：0.20%（全脆弱性の 9.9% より高い）。
対処：23.5 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.sakaiproject.kernel:sakai-kernel-impl Maven	`≤ 23.3`	修正版なし
sakai sakailms	`< 23.5`	`23.5`

概要

Impact

EncryptionUtilityServiceImpl initialized an AES256TextEncryptor password (serverSecretKey) using RandomStringUtils with the default java.util.Random. java.util.Random is a non‑cryptographic PRNG and can be predicted from limited state/seed information (e.g., start time window), substantially reducing the effective search space of the generated key. An attacker who can obtain ciphertexts (e.g., exported or at‑rest strings protected by this service) and approximate the PRNG seed can feasibly reconstruct the serverSecretKey and decrypt affected data.

Patches

SAK-49866 is patched in Sakai 23.5, 25.0, and trunk.

Credits

Reported by Suraj Gangwar.
Patched by Sam Ottenhoff (Longsight).

NVD の説明

Sakai is a Collaboration and Learning Environment. Prior to versions 23.5 and 25.0, EncryptionUtilityServiceImpl initialized an AES256TextEncryptor password (serverSecretKey) using RandomStringUtils with the default java.util.Random. java.util.Random is a non‑cryptographic PRNG and can be predicted from limited state/seed information (e.g., start time window), substantially reducing the effective search space of the generated key. An attacker who can obtain ciphertexts (e.g., exported or at‑rest strings protected by this service) and approximate the PRNG seed can feasibly reconstruct the serverSecretKey and decrypt affected data. SAK-49866 is patched in Sakai 23.5, 25.0, and trunk.